Mechanical Aptitude FREE Mechanical Aptitude Principles Question and Answers 2 — Questions and Answers
Question 1: A worker needs to lift a 200 lb object using a single fixed pulley. How much force must the worker apply to the rope?
- 100 lb
- 200 lb (Correct answer)
- 400 lb
- 50 lb
Correct answer: 200 lb
A single fixed pulley changes the direction of force but does not provide any mechanical advantage, so the full 200 lb must be applied.
Question 2: Which type of stress occurs in a bolt when it is tightened to clamp two plates together?
- Shear stress
- Compressive stress
- Tensile stress (Correct answer)
- Torsional stress
Correct answer: Tensile stress
Tightening a bolt stretches it along its axis, placing it under tensile stress.
Question 3: If a hydraulic system has a master cylinder with an area of 2 square inches and a slave cylinder with an area of 10 square inches, what is the mechanical advantage?
- 2
- 5 (Correct answer)
- 10
- 20
Correct answer: 5
Mechanical advantage equals the slave cylinder area divided by the master cylinder area: 10 / 2 = 5.
Question 4: A beam is supported at both ends with a load applied at the center. What type of beam configuration is this?
- Cantilever beam
- Simply supported beam (Correct answer)
- Fixed beam
- Continuous beam
Correct answer: Simply supported beam
A beam resting on two supports with a load between them is a simply supported beam.
Question 5: What happens to the pitch of a sound when the frequency of vibration increases?
- Pitch decreases
- Pitch stays the same
- Pitch increases (Correct answer)
- Pitch fluctuates randomly
Correct answer: Pitch increases
Pitch is directly proportional to frequency, so higher frequency produces a higher pitch.
Question 6: Which principle explains why an airplane wing generates lift?
- Pascal's principle
- Archimedes' principle
- Bernoulli's principle (Correct answer)
- Newton's first law
Correct answer: Bernoulli's principle
Bernoulli's principle states that faster-moving air over the curved top of the wing creates lower pressure, generating lift.
Mechanical Aptitude FREE Mechanical Aptitude Principles Question and Answers 2
A worker needs to lift a 200 lb object using a single fixed pulley.
How much force must the worker apply to the rope?