Free ASVAB Section 3: Mechanical Comprehension Exam braindumps download (ASVAB Section 3: Mechanical Comprehension exam dumps Free)

QUESTION: 86

Presume that Pulley C is rotating clockwise. What direction will Pulley A rotate?

Clockwise
Counterclockwise
Insufficient information to answer
Pulley A will not rotate

Answer(s): A

Explanation:

By rotating clockwise. Pulley C will cause Pulley B to rotate counterclockwise, which will in turn cause Pulley A to rotate clockwise.

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QUESTION: 87

The rate at which work is done is called __________.

Power
Effort
Watts
Horsepower

Answer(s): A

Explanation:

The English unit of power is foot pound per second. It takes 550 foot pounds to make 1 horsepower. The SI unit is the joule per second or watt. A horsepower is 746 watts. The rate at which work is done is called power. Power is work done per unit of time.

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QUESTION: 88

Forces existing in pairs are sometimes called ___________.

action and interaction
reaction and interaction
action and reaction
friction and gravity

Answer(s): C

Explanation:

A force cannot be exerted unless there is something there to push back. Forces exist in pairs. For every action there is a reaction.

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QUESTION: 89

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

Answer(s): A

Explanation:

Since it is impossible to have one force unless it acts as one of a pair of forces, it means that these forces must be equal in magnitude and opposite in direction.

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