QUESTION: 73

Using a runner gives you a mechanical advantage of __________.

Answer(s): B

Explanation:

Using a runner (a single, moveable pulley) gives a mechanical advantage of 2.

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QUESTION: 74

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

Answer(s): A

Explanation:

Because 60 seconds comprise a minute, the valve must open 60 times per minute. The cam will open the valve 10 times per revolution, so 60 ÷ 10 = 6.
The cam must make 6 revolutions per minute to raise the valve 60 times per minute.

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QUESTION: 75

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.

Answer(s): D

Explanation:

Because Valve 4 is above the bottom of the tank, some water will remain in the tank below the level of the valve, so the tank will never be completely empty.

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QUESTION: 76

Heat is a form of _______________.

calories
energy
beneficence
motion

Answer(s): B

Explanation:

Heat is a form of energy – Calories measure heat, beneficence is an attitude or emotion, and motion is something that can cause heat.

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Free ASVAB Section 3: Mechanical Comprehension Exam Braindumps (page: 19)

QUESTION: 73

Explanation:

QUESTION: 74

Explanation:

QUESTION: 75

Explanation:

QUESTION: 76

Explanation: