Mechanical Aptitude FREE Mechanical Aptitude MCQ Question and Answers 2 — Questions and Answers
Question 1: A wheelbarrow is an example of which class of lever?
- First-class lever
- Second-class lever (Correct answer)
- Third-class lever
- Not a lever
Correct answer: Second-class lever
A wheelbarrow is a second-class lever because the load is between the fulcrum (wheel) and the effort (handles).
Question 2: If two gears are meshed together and the driving gear has 20 teeth while the driven gear has 40 teeth, what is the gear ratio?
- 1:2 (Correct answer)
- 2:1
- 1:4
- 4:1
Correct answer: 1:2
The gear ratio is driving teeth to driven teeth, which is 20:40 or 1:2.
Question 3: What happens to the pressure in a hydraulic system when the area of the output piston is doubled while the input force remains the same?
- Pressure doubles
- Pressure is halved
- Pressure stays the same (Correct answer)
- Pressure quadruples
Correct answer: Pressure stays the same
Pressure in the system depends on input force divided by input piston area, so changing the output piston area does not affect system pressure.
Question 4: A block is placed on an inclined plane at 30 degrees. Which force component acts parallel to the surface pulling the block downward?
- mg cos 30°
- mg sin 30° (Correct answer)
- mg tan 30°
- mg
Correct answer: mg sin 30°
The component of gravitational force parallel to an inclined surface is mg sin(theta).
Question 5: Which type of belt drive arrangement is used to reverse the direction of rotation of the driven pulley?
- Open belt drive
- Crossed belt drive (Correct answer)
- Serpentine belt drive
- V-belt drive
Correct answer: Crossed belt drive
A crossed belt drive causes the driven pulley to rotate in the opposite direction of the driving pulley.
Question 6: In a simple pulley system with 4 supporting ropes, approximately how much force is needed to lift a 200 lb load (ignoring friction)?
- 200 lb
- 100 lb
- 50 lb (Correct answer)
- 25 lb
Correct answer: 50 lb
With 4 supporting ropes the mechanical advantage is 4, so the required force is 200 / 4 = 50 lb.
Mechanical Aptitude FREE Mechanical Aptitude MCQ Question and Answers 2
A wheelbarrow is an example of which class of lever?