FCTC FCTC Mechanical Reasoning Principles Questions and Answers 3

Question 1

A spring stretches 3 inches when a 6-lb weight is hung from it. How far will it stretch with a 9-lb weight, assuming elastic behavior?

Accepted Answer

4.5 inches

Answer

3 inches

Answer

4 inches

Answer

6 inches

Question 2

Two pulleys are connected by a belt. Pulley A has a 6-inch radius and Pulley B has a 2-inch radius. If Pulley A turns at 30 RPM, how fast does Pulley B turn?

Accepted Answer

90 RPM

Answer

10 RPM

Answer

30 RPM

Answer

60 RPM

Question 3

A wedge is driven under a load. As the wedge angle decreases (becomes thinner), what happens to the mechanical advantage?

Accepted Answer

It increases

Answer

It decreases

Answer

It stays the same

Answer

It becomes zero

Question 4

Which factor does NOT affect the amount of work done on an object?

Accepted Answer

The color of the object

Answer

The force applied

Answer

The distance moved

Answer

The direction of force relative to motion

Question 5

A hydraulic jack has an input piston with area 2 sq in and an output piston with area 20 sq in. If you apply 10 lb of force to the input, what force is produced at the output?

Accepted Answer

100 lb

Answer

1 lb

Answer

10 lb

Answer

200 lb

Question 6

When two gears of different sizes are meshed, which gear has greater torque?

Accepted Answer

The larger gear

Answer

The smaller gear

Answer

Both have equal torque

Answer

Torque depends only on speed