IBEW Aptitude Test Mechanical Reasoning Principles Questions and Answers 2

Question 1

A ramp is 10 feet long and rises 2 feet. What is the mechanical advantage of this inclined plane?

Accepted Answer

5

Answer

2

Answer

4

Answer

8

Question 2

Which would be HARDER to turn with the same force: a small-diameter valve wheel or a large-diameter valve wheel?

Accepted Answer

The small wheel, because it has less mechanical advantage

Answer

The small wheel, because it has less torque

Answer

The large wheel, because it has more friction

Answer

Both require equal force

Question 3

Two belts connect three pulleys in series. Pulley A (diameter 4 in) drives Pulley B (diameter 8 in), which drives Pulley C (diameter 4 in). If A turns at 200 RPM, what speed does C turn?

Accepted Answer

200 RPM

Answer

50 RPM

Answer

100 RPM

Answer

400 RPM

Question 4

What type of motion does a crank mechanism convert?

Accepted Answer

Rotary to linear (and vice versa)

Answer

Linear to linear

Answer

Linear to rotary only

Answer

Rotary to rotary

Question 5

If a spring with spring constant k = 50 N/m is compressed 0.4 m, what force does it exert?

Accepted Answer

20 N

Answer

10 N

Answer

15 N

Answer

25 N

Question 6

Which statement about friction is correct?

Accepted Answer

Friction is useful in braking but harmful in bearings

Answer

Friction always acts in the same direction as motion

Answer

Friction always reduces the efficiency of machines

Answer

Friction increases speed in all mechanical systems