OAR OAR Mechanical Reasoning 5

Question 1

A cam converts rotational motion into which type of motion?

Accepted Answer

Reciprocating (back-and-forth) linear motion

Answer

A cam's irregular profile converts the rotational input into linear reciprocating motion in the follower.

Question 2

A 500 N load is lifted using a ramp that is 5 m long and 1 m high. Ignoring friction, what effort force is required to push the load up the ramp?

Accepted Answer

100 N

Answer

Mechanical advantage of inclined plane = length/height = 5; Force = 500/5 = 100 N.

Question 3

Which of the following is the BEST conductor of electricity?

Accepted Answer

Copper

Answer

Copper has very low electrical resistivity and is the most common electrical conductor used in wiring.

Question 4

A pitch propeller creates thrust by pushing water backward. If a propeller's pitch is 12 inches, it theoretically advances how far per revolution?

Accepted Answer

12 inches

Answer

Propeller pitch is the theoretical distance it advances through the water in one full revolution.

Question 5

A sound wave travels from air into water. Its speed will:

Accepted Answer

Increase because water transmits sound better

Answer

Sound travels approximately 4.3 times faster in water than in air due to water's greater bulk modulus.

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