Mechanical Aptitude FREE Mechanical Aptitude Knowledge Question and Answers 2 — Questions and Answers
Question 1: A worker needs to lift a 200-pound load using a single fixed pulley. How much force must the worker apply to the rope?
- 100 pounds
- 200 pounds (Correct answer)
- 400 pounds
- 50 pounds
Correct answer: 200 pounds
A single fixed pulley changes the direction of force but does not provide a mechanical advantage, so the full 200 pounds must be applied.
Question 2: Which type of gear arrangement is used to transmit motion between two shafts that are perpendicular to each other?
- Spur gears
- Bevel gears (Correct answer)
- Worm gears
- Helical gears
Correct answer: Bevel gears
Bevel gears have cone-shaped teeth and are specifically designed to transmit rotational motion between intersecting shafts at an angle, typically 90 degrees.
Question 3: If a hydraulic system has an input piston area of 2 square inches and an output piston area of 10 square inches, what is the mechanical advantage?
- 2
- 5 (Correct answer)
- 10
- 20
Correct answer: 5
Mechanical advantage in a hydraulic system equals the output piston area divided by the input piston area: 10 / 2 = 5.
Question 4: A spring with a spring constant of 50 N/m is compressed 0.2 meters. What force does the spring exert?
- 5 N
- 10 N (Correct answer)
- 25 N
- 100 N
Correct answer: 10 N
Using Hooke's Law (F = kx), the force is 50 N/m multiplied by 0.2 m, which equals 10 N.
Question 5: In a belt-and-pulley system, the driver pulley has a diameter of 8 inches and the driven pulley has a diameter of 4 inches. If the driver turns at 100 RPM, how fast does the driven pulley rotate?
- 50 RPM
- 100 RPM
- 200 RPM (Correct answer)
- 400 RPM
Correct answer: 200 RPM
The speed ratio is inversely proportional to the diameter ratio, so the driven pulley spins at (8/4) x 100 = 200 RPM.
Question 6: What is the primary purpose of a flywheel in a mechanical system?
- To increase the speed of rotation
- To store rotational energy and smooth out fluctuations in speed (Correct answer)
- To reverse the direction of rotation
- To reduce friction between moving parts
Correct answer: To store rotational energy and smooth out fluctuations in speed
A flywheel stores kinetic energy due to its mass and moment of inertia, releasing it to maintain consistent rotational speed during power fluctuations.
Mechanical Aptitude FREE Mechanical Aptitude Knowledge Question and Answers 2
A worker needs to lift a 200-pound load using a single fixed pulley.
How much force must the worker apply to the rope?