APT APT Mechanical Aptitude 1 — Questions and Answers
Question 1: If gear A has 20 teeth and gear B has 10 teeth, and gear A rotates at 100 RPM, how fast does gear B rotate?
- 50 RPM
- 100 RPM
- 150 RPM
- 200 RPM (Correct answer)
Correct answer: 200 RPM
When meshed gears have a 2:1 tooth ratio, the smaller gear spins twice as fast; 100 × (20/10) = 200 RPM.
Question 2: Which type of lever has the fulcrum between the effort and the load?
- First-class lever (Correct answer)
- Second-class lever
- Third-class lever
- Fourth-class lever
Correct answer: First-class lever
A first-class lever has the fulcrum positioned between the effort force and the load (e.g., a seesaw).
Question 3: A pulley system with 4 pulleys requires an effort force to lift a 400-pound load. Approximately how much effort is needed?
- 50 lbs
- 100 lbs (Correct answer)
- 200 lbs
- 400 lbs
Correct answer: 100 lbs
A 4-pulley system provides a mechanical advantage of 4, reducing required effort to 400 ÷ 4 = 100 lbs.
Question 4: What is the purpose of a torque wrench?
- To cut bolts
- To measure and apply a specific tightening force (Correct answer)
- To remove stripped screws
- To drill pilot holes
Correct answer: To measure and apply a specific tightening force
A torque wrench measures and applies a precise amount of rotational force (torque) to fasteners.
Question 5: Water flows through a pipe that narrows from 4 inches to 2 inches in diameter. What happens to the water's speed?
- It decreases
- It stays the same
- It increases (Correct answer)
- It stops
Correct answer: It increases
According to the continuity principle, fluid speeds up when flowing through a narrower pipe to maintain constant flow rate.
Question 6: Which material is the BEST electrical conductor?
- Rubber
- Wood
- Copper (Correct answer)
- Plastic
Correct answer: Copper
Copper is an excellent electrical conductor and is widely used in wiring for this reason.
APT APT Mechanical Aptitude 1
If gear A has 20 teeth and gear B has 10 teeth, and gear A rotates at 100 RPM, how fast does gear B rotate?