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

MA = length of ramp / height = 10 / 2 = 5.

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

A larger wheel provides more torque (moment arm × force), so a smaller wheel is harder to turn with the same applied 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

A→B: B = 200 × 4/8 = 100 RPM. B→C: C = 100 × 8/4 = 200 RPM.

Question 4

What type of motion does a crank mechanism convert?

Accepted Answer

Rotary to linear (and vice versa)

Answer

A crank converts rotary (circular) motion to linear (back-and-forth) motion, and vice versa.

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

F = k × x = 50 × 0.4 = 20 N.

IBEW - Aptitude Test Practice Test

IBEW - Aptitude Test Practice Test

IBEW Aptitude Test Mechanical Reasoning Principles Questions and Answers 2