TalentLens Mechanical Comprehension 5

Question 1

A pneumatic cylinder uses compressed air at 100 PSI acting on a 3-square-inch piston. What force does it exert?

Accepted Answer

300 lbs

Answer

Force = Pressure × Area = 100 PSI × 3 in² = 300 lbs.

Question 2

A double-block-and-tackle system has two pulleys on a fixed block and two on a moving block. What is its ideal mechanical advantage?

Accepted Answer

4

Answer

A block-and-tackle with 4 rope segments supporting the load has an IMA of 4.

Question 3

A shaft transmits power through a belt drive. If the belt slips, what is the most likely effect on the driven pulley?

Accepted Answer

The driven pulley slows down or stops

Answer

Belt slip reduces friction force, so less torque and speed are transferred to the driven pulley.

Question 4

A structural column is most resistant to buckling when it is:

Accepted Answer

Shorter and stockier

Answer

Shorter, stockier columns have a smaller slenderness ratio and are far more resistant to buckling under compressive loads.

Question 5

Heat is transferred from a hot stove burner to a pan sitting on it primarily by:

Accepted Answer

Conduction

Answer

Direct contact between the burner and the pan transfers heat primarily through conduction.

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