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PASAR! Description: Must study Author:
Creation Date: 14/01/2025 Category: Others Number of questions: 304 |
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Some electric motors have two sets of field windings wound in opposite directions so that the Motor can be operated in neither direction A shorted armature High starting torque. One purpose of a growler test is to determine the presence of Low spring tension A shorted armature Depends on the load carried by the generator. Electric wire terminals for most aircraft applications must be what type? Screw Round Ring. What is the principal advantage of the series-wound dc motor? High starting torque Low starting torque Mid starting torque. If a generator is equipped with a vibrator-type voltage regulator, the actual time the voltage regulator Depends on the load carried by the generator Frequency and voltage must be both equa Heavy on the load carried by the generator. What is a cause of generator brush arcing? Low spring tension High spring tension Mid spring tension. When ac generators are operated in parallel, the Frequency and voltage must be both equal Frequency and voltage must not be both equal Frequency must be higher. The starting current of a series-wound dc motor, in passing through both the field and armature windings, produces a High starting torque Low starting torque Mid starting torque. Which motor would be most likely to have an armature brake? Landing light retraction motor Interpoles Frequency and voltage must be both equal. The method most often used in overcoming the effect of armature reaction is through the use of Interpoles Field assembly Landing light retraction motor. The only practical method of maintaining a constant voltage output from an aircraft generator under varying conditions of speed and load is to vary the Strength of the magnetic field Length of the magnetic field Weakness of the magnetic field. The pole pieces or shoes used in a dc generator are a part of the Field assembly The brush pigtail Series wound. How many cycles of ac voltage are produced in a six-pole alternator of the revolving-field type for each revolution of the rotor? Three Two One. If the reverse current cutout relay contact points fail to open after the generator output has dropped below battery potential, current will flow through the generator armature Opposite to the normal direction and through the shunt field in the normal direction Not Opposite to the normal direction and through the shunt field in the normal direction normal direction and through the shunt field in the shunt field. How does the magnetic brake used to stop rotation of an electric motor armature operate? A friction brake is applied by a spring and release by a magnet A friction brake is not applied by a spring and release by a magnet A friction brake is applied by a magnet and release by a spring. In a generator, what eliminates any possible sparking to the brush guides caused by the movement of the brushes within the holder? The brush pigtail pigtail brush. A series-wound dc electric motor will normally require More current at low rpm than at high rpm More current at high rpm than at low rpm. The type of electric wire terminals used for most aircraft applications, in addition to providing good current carrying capabilities, are designed primarily To prevent circuit failure due to terminal disconnection Individual strands will break easily after being nicked. The commutator of a generator Changes alternating current produced in the armature into direct current as it is taken from the armature A place armature in a growler and connect a 110v test light on adjacent segments; light should light. Aluminum wire must be stripped very carefully because Individual strands will break easily after being nicked Individual strands will not break easily after being nicked. An ammeter in a battery charging system is for the purpose of indicating the Rate of current used to charge the battery Rate of current is not used to charge the battery. Which of the following is not one of the purposes of interpoles in a generator? Reduce field strength Does not reduce field strength. To test generator or motor armature windings for opens, A place armature in a growler and connect a 110v test light on adjacent segments; light should light A place armature in a growler and connect a 115v test light on adjacent segments; light should light. What is the color and orientation of the position lights for navigation on civil airplanes? Left side – red , right side – green, rear aft – white Left side – white , right side – red, rear aft – green. To what depth is the mica insulation between the commutator bars of a dc generator undercut? Equal to the width of the mica Not equal to the width of the mica. A voltage regulator controls generator output by Varying current flow to generator field coil Not varying current flow to generator field coil. Which type of dc generator is not used as an airplane generator Series wound An integral fan. What does a rectifier do? Changes alternating current to direct current Changes direct current to alternating current. What type of instrument is used for measuring very high values of resistance? Megohmmeter Compass Gauge. When a diode is checked for an open circuit or a short circuit, it should be Disconnected from the circuit connected from the circuit. When handling a high voltage capacitor in an electrical circuit, be sure it It is fully discharge before removing it from the circuit It is fully charge before removing it from the circuit. Which of the following is most likely to cause thermal runaway in a nickel-cadmium battery? Excessive current draw from the battery Not Excessive current draw from the battery. How can it be determined if a transformer winding has some of its turns shorted together? Transformer will get hot in normal operation Transformer will get cold in normal operation. Which of the following are the major parts of a dc motor? 1. Armature assembly. 2. Field assembly. 3. Brush assembly. 4. Commutator. 5. Pole piece. 6. Rheostat. 7. End frame. 1,2,3,7 2,4,5,7 1,3,4,5. (1) There are three basic types of dc motors; series, shunt, and compound. (2) In the series motor, the field windings, consisting of relatively few turns of heavy wire, are connected in series with the armature winding. Regarding the above statements, Both no. 1 and no. 2 are true Both no. 1 and no. 2 are not true no. 1 true no. 2 true. For general electrical use in aircraft, the acceptable method of attaching a terminal to a wire is by Crimping Rivet Wielding. Which of the following factors must be taken into consideration when determining the wire size to use for an aircraft installation? 1. Mechanical strength. 2. Allowable power loss. 3. Ease of installation. 4. Resistance of current return path through the aircraft structure. 5. Permissible voltage drop. 6. Current carrying capability of the conductor. 7. Type of load (continuous or intermittent). 2,5,6,7 1,4,3,5 1,6,74. When selecting hardware for attaching bonding connections to an aircraft structure, which of the following should be considered? 1. Mechanical strength. 2. Allowable power loss. 3. Ease of installation. 4. Permissible voltage drop. 5. Amount of current to be carried. 6. Type of load (continuous or intermittent). 1,3,5 1,2,4 2,5,7 3,4,7. How should the splices be arranged if several are to be located in an electrical wire bundle? Staggered along the length of the bundle Not Staggered along the length of the bundle. What is the minimum bend radius for an electrical wire bundle? Ten times the outside diameter of the bundle Five times the outside diameter of the bundle. When approved, splices may be used to repair manufactured harnesses or installed wiring. The maximum number of splices permitted between any two connectors is one two three. AN/MS electrical connectors are specifically designed to meet Military specification Navy specification Air Force specification. The most common method of attaching a pin or socket to an individual wire in an MS electrical connector is by Crimping Rivet. The pin section of an AN/MS connector is normally installed on The ground side of a circuit The left side of a circuit. The voltage output of an alternator may be regulated by controlling the Voltage output of the dc exciter Voltage output of the dc opener. If several long lengths of electrical cable are to be installed in rigid conduit, the possibility of damage to the cable as it is pulled through the conduit will be reduced by Dusting the cable with powdered soapstone Dusting the cable with powdered soap. Grounding is electrically connecting a conductive object to the primary structure. One purpose of grounding is to Prevent development of radio frequency potentials Prevent development of signal frequency potentials. What is normally used to bond non-continuous stainless steel aircraft components? Copper jumpers Zinc jumpers. Aircraft fuse capacity is rated in Amperes Voltage. When adding a rheostat to a light circuit to control the light intensity, it should be connected in series with the light series with the rays. Circuits that must be operated only in an emergency or whose inadvertent activation could endanger a system frequently employ Guarded switches Not Guarded switches. If one switch is used to control all navigation lights, the lights are most likely connected Parallel to each other and in series with the switch Not Parallel to each other and in series with the switch. Oil canning of the sides of aluminum or steel electrical junction boxes is considered to be A shorting hazard A long hazard. Electric wiring installed in aircraft without special enclosing means (open wiring) offers the advantages of ease of installation, simple maintenance, and reduced weight. When bundling open wiring, the bundles should Be limited as to the number of cables to minimize damage from a single electrical fault Not limited as to the number of cables to minimize damage from a single electrical fault. During inspection of the terminal strips of an aircraft electrical system, it should be determined that The terminal studs are anchored against rotation The terminal studs are anchored not against rotation. What protection to wires and cables does conduit provide when used in aircraft installations? Mechanical Not Mechanical. Which of the following should be accomplished in the installation of aircraft wiring? Locate the bundle above flammable fluid lines and securely clamp to structure Locate the bundle below flammable fluid lines and securely clamp to structure. If the (+) terminal of a voltmeter is connected to the (-) terminal of the source voltage and the (-) terminal of the meter is connected to the (+) terminal of the source voltage, the voltmeter will read Backwards Onwards. When using the voltage drop method of checking circuit resistance, the Input voltage must be maintained at a constant value Input voltage must be not maintained at a constant value. The nominal rating of electrical switches refers to continuous Current rating with contacts closed Current rating with contacts open. Aircraft electrical junction boxes located in a fire zone are usually constructed of Stainless steel Aluminum . To help minimize radio interference, a capacitor will largely eliminate and provide a steady direct current if the capacitor is connected to the generator in Parallel Perpendicular. The primary considerations when selecting electric cable size are Current carrying capacity and allowable voltage drop Current carrying capacity and not allowable voltage drop. The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an ON position and an OFF position, with no additional positions possible. This switch is referred to as a Single pole single throw (SPST), two position switch Single pole single throw (SPST), one position switch. Electric circuits are protected from overheating by means of Fuses Not Fuses. How does the routing of coaxial cables differ from the routing of electrical wiring? Coaxial cable are routed as directly as possible Coaxial cable are routed as not directly as possible. Which of the following copper electrical cable sizes should be selected to replace a No. 6 aluminum electrical cable? No. 6 No. 5 . In installations where the ammeter is in the generator or alternator lead, and the regulator system does not limit the maximum current that the generator or alternator can deliver, the ammeter can be redlined at what percent of the generator or alternator rating? 100 1000 50. Which statement relating to electric wiring is true? When attaching a terminal to the end of an electric cable , it should be determined that the strength of the cable to terminal joint is at least equal to the tensile strength of the cable itself When attaching a terminal to the end of an electric cable , it should be determined that the strength of the cable to terminal joint is at least NOT equal to the tensile strength of the cable itself. Bonding connections should be tested for Resistance value In parallel with the load. A circuit protection device called a current limiter is essentially a slow-blow fuse and is designed to be used in Heavy power circuits Light power circuits. If it is necessary to use an electrical connector where it may be exposed to moisture, the mechanic should Use a special moisture proof type Use a normal moisture proof type. The three kinds of circuit-protection devices used most commonly in aircraft circuits are Circuit breakers, fuses, and current limiters Parallel breakers, fuses, and current limiters. If a wire is installed so that it comes in contact with some moving parts, what protection should be given the wire? Pass through conduit Do not pass through conduit. In the American Wire Gauge (AWG) system of numbers used to designate electrical wire sizes, the number assigned to a size is related to its Cross sectional area Straight sectional area. What is the voltage drop for a No. 18 copper wire 50 feet long to carry 12.5 amperes, continuous operation? Use the formula VD = RLA / VD = Voltage drop / R = Resistance per ft = .00644 / L = Length of wires A = Amperes 4v 5v 7v. What is the purpose of the selection of derated switches for known continuous load current applications? To obtain reasonable switch efficiency and service life To not obtain reasonable switch efficiency and service life. What is the advantage of a circuit breaker when compared to a fuse? Not Resettable and not reusable Resettable and reusable. What is the advantage of a current limiter? it will take overload for a short period it will take overload for a long period. Where electric cables must pass through holes in bulkheads, formers, ribs, firewalls, etc., the wires should be protected from chafing by Using a suitable grommet Not Using a suitable grommet. in aircraft electrical systems, automatic reset circuit breakers Should not be used as protective devices Should be used as protective devices. A certain switch is described as a single-pole, double-throw switch (SPDT). The throw of a switch indicates the number of Circuits each pole can complete through the switch Circuits each pole can't complete through the switch. When considering an alteration, the criteria upon which the selection of electric cable size should be based are Current carrying and allowable voltage drop Current carrying and not allowable voltage drop. What is an important factor in selecting aircraft fuses? Capacity matches the needs of the circuit Capacity does not matches the needs of the circuit. The circuit breaker in the instrument lighting system protects the Wiring from too much current Wiring from allowable current. One advantage of using ac electrical power in aircraft is Greater ease in stepping the voltage up or down Greater ease in stepping the ampere up or down. Why are the iron cores of most induction coils laminated? To reduce the effects of eddy currents To not reduce the effects of eddy currents. Certain transport aircraft use ac electrical power for all normal operation and battery furnished dc electrical power for standby emergency use. In aircraft of this type that operate no dc generators, the batteries are kept charged by Rectifiers which use the aircraft’s ac generator as a source of power Rectifiers which use the aircraft’s engine as a source of power. the voltage in an ac transformer secondary that contains twice as many loops as the primary will be Greater and the amperage less than in the primary Lesser and the amperage greater than in the primary. If the positive field lead between a generator and a generator control panel breaks and is shorted while the engine is running, a voltmeter connected to generator output would indicate Residual voltage Residual ampere. What is a method used for restoring generator field residual magnetism? Flash the fields Residual voltage. The major advantages of alternating current (AC) over direct current (DC) is the fact that its current and voltage can easily be increased or decreased By means of a transformer By means of a engine. Which of the following must be accomplished when installing an anticollision light? Install a switch independent of the position light switch Install a switch dependent of the position light switch. The inductor-type inverter output voltage is controlled by the Dc stator field current Dc stator field voltage. When using an ohmmeter to check the continuity of a generator field coil, the coil should Show very low resistance if it is a series field coil Show very high resistance if it is a series field coil. The strength of the core of an electromagnet depends upon the material from which it is constructed and which of the following? the number of turns of wire in the coil and the amount of current (ampere) passing through the coil the number of turns of wire in the coil and the amount of current (voltage) passing through the coil. A voltage regulator controls generator voltage by changing the Resistance of the generator field circuit Resistance of the generator field parallel. The overvoltage control automatically protects the generator system when excessive voltage is present by Opening the shunt field circuit Closing the shunt field circuit. When dc generators are operated in parallel to supply power for a single load, their controls include an equalizer circuit to assure that all generators share the load equally. The equalizer circuit operates by Increasing the output of the low generator and decreasing the output of the high generator until they are equal Decreasing the output of the low generator and decreasing the output of the high generator until they are equal. What is the maximum amount of time a circuit can be in operation and still be an intermittent duty circuit? Two minutes Three minutes Four minutes. the most common method of regulating the voltage output of a compound dc generator is to vary the ans. Current flowing through the shunt field coils (Refer to Figure 18.) Which of the batteries are connected together incorrectly? 3 2 1. Refer to Figure 19.) Upon completion of the landing gear extension cycle, the green light illuminated and the red light remained lit. What is the probable cause? Short in the up limit switch Long in the up limit switch. if any one generator in a 24-volt dc system shows low voltage, the most likely cause is An out of adjustment voltage regulator An in of adjustment voltage regulator. How can the direction of rotation of a dc electric motor be changed? Reverse the electrical connections to either the field or armature windings Reverse the mechanical connections to either the field or armature windings. Aircraft which operate only ac generators (alternators) as a primary source of electrical power normally provide current suitable for battery charging through the use of A step down transformer and a rectifier A step up transformer and a rectifier. During inspection of an anti-collision light installation for condition and proper operation, it should be determined that The anti-collision light can be operated independently of the position lights The anti-collision light can be operated dependently of the position lights. Major adjustments on equipment such as regulators, contactors, and inverters are best accomplished outside the airplane on test benches with necessary instruments and equipment. Adjustment procedure should be as outlined by The equipment manufacturer The manufacturer. A battery-generator system provides direct current. On installations requiring alternating current from the battery-generator system, it is necessary to have An inverter Magnetically operated switch. A relay is Magnetically operated switch Not Magnetically operated switch. The purpose of a rectifier in an electrical system is to change Alternating current to direct current Direct current to alternating current. What is the ratio of turns between the primary coil winding and the secondary coil winding of a transformer designed to triple its input voltage? Primary will have one third as many turns as its secondary Secondary will have one third as many turns as its primary. In an ac circuit with no phase lead or lag, which is true? Real power equals apparent power Apparent powers equals real powers. How are generators rated? Amperes and rated voltage Rated voltage and amperes. How is a shunt-wound dc generator connected? Both fields are shunted across the armature Not both fields are shunted across the armature. The poles of a generator are laminated to Reduce by eddy current losses does not reduce by eddy current losses. What is the frequency of an alternator dependent upon? Rpm Guage . The generator rating is usually found stamped on the Generator Engine. Residual voltage is a result of magnetism in the Field shoes Oil spray. In troubleshooting an electrical circuit, if an ohmmeter is properly connected across a circuit component and some value of resistance is read, The component has continuity and is not open The component has continuity and is open. CSD driven generators are usually cooled by Oil spray Gasoline spray. A CSD unit drives a generator through the use of A variable hydraulic pump and hydraulic motor A variable hydraulic pump and non hydraulic motor. Integrated drive generators (IDG) employ a type of high output ac generator that utilizes A brushless system to produce current A brush system to produce current. If the IDG scavenge oil filter is contaminated with chunks or pieces of metal Remove and replace the IDG Does not remove and replace the IDG. When necessary during operation, CSD disconnect is usually accomplished by A switch in the cockpit A gauge in the cockpit. A CSD unit that is disconnected in flight, due to a malfunction such as overtemperature, may be reconnected Only on the ground by maintenance personnel Only on the air by maintenance personnel. If registration numbers are tso be applied to an aircraft with a letter height of 12 inches, what is the minimum space required for the registration mark N1683C? Note: 2/3 x height = character width. 1/6 x height = width for 1. 1/4 x 2/3 height = spacing. 1/6 x height = stroke or line width 52 inches 62 inches 42 inches. If masking tape is applied to an aircraft such as for trim spraying, and is left on for several days and/or exposed to heat, it is likely that the tape will Cure to the finish and be very difficult to remove Cure to the finish and be very easy to remove. What is used to slow the drying time of some finishes and to prevent blush? Retarder Wash primer. Which properly applied finish topcoat is the most durable and chemical resistant? Polyurethane Wash primer. Aluminum-pigment in dope is used primarily to Exclude sunlight from the fabric Include sunlight from the fabric. A correct use for acetone is to Remove grease from the fabric Does not remove grease from the fabric. Which of the following is a hazard associated with sanding on fabric covered surfaces during the finishing process? Static electricity buildup Kinetic electricity buildup. What is likely to occur if unhydrated wash primer is applied to unpainted aluminum and then about 30 to 40 minutes later a finish topcoat, when the humidity is low? Corrosion Stress. Fungicidal dopes are used in aircraft finishing as the First coat to prevent rotting and are applied thin enough to saturate the fabric Second coat to prevent rotting and are applied thin enough to saturate the fabric. Before applying a protective coating to any unpainted clean aluminum, you should Avoid touching the surface with bare hands touching the surface with bare hands. What is likely to occur if hydrated wash primer is applied to unpainted aluminum and then about 30 to 40 minutes later a finish topcoat, when the humidity is low? A glossy, blush free finish A matte, blush free finish. What is the usual cause of runs and sags in aircraft finishes? too much material applied in one coat too much material applied in two coat. Which defect in aircraft finishes may be caused by adverse humidity, drafts, or sudden changes in temperature? Blushing Brushing. Which statement is true regarding paint system compatibility? Old wash primer may be over coated directly with epoxy finishes New wash primer may be over coated directly with epoxy finishe. Frequently, an aircraft's auxiliary power unit (APU) generator Is identical to engine driven generators Is not identical to engine driven generators. Fuel is normally supplied to an APU from The airplanes main fuel supply The airplanes second main fuel supply. An APU is usually rotated during start by Electric starter Mechanical starter. The function of an APU air inlet plenum is to Stabilize the pressure of the air before it enters the compressor Does not stabilize the pressure of the air before it enters the compressor. When in operation, the speed of an APU Remains at or near rated speed regardless of the load condition Remains at or far rated speed regardless of the load condition. Generally, when maximum APU shaft output power is being used in conjunction with pneumatic power Pneumatic loading will be automatically modulated to maintain a safe EGT. Pneumatic loading will be automatically modulated to not maintain a safe EGT. When necessary, APU engine cooling before shutdown may be accomplished by Closing the bleed air valves Opening the bleed air valves. Fuel scheduling during APU start and under varying pneumatic bleed and electrical loads is maintained Automatically by the APU fuel control system Manually by the APU fuel control syst. On APU's equipped with a free turbine and load compressor, the primary function of the load compressor is to Provide bleed air for aircraft pneumatic systems Does not provide bleed air for aircraft pneumatic systems. An aircraft magnetic compass is swung to up-date the compass correction card when Equipment is added that could effect compass deviation Lubber line. The operating mechanism of most hydraulic pressure gauges is Bourdon tube Lubber line. 1) Aircraft instruments are color-coded to direct attention to operational ranges and limitations. (2) Aircraft instruments range markings are not specified by Title 14 of the Code of Federal Regulations but are standardized by aircraft manufacturers. Only 1 is true Only 2 is true. When swinging a magnetic compass, the compensators are adjusted to correct for Magnetic influence deviation Pressure altitude. What will be the result if the instrument static pressure line becomes disconnected inside a pressurized cabin during cruising flight? The altimeter and airspeed indicator will both read low The altimeter and airspeed indicator will both read high. The maximum deviation (during level flight) permitted in a compensated magnetic direction indicator installed on an aircraft certificated under Federal Aviation Regulation Part 23 is 10 degrees 15 degrees. Magnetic compass bowls are filled with a liquid to Dampen the oscillation of the float The altimeter and airspeed indicator will both read low. Instrument static system leakage can be detected by observing the rate of change in indication of the Altimeter after suction has been applied to the static system to cause a prescribe equivalent altitude to be indicated The altimeter and airspeed indicator will both read low. The maximum altitude loss permitted during an unpressurized aircraft instrument static pressure system integrity check is 100 feet in 1 minute 100 feet in 2 minutes. Which statement regarding an aircraft instrument vacuum system is true? Dry type vacuum pump with carbon vanes are very susceptible to damage from solid airborne particles and must take in only filtered air Altimeter after suction has been applied to the static system to cause a prescribe equivalent altitude to be indicated. Which of the following instrument discrepancies could be corrected by an aviation mechanic? 1. Red line missing. 2. Case leaking. 3. Glass cracked. 4. Mounting screws loose. 5. Case paint chipped. 6. Leaking at line B nut. 7. Will not adjust 8. Fogged 1,4,5,6 2,3,4,5. Which of the following instrument discrepancies would require replacement of the instrument? 1. Red line missing. 2. Case leaking. 3. Glass cracked. 4. Mounting screws loose. 5. Case paint chipped. 6. Leaking at line B nut. 7. Will not zero out 8. Fogged 2,3,7,8 3,5,6,7. Which of the following instrument conditions is acceptable and would not require correction? 1. Red line missing. 2. Case leaking. 3. Glass cracked. 4. Mounting screws loose. 5. Case paint chipped. 6. Leaking at line B nut. 7. Will not zero out. 8. Fogged 5 3. A barometric altimeter indicates pressure altitude when the barometric scale is set at 29.92” hg 30 hg. A Bourdon tube instrument may be used to indicate 1. pressure. 2. temperature. 3. position 1 and 2 2 and 3. A turn coordinator instrument indicates Both roll and yaw roll yaw. Thermocouple leads Are designed for specific installation and may not be altered Electrically with wires. A synchro transmitter is connected to a synchro receiver Electrically with wires Not parallel to the true angle of attack of the aircraft. The operation of an angle-of-attack indicating system is based on detection of differential pressure at a point where the airstream flows in a direction Not parallel to the true angle of attack of the aircraft Chromel/alumel thermocouples. Turbine engine exhaust gas temperatures are measured by using Chromel/alumel thermocouples Electrically. Fuel flow transmitters are designed to transmit data Electrically Mechanical. Which of the following causes of aircraft magnetic compass inaccuracies may be compensated for by mechanics? Deviation Abbreviation . Who is authorized to repair an aircraft instrument? 1. A certified mechanic with an airframe rating. 2. A certificated repairman with an airframe rating. 3. A certificated repair station approved for that class instrument. 4. A certificated airframe repair station. 3 2. What does a reciprocating engine manifold pressure gauge indicate when the engine is not operating? The existing atmospheric pressure The existing atmospheric density. The requirements for testing and inspection of instrument static systems required by Section 91.411 are contained in PART 43, APPENDIX E PART 45, APPENDIX E. Which condition would be most likely to cause excessive vacuum in a vacuum system? Vacuum relief valve improperly adjusted Display alphanumeric data and representations of aircraft instruments. Data transmitted between components in an EFIS are converted into Digital signal Transmitting. The function of a CRT in an EFIS is to Display alphanumeric data and representations of aircraft instruments Transmitting a signal and receiving bask a reflected signal. The function of a symbol generator (SG) in an EFIS is to Receive the process input signals from aircraft and engine sensors and send the data to the appropriate display Allow the pilot to select the appropriate system configuration for the current flight situation. A radar altimeter determines altitude by Transmitting a signal and receiving bask a reflected signal Altitude above ground level. Resistance-type temperature indicators using Wheatstone bridge or ratiometer circuits may be used to indicate the temperatures of which of the following? 1. Free air. 2. Exhaust gas temperature. 3. Carburetor air. 4. Coolant (engine). 5. Oil temperature. 6. Cylinder head temperature. 1,3,4 and 5 2,4,6 and 5. When flags such as NAV, HDG, or GS are displayed on an HSI, the indication is That function is inoperative That function is operative. Instrument panel shock mounts absorb Low frequency ,high amplitude shocks high amplitude shocks, Low frequency . Which procedure should you use if you find a vacuum-operated instrument glass loose? Install another instrument Do not Install another instrument. Which instruments are connected to an aircraft's pitot-static system? 1. Vertical speed indicator. 2. Cabin altimeter. 3. Altimeter. 4. Cabin rate-of-change indicator. 5. Airspeed indicator. 1,3 and 5 2,4 and 5. How many of the following instruments will normally have range markings? 1. Airspeed indicator. 2. Altimeter. 3. Cylinder head temperature gauge two one. How would an airspeed indicator be marked to show the best rate-of-climb speed (one engine inoperative)? Blue radial line Red radial line. The green arc on an aircraft temperature gauge indicates Desirable temperature range Not Desirable temperature range. What must be done to an instrument panel that is supported by shock mounts? Bonding straps must be install across the instrument mounts as a current path Bonding straps must not be install across the instrument mounts as a current path. What marking color is used to indicate if a cover glass has slipped? white blue. Aircraft instruments should be marked and graduated in accordance with The specific aircraft maintenance or flight manual The specific aircraft maintenance or manual. Aircraft instrument panels are generally shock-mounted to absorb Low frequency, high amplitude shocks high amplitude shocks, Low frequency. The method of mounting aircraft instruments in their respective panels depends on the Design of the instrument case Iron or steel cases. How is a flangeless instrument case mounted in an instrument panel? By an expanding type clamp secured to the back of the panel and tightened by a screw from the front of the panel By an expanding type clamp secured to the back of the panel and tightened by a screw from the back of the panel. Cases for electrically operated instruments are made of Iron or steel cases steel cases or iron. When installing an instrument in an aircraft, who is responsible for making sure it is properly marked? Instrument installer Instrument not installer. Where may a person look for the information necessary to determine the required markings on an engine instrument? 1. Engine manufacturer's specifications. 2. Aircraft flight manual. 3. Instrument manufacturer's specifications. 4. Aircraft maintenance manual. 2 or 4 1 or 4. A certificated mechanic with airframe and powerplant ratings may Not perform repairs to aircraft instruments perform repairs to aircraft instruments. The red radial lines on the face of an engine oil pressure gauge indicates Minimum or maximum safe operating limits maximum or minimum safe operating limits. A certificated mechanic may perform 100 hour inspection of instruments 50 hour inspection of instruments. An aircraft instrument panel is electrically bonded to the aircraft structure to Provide current return paths Do not Provide current return paths. ow many of the following are controlled by gyroscopes? 1. Attitude indicator. 2. Heading indicator. 3. Turn needle of the turn-and-slip indicator. Three Two. The lubber line on a directional gyro is used to Represents the nose of the aircraft Do not Represents the nose of the aircraft. Which instruments are connected to an aircraft's static pressure system only? 1. Vertical speed indicator. 2. Cabin altimeter. 3. Altimeter. 4. Cabin rate-of-change indicator. 5. Airspeed indicator. 1 and 3 2 and 5. When an unpressurized aircraft's static pressure system is leak checked to comply with the requirements of Section 91.411, what aircraft instrument may be used in lieu of a pitot-static system tester? 1. Vertical speed indicator. 2. Cabin altimeter. 3. Altimeter. 4. Cabin rate-of-change indicator. 5. Airspeed indicator. 3 2. if a static pressure system check reveals excessive leakage, the leak(s) may be located by ans. Isolating portions of the line and testing each portion systematically starting at the instrument connections When performing the static system leakage check required by Section 91.411, the technician utilizes Negative pressure Positive pressure. What device is used to convert alternating current, which has been induced into the loops of the rotating armature of a dc generator, to direct current? A commutator Hertz output. What device is used to convert alternating current, which has been induced into the loops of the rotating armature of a dc generator, to direct current? The condition is normal for this type of motor The condition is not normal for this type of motor. The stationary field strength in a direct current generator is varied Direct current , series wound motor Not Direct current , series wound motor. Upon what does the output frequency of an ac generator (alternator) depend? The speed of rotation and the number of field poles Not the speed of rotation and the number of field poles. A high surge of current is required when a dc electric motor is first started. As the speed of the motor increases, The current EMF builds up and opposes the applied EMF, thus reducing the current flow through the armature The current EMF builds up and does not oppose the applied EMF, thus reducing the current flow through the armature. Alternators (ac generators) that are driven by a constant-speed drive (CSD) mechanism are used to regulate the alternator to a constant Hertz output Hertz input. What is used to polish commutators or slip rings? A very fine sand paper A not very fine sand paper. If a generator is malfunctioning, its voltage can be reduced to residual by actuating the Generator master switch Generator switch. If the points in a vibrator-type voltage regulator stick in the closed position while the generator is operating, what will be the probable result? Generator output voltage will increase Generator output voltage will decrease. Why is a constant-speed drive used to control the speed of some aircraft engine-driven generators? So that the frequency of the alternating current output will remain constant So that the frequency of the alternating current output will not remain constant. According to the electron theory of the flow of electricity, when a properly functioning dc alternator and voltage regulating system is charging an aircraft's battery, the direction of current flow through the battery As in to negative terminal and out the positive terminal As in to positive terminal and out the positive terminal. Aircraft that operate more than one generator connected to a common electrical system must be provided with Individual generator switches that can be operated from the cockpit during flight All generator switches that can be operated from the cockpit during flight. The most effective method of regulating aircraft direct current generator output is to vary, according to the load requirements, the Strength of the stationary field Weakness of the stationary field. Electric motors are often classified according to the method of connecting the field coils and armature. Aircraft engine starter motors are generally of which type? Series voltage. As the generator load is increased (within its rated capacity), the voltage will Remain constant and the amperage of the output will increase It will not remain constant and the amperage of the output will increase. As the flux density in the field of a dc generator increases and the current flow to the system increases, the The force require to turn the generator increase The mass require to turn the generator increase. What is the purpose of a reverse-current cutout relay It opens the main generator circuit whenever the generator voltage drops below the battery voltage It closes the main generator circuit whenever the generator voltage drops below the battery voltage. Generator voltage will not build up when the field is flashed and solder is found on the brush cover plate. These are most likely indications of Open armature Close armature. Why is it unnecessary to flash the field of the exciter on a brushless alternator? Permanent magnets are installed in the main field poles Not Permanent magnets are installed in the main field poles. One way that the automatic ignition relight systems are activated on gas turbine engines is by a Drop in compressor discharge pressure Do not drop in compressor discharge pressure. How are the rotor windings of an aircraft alternator usually excited? By a variable direct current By a variable not direct current. What precaution is usually taken to prevent electrolyte from freezing in a lead acid battery? Keep battery fully charged Not keep battery fully charged. What is the ampere-hour rating of a storage battery that is designed to deliver 45 amperes for 2.5 hours? 112 amperes per hour 121 amperes per hour. How many hours will a 140 ampere-hour battery deliver 15 amperes? 9.33 hours 10 hours. What is a basic advantage of using ac for electrical power for a large aircraft AC system operates at a HIGHER voltage than dc systems and therefore use less current and can use smaller and lighter weight wiring AC system operates at a LOWER voltage than dc systems and therefore use less current and can use smaller and lighter weight wiring. What are two types of ac motors that are used to produce a relatively high torque? Three phase induction and capacitor start Six phase induction and capacitor start. (1) Alternators are rated in volt-amps, which is a measure of the apparent power being produced by the generator. (2) Alternating current has the advantage over direct current in that its voltage and current can easily be stepped up or down. no.1 and 2 are true no.1 and 2 are not true. What is the frequency of most aircraft alternating current? 400 hertz 500 hertz. The reason for flashing the field in a generator is to Restore the polarity and/or residual magnetism to the field poles Not restore the polarity and/or residual magnetism to the field poles. The part of a dc alternator power system that prevents reverse flow of current from the battery to the alternator is the Rectifier Alternator. The generating system of an aircraft charges the battery by using Constant voltage and varying current varying current and Constant voltage . The constant current method of charging a ni-cad battery Is the method maintaining cell balance Is the method not maintaining cell balance. Refer to Figure 4.) The following data concerning the installation of an electrical unit is known: current requirements for continuous operation -- 11 amperes; measured cable length -- 45 feet; system voltage -- 28 volts (do not exceed 1 volt drop); cable in conduit and bundles. What is the minimum size copper electrical cable that may be selected? no.12 no.14. Which of the following aircraft circuits does NOT contain a fuse/circuit breaker? Starter circuit End circuit. The maximum number of terminals that may be connected to any one terminal stud in an aircraft electrical system is 4 2. What is the maximum number of bonding jumper wires that may be attached to one terminal grounded to a flat surface? four three. As a general rule, starter brushes are replaced when they are approximatel One half their original length One forth their original length. When installing an electrical switch, under which of the following conditions should the switch be derated from its nominal current rating? Direct current motor circuit Not Direct current motor circuit. The resistance of the current return path through the aircraft is always considered negligible, provided the Structure is adequately bonded Structure is adequately not bonded. In order to reduce the possibility of ground shorting the circuits when the connectors are separated for maintenance, the AN and MS electrical connectors should be installed with the Pin section on the ground side of the electrical circuit Pin section on the ground side of the mechanical circuit. When does current flow through the coil of a solenoid-operated electrical switch? Continually as long as the control circuit is complete Do not continually as long as the control circuit is complete. When a 28 volt, 75 ampere generator is installed on an aircraft, an electrical load analysis ground check is performed and it is determined that the battery is furnishing 57 amperes to the system, with all electrical equipment operating. This indicates The load will be within generator load limit The load will be not within generator load limit. What type of lubricant may be used to aid in pulling electrical wires or cables through conduits? Soapstone talc Soap talc. Which of the following is regulated in a generator to control its voltage output? The strength of the field The weakness of the field. Bonding jumpers should be designed and installed in such a manner that they Provide a low resistance in the ground circuit Do not provide a low resistance in the ground circuit. When the starter switch to the aircraft gas turbine engine starter-generator is energized and the engine fails to rotate, one of the probable causes would be the Starter solenoid is defective Starter solenoid is not defective. Arcing at the brushes and burning of the commutator of a motor may be caused by Weak brush spring brush spring. The maximum allowable voltage drop between the generator and the bus bar is 2 percent of regulated voltage 6 percent of regulated voltage. ON-OFF two position engine electrical switches should be installed So the on position is reached by a forward or upward motion So the off position is reached by a forward or upward motion. When selecting an electrical switch for installation in an aircraft circuit utilizing a direct current motor, a derating factor should be applied a derating factor should not be applied. When installing electrical wiring parallel to a fuel line, the wiring should be Above the fuel line below the fuel line. What speed must an eight-pole ac generator turn to produce 400-Hertz ac? 6000 rpm 7000 rpm. How many basic types of circuit breakers are used in powerplant installation electrical systems? Three Five. Which Federal Aviation Regulation specifies that each resettable circuit protective device requires a manual operation to restore service after the device has interrupted the circuit? 14 CFR part 23 14 CFR part 25. Which Federal Aviation Regulation requirement prevents the use of automatic reset circuit breakers? 14 CFR part 23 14 CFR part 25. The time/current capacities of a circuit breaker or fuse must be Below those of the associated conductor not below those of the associated conductor. (1) Most modern aircraft use circuit breakers rather than fuses to protect their electrical circuits. (2) Federal Aviation Regulations Part 23 requires that all electrical circuits incorporate some form of circuit protective device. Regarding the above statements, Only 1 is true Only 2 is true. Electrical switches are rated according to the Voltage and current they can control Voltage and current they can not control. Electrical circuit protection devices are installed primarily to protect the Wiring rivet. (1) Electrical circuit protection devices are rated based on the amount of current that can be carried without overheating the wiring insulation. (2) A 'trip-free' circuit breaker makes it impossible to manually hold the circuit closed when excessive current is flowing. Regarding the above statements, Both no. 1 and no. 2 is true Both no. 1 and no. 2 is not true. Which of the following Federal Aviation Regulations require that all aircraft using fuses as the circuit protective devices carry 'one spare set of fuses, or three spare fuses of each kind required'? 14 CFR part 91 14 CFR part 95. What is the smallest terminal stud allowed for aircraft electrical power systems? No. 10 No. 15. A typical barrier type aircraft terminal strip is made of Paper base phenolic compound not Paper base phenolic compound. A term commonly used when two or more electrical terminals are installed on a single lug of a terminal strip is stacking magnet. 1) Electrical wires larger than 10 gauge use uninsulated terminals. (2) Electrical wires smaller than 10 gauge use uninsulated terminals. Regarding the above statements, Only 1 is true Only 2 is true. Aircraft electrical wire size is measured according to the American wire gauge system African wire gauge system. Aircraft copper electrical wire is coated with tin, silver, or nickel in order to Prevent oxidation do not Prevent oxidation. Which coupling nut should be selected for use with 1/2-inch aluminum oil lines which are to be assembled using flared tube ends and standard AN nuts, sleeves, and fittings? AN-818-8 round type. Metal tubing fluid lines are sized by wall thickness and Outside diameter in 1/16 inch incriments Outside diameter in 1/12 inch incriments. From the following sequences of steps, indicate the proper order you would use to make a single flare on a piece of tubing: 1. Place the tube in the proper size hole in the flaring block. 2. Project the end of the tube slightly from the top of the flaring tool, about the thickness of a dime. 3. Slip the fitting nut and sleeve on the tube. 4. Strike the plunger several light blows with a lightweight hammer or mallet and turn the plunger one- half turn after each blow. 5. Tighten the clamp bar securely to prevent slippage. 6. Center the plunger or flaring pin over the tube. 3,1,6,2,5,4 1,4,3,5,2,6. Hydraulic tubing, which is damaged in a localized area to such an extent that repair is necessary, may be repaired By cutting out the damaged area and utilizing a swaged tube fitting to join the tube ends By not cutting out the damaged area and utilizing a swaged tube fitting to join the tube ends. What is an advantage of a double flare on aluminum tubing? More resistant to damage when the joint is tightened less resistant to damage when the joint is tightened. A certain amount of slack must be left in a flexible hose during installation because, when under pressure, i Contracts in length and expands in diameter Contracts in length and expands in radius. The term 'cold flow' is generally associated with Impression left in natural or synthetic rubber hose material Impress left in natural or synthetic rubber hose material. What is the color of an AN steel flared-tube fitting? Black White. Which of the following statements is/are correct in reference to flare fittings? 1. AN fittings have an identifying shoulder between the end of the threads and the flare cone. 2. AC and AN fittings are considered identical except for material composition and identifying colors. 3. AN fittings are generally interchangeable with AC fittings of compatible material composition. 1 2. Flexible lines must be installed with A slack of 5 to 8 percent of the lengt A slack of 5 to 9 percent of the length. The maximum distance between end fittings to which a straight hose assembly is to be connected is 50 inches. The minimum hose length to make such a connection should be 52 ½ inches 55 ½ inches. Excessive stress on fluid or pneumatic metal tubing caused by expansion and contraction due to temperature changes can best be avoided by Providing bends in the tubing not Providing bends in the tubing. The material specifications for a certain aircraft require that a replacement oil line be fabricated from 3/4-inch 0.072 5052-0 aluminum alloy tubing. What is the inside dimension of this tubing? 0.606 inch 0.610 inch. in most aircraft hydraulic systems, two-piece tube connectors consisting of a sleeve and a nut are used when a tubing flare is required. The use of this type connector eliminates no possibility of reducing the flare thickness by wiping or ironing during the tightening process The possibility of reducing the flare thickness by wiping or ironing during the tightening process. Which statement(s) about Military Standard (MS) flareless fittings is/are correct? 1. During installation, MS flareless fittings are normally tightened by turning the nut a specified amount, rather than being torqued. 2. New MS flareless tubing/fittings should be assembled clean and dry without lubrication. 3. During installation, MS flareless fittings are normally tightened by applying a specified torque to the nut 1 2. When flaring aluminum tubing for use with AN fittings, the flare angle must be 37 degrees 30 degrees. Scratches or nicks on the straight portion of aluminum alloy tubing may be repaired if they are no deeper than 10 percent of the wall thickness 15 percent of the wall thickness. Flexible hose used in aircraft systems is classified in size according to the Inside diameter outside diameter. A scratch or nick in aluminum tubing can be repaired provided it does not Appear in the heal of the bend do not Appear in the heal of the bend. Which of the following hose materials are compatible with phosphate-ester base hydraulic fluids? 1. Butyl. 2. Teflon. 3. Buna-N. 4. Neoprene. 1 and 2 3 and 4. Which tubings have the characteristics (high strength, abrasion resistance) necessary for use in a high- pressure (3,000 PSI) hydraulic system for operation of landing gear and flaps? Corrosion resistant steel annealed or 1/4H Corrosion resistant steel annealed or 1/7H. When installing bonded clamps to support metal tubing, Remove paint or anodizing fromm tube clamp location. does not Remove paint or anodizing fromm tube clamp location. In a metal tubing installation, Tension is undesirable because pressurization will cause it to expand and shift Tension is desirable because pressurization will cause it to expand and shift. The best tool to use when cutting aluminum tubing, or any tubing of moderately soft metal is a Hand operated wheel type tubing cutter arms operated wheel type tubing cutter. The primary purpose of providing suitable bends in fluid and pneumatic metal tubing runs is to Prevent excessive stress on the tubing do not Prevent excessive stress on the tubing. Which of the following statements is true regarding minimum allowable bend radii for 1.5 inches OD or less aluminum alloy and steel tubing of the same size? The minimum radius for steel is greater than for aluminum The maximum radius for steel is greater than for aluminum. A gas or fluid line marked with the letters PHDAN is Used to carry a hazardous substance not Used to carry a hazardous substance. Which statement is true regarding the variety of symbols utilized on the identifying color-code bands that are currently used on aircraft plumbing lines? Symbols are always black against white background regardless of the line content Symbols are always white against white background regardless of the line content. If a flared tube coupling nut is overtightened, where is the tube most likely to be weakened/damaged? At the sleeve and flare junction At the arms and flare junction. Which statement concerning Bernoulli's principle is true? The pressure of the fluid decreases at point where the velocity of the fluid increases The pressure of the fluid increase at point where the velocity of the fluid increases. 1) Bonded clamps are used for support when installing metal tubing. (2) Unbonded clamps are used for support when installing wiring. Regarding the above statements, Both 1 and 2 are true Both 1 and 2 are not true. Which statement is true regarding flattening of tubing in bends? Flattening may not be more than 25 percent of the original diameter is permissible Flattening may not be more than 30 percent of the original diameter is permissible. A 3/8 inch aircraft high pressure flexible hose as compared to 3/8 inch metal tubing used in the same system will Have equivalent flow characteristics will not Have equivalent flow characteristics. |
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