ASVAB Test 33 - Mechanical Comprehension

Helical gears have ___________. straight teeth. slanted teeth. teeth of unequal size. no advantage over spur gears.

In the figure above, which pillar supports the greater load of the cat?. Pillar A. Pillar B. Both pillars support the cat equally. It's impossible to determine from the information given.

Wheel A has a diameter of 10 feet. Wheel B has a diameter of 8 feet. If both wheels revolve at the same rate, Wheel B will cover a linear distance of 16 feet ___________. at the same time as Wheel A. more slowly than Wheel A. in twice the time as Wheel A. faster than Wheel A.

What effort must be used to lift a 30-pound cat (see the figure above) using a first-class lever? (Don't include the weight of the lever in your calculations.). 10 pounds. 15 pounds. 50 pounds. 5 pounds.

What mechanical advantage does the block and tackle arrangement in the above figure give?. 1. 3. 2. 4.

If a ramp is 8-feet long and 4-feet high, how much effort is required to move a 400-pound object up the ramp?. 35 pounds. 150 pounds. 800 pounds. 200 pounds.

33,000 foot-pounds of work done in one minute is called ___________. a job for an enlisted soldier. one horsepower. 330 psi. meaningful force.

A 130-pound woman is wearing shoes with high heels that measure 1-inch square. If the woman is standing on one heel, what psi does the heel exert as it rests on the ground? (Disregard atmospheric pressure from your calculations.). 130. 65. 260. 11.

The force that causes clothes from the dryer to stick together is called ___________. gravity. magnetism. friction. static electricity.

An aneroid barometer measures ___________. atmospheric pressure. water pressure. hydraulic-fluid pressure. the ambient temperature.

If Gear A is revolving in a clockwise manner, as seen in the figure above, Gear B ___________. remains stationary. revolves in a clockwise manner. revolves in a counterclockwise manner. turns more slowly than Gear A.

Springs are used for the following purposes EXCEPT ___________. to store energy for part of a mechanical cycle. to force a mechanical component to maintain contact with another component. to reduce shock or impact. to increase the weight of a mechanism.

The floats in Tubes A and B measure specific gravity. Which tube contains the liquid with the higher specific gravity?. Tube A. Tube B. It can't be determined. Both Tube A and Tube B have the same specific gravity.

Universal joints are used to ___________. connect ball bearings. fix two shafts so they don't pivot or rotate. connect shafts in a U-shape. couple two shafts set at different angles.

The try-cock in the schematic above measures ___________. temperature of water. pressure of water. pressure of steam buildup. level of water.

The steel plate above is held in place by different machine screws, each indicated by different symbols. How many different types of machine screws have been used?. 6. 15. 5. 9.

The amount of force (F) needed to balance the lever in the figure above is most nearly ___________. 15 Pounds. 13 Pounds. 7.5 Pounds. 20 Pounds.

With one complete revolution of the cable winch shown above, the load will move __________. 12 inches. 6 inches. 24 inches. 36 inches.

In the figure above, assume the valves are all closed. Which valves need to be open to fill the tank entirely?. 1 and 2 only. 1 only. 1, 2, and 3. 2 only.

If Gear 1 in the figure above makes 10 complete clockwise revolutions per minute, then __________. Gear 2 makes 2 clockwise revolutions per minute. Gear 3 makes 8 clockwise revolutions per minute. Gear 3 makes 30 clockwise revolutions per minute. Gear 3 makes 9 counterclockwise revolutions per minute.

A gear and pinion have a ratio of 4 to 1. If the gear makes 200 revolutions per minute, the speed of the pinion is __________. 50 rpm. 800 rpm. 400 rpm. 200 rpm.

The gas gauge in an auto relies on what mechanical device to measure the amount of gas in the tank?. ball and cock. automatic valve. float. mechanical switch.

Using a runner gives you a mechanical advantage of ___________. 4. 2. 3. 1.

For the valve shown in the figure above to open once each second, the cam must revolve at a rate of __________. 6 rpm. 10 rpm. 15 rpm. 3 rpm.

The figure above represents a water tank. Which of the following statements is not true?. If Valves 1 and 2 are open and Valves 3, 4, and 5 are closed, the tank will eventually overflow. If all valves are open, the water remains at a constant level as long as the rate of intake is equal to the rate of discharge. Water in the tank will rise if Valves 1 and 2 are open and Valves 3 and 4 are closed. The tank will empty entirely if Valves 1 and 2 are closed and Valves 4 and 5 are open.

Heat is a form of ___________. calories. energy. beneficence. motion.

The lift caused by an aircraft's wings is primarily due to ___________. a decrease in pressure on the upper side of the wing (A). a decrease in pressure on the bottom side of the wing B. a vacuum created under the wing at point B. an increase in pressure on the upper side of the wing (A).

Pliers are an example of a ___________. first-class lever. second-class lever. third-class lever. fourth-class lever.

The wheels below are connected by a belt as shown. If the larger wheel makes two revolutions, how many revolutions will the smaller wheel make?. Less than one. One. Two. More than two.

In the diagram in question 4, if the wheel on the left turns clockwise, which way will the wheel on the right turn?. Clockwise. Counterclockwise. Counter-counterclockwise. Unable to tell from the information given.

How can a gear system derive the greatest amount of mechanical advantage when a seven-tooth gear drives a ___________?. 29-tooth gear. 5-toothgear. 24-tooth gear. 17-tooth gear.

An above-ground suburban water tank holds 540 gallons of water when full. If the tank starts out full and is drained at a rate of 60 gallons per minute, how many seconds will it take to empty out halfway?. 54. 240. 270. 480.

Which of the following is not a simple machine?. Lever. Inclined plane. Axe. Pulley.

If you want to hammer in a heavy nail, it might be a good idea to use a hammer with a __________. lighter head. heavy head. longer handle. shorter handle.

If you drag a log across the road, one way to reduce the amount of force needed to pull it would be to ___________. use a thicker rope. pull harder. cross at an angle. lubricate the road.

Presume that Pulley C is rotating clockwise. What direction will Pulley A rotate?. Clockwise. Counterclockwise. Insufficient information to answer. Pulley A will not rotate.

The rate at which work is done is called __________. Power. Effort. Watts. Horsepower.

Forces existing in pairs are sometimes called __________. action and interaction. reaction and interaction. action and reaction. friction and gravity.

When forces act in pairs they are ___________. equal in magnitude and opposite in direction. equal in magnitude and in the same direction. equal in magnitude. unequal in magnitude.

Which pendulum takes less time to make one complete back-and-forth swing?. X. Y. Both take the same amount of time. There is not enough information to calculate the answer.

When you heat water that is confined in a closed container so that the steam cannot escape, the pressure inside the container __________ and the temperature of the boiling water __________. increases, decreases. increases, increases. decreases, decreases. decreases, increases.

If Block A, on which the lever is resting, is moved farther away from Block B __________. it will be harder to lift Block B but it will go higher. it will be easier to lift Block B and it will go higher. it will be harder to lift Block B and it will not be lifted to the same height. it will be easier to lift Block B but it will not be lifted as high.

For two gears to mesh properly, they must __________. rotate at the same speed. rotate in the same direction. have the same size teeth. have the same number of teeth.

Kinetic energy is __________. energy stored in chemicals, such as in a battery. energy in moving electrons, as in an electric current. energy in a moving object. energy that can be released under certain conditions.

The amount that a machine (simple or complex) multiplies your force or effort is called __________. load distance. mechanical advantage. resistance effect. acceleration.

The mechanical advantage of two meshing gears is calculated by dividing __________. the number of teeth on the driving gear by the number of teeth on the driven gear. the number of teeth on the driven gear by the number of teeth on the driving gear. the number of teeth on the driving gear by the rotational speed. the diameter of the driven gear by the number of teeth on the driving gear.

A compound machine is one in which __________. a battery provides the force. one simple machine rotates around the second one. two or more simple machines work together. the mechanical advantages can be made to balance each other out.

When meshing or interlocking gears have different numbers of teeth, __________. relative speeds depend on the speed of the drive aide for both. both gears will rotate at the same speed. the gear with more teeth will rotate fester than the gear with fewer teeth. the gear with fewer teeth will rotate fester than the gear with more teeth.

Cranks are used to __________. convert motion in a circle into motion in a straight line. convert motion in a straight line into motion in a circle. attach to rotating shafts to push separate pieces in a given direction. transfer power between rotating shafts of different diameters.

Which of the other gears is moving in the opposite direction from Gear 1?. Gear 2. Gear 3. Both Gears 2 and 3. Neither Gear 2 or 3.