SIFT Mechanical Comprehension Questions and Answers 2

Question 1

If a lever has a 4-foot effort arm and a 1-foot resistance arm, what is the mechanical advantage?

Accepted Answer

4

Answer

0.25

Answer

1

Answer

5

Question 2

A gear with 10 teeth drives a gear with 40 teeth. What is the gear ratio and what happens to speed?

Accepted Answer

Gear ratio 1:4; the driven gear spins 4 times slower

Answer

Gear ratio 4:1; the driven gear spins 4 times faster

Answer

Gear ratio 4:1; speed stays the same but torque increases

Answer

Gear ratio 1:1; both gears spin at the same speed

Question 3

Which type of pulley system provides a mechanical advantage of 2?

Accepted Answer

A single movable pulley

Answer

A single fixed pulley

Answer

A block and tackle with three pulleys

Answer

A differential pulley system

Question 4

What is the relationship between pressure and volume in a gas at constant temperature (Boyle's Law)?

Accepted Answer

Pressure and volume are inversely proportional — as one increases, the other decreases

Answer

Pressure and volume are directly proportional — both increase together

Answer

Pressure and volume are independent — they don't affect each other

Answer

Pressure stays constant regardless of volume changes

Question 5

A hydraulic system has a small piston with area 2 in² and a large piston with area 20 in². What force does the large piston exert when 10 lbs is applied to the small piston?

Accepted Answer

100 lb

Answer

1 lb

Answer

10 lb

Answer

200 lb

Question 6

What is the purpose of a torque wrench?

Accepted Answer

To measure and limit the rotational force applied to a fastener to a specified value

Answer

To apply unlimited force to a fastener

Answer

To remove rounded or damaged bolt heads

Answer

To measure the distance a bolt protrudes through a surface