Mechanical Aptitude Mechanical Aptitude Principles 5 — Questions and Answers
Question 1: A box weighing 300 lbs is pushed up a frictionless ramp 15 feet long with a 5-foot rise. What force is required?
- 300 lbs
- 100 lbs (Correct answer)
- 225 lbs
- 45 lbs
Correct answer: 100 lbs
Force = Weight × (height / length) = 300 × (5/15) = 100 lbs.
Question 2: Which of the following tools is used to measure small inside and outside dimensions precisely?
- Torque wrench
- Vernier caliper (Correct answer)
- Spirit level
- Feeler gauge
Correct answer: Vernier caliper
A Vernier caliper measures inside diameter, outside diameter, and depth with high precision.
Question 3: What is the main advantage of a helical gear over a spur gear?
- Higher speed only
- Transfers power between non-parallel shafts only
- Smoother and quieter operation (Correct answer)
- Easier to manufacture
Correct answer: Smoother and quieter operation
Helical gears have angled teeth that engage gradually, resulting in smoother, quieter operation than spur gears.
Question 4: A 500 lb object is hanging from a rope over a fixed pulley. The rope is pulled at an angle. What is the minimum tension needed to hold the object stationary?
- 250 lbs
- 500 lbs (Correct answer)
- 1000 lbs
- 125 lbs
Correct answer: 500 lbs
A single fixed pulley only changes direction of force, not magnitude — tension equals the weight: 500 lbs.
Question 5: What type of stress occurs when forces pull a material apart along its length?
- Compression
- Shear
- Torsion
- Tension (Correct answer)
Correct answer: Tension
Tension is the stress that results from forces pulling a material in opposite directions along its axis.
Question 6: Two objects of different masses fall freely from the same height in a vacuum. Which reaches the ground first?
- The heavier object
- The lighter object
- They reach the ground at the same time (Correct answer)
- Depends on their shape
Correct answer: They reach the ground at the same time
In a vacuum, all objects fall at the same rate regardless of mass because gravity accelerates them equally.
Question 7: A flat belt drive is slipping on a pulley. What is the most effective solution?
- Increase belt width
- Increase belt tension (Correct answer)
- Lubricate the pulley
- Reduce load only
Correct answer: Increase belt tension
Increasing belt tension raises the friction force between the belt and pulley, preventing slip.
Mechanical Aptitude Mechanical Aptitude Principles 5
A box weighing 300 lbs is pushed up a frictionless ramp 15 feet long with a 5-foot rise.
What force is required?