ASVAB Mechanical Comprehension 3

Question 1

A cam converts which type of motion into another?

Accepted Answer

Rotary to oscillating/linear

Answer

A cam converts rotary motion into reciprocating or oscillating linear motion via a follower.

Question 2

Two objects of different masses are dropped from the same height in a vacuum. Which hits the ground first?

Accepted Answer

They hit at the same time

Answer

In a vacuum, gravity accelerates all objects equally regardless of mass, so both hit simultaneously.

Question 3

Which material is the best conductor of heat?

Accepted Answer

Copper

Answer

Copper has a very high thermal conductivity, making it the best heat conductor among these options.

Question 4

A driver gear with 40 teeth meshes with a driven gear with 10 teeth. If the driver turns at 100 RPM, what is the speed of the driven gear?

Accepted Answer

400 RPM

Answer

Speed ratio is inverse of tooth ratio: 100 × (40/10) = 400 RPM.

Question 5

Which class of lever has the fulcrum located between the effort and the load?

Accepted Answer

First class

Answer

A first-class lever (like a seesaw or crowbar) has the fulcrum between effort and load.

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