ASVAB: Mechanical Comprehension

An induction clutch works by

magnetism

If the first-class lever with a resistance arm measuring 2 feet and an effort arm measuring 8 feet are being used, what's the mechanical advantage?

4

The bottom of four boxes are shown below. The boxes all have the same volume. If postal regulations state that the sides of a box must meet a minimum height, which box is most likely to be too short to go through the mail?

No. 3

Looking at the figure below, when Anvil B lands on the seesaw, Anvil A will

rise in the air quickly

Air pressure at sea level is about 15 psi. What's the amount of force exerted on the top of your head, given a surface area of 24 square inches?

360 pounds

The force produced when a boxer's hand hits a heavy bag and "bounces" off it is called

recoil

In the figure below, if Gear 1 has 25 teeth and Gear 2 has 15 teeth, how many revolutions does Gear 2 make for every 10 revolutions Gear 1 makes?

about 16 2/3

A cubit foot of water weights about 62.5 pounds. If an aquarium is 18 feet long, 10 feet deep, and 12 feet wide, what's the approximate pressure in pounds per square inch (psi) on the bottom of the tank?

4 psi

Springs use in machines are usually made of

steel

A clutch is a type of

coupling

When Cam A completes one revolution, the lever will touch the contact point

twice

A single block-and-fall is called a

runner

In the figure below, if the fulcrum supporting the lever is moved closer to the anvil, the anvil will be

easier to life, but will not move as high

The mechanical advantage of the block-and-tackle arrangement shown below is

2

In the figure below, f the cogs move up the track at he same rate of speed, Cog A will

reach the top before Cog B

If a house key, a wooden spoon, a plastic hanger, and a wool jacket are all the same temperature on a cool day, which one feels the coldest?

key

In the figure below, assume the valves are all closed. To fill the tank, but prevent it form filling entirely, which valves should be opened?

1, 2, 3, and 5 only

If Gear A is turned to the left,

Gear B turns to the right and Gear C turns to the left

If Gear 1 moves in a clockwise direction, which other gears also turn clockwise?

3 and 5

The pressure gauge in the figure below shows a reading of

21.0

A way to determine the amount of power being used is to

divide the amount of work done by the amount of time it takes.

A wood too, a silver tool, and a steel tool are placed in boiling water for cleaning. Which tool will get hot most quickly?

Silver

A runner is being used in the figure shown. How much effort is the boy who's lifting the 50-pound anvil using? Disregard friction, wing resistance and the weight of the pulley and the rope.

50-pound effort

In the figure below, at what point was the all traveling most slowly?

C

In the figure below, which angle is braced most solidly?

A