Mechanical Aptitude FREE Mechanical Aptitude Ultimate 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 to lift the load?
- 200 pounds (Correct answer)
- 100 pounds
- 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?
- Bevel gears (Correct answer)
- Spur gears
- Helical gears
- Planetary gears
Correct answer: Bevel gears
Bevel gears have conically shaped teeth and are specifically designed to transmit rotational motion between intersecting shafts at 90 degrees.
Question 3: A hydraulic jack has an input piston with an area of 2 square inches and an output piston with an area of 20 square inches. If 10 pounds of force is applied to the input piston, what is the output force?
- 100 pounds (Correct answer)
- 20 pounds
- 200 pounds
- 10 pounds
Correct answer: 100 pounds
By Pascal's principle, the output force equals the input force multiplied by the ratio of piston areas: 10 × (20/2) = 100 pounds.
Question 4: When a spring is compressed to half its natural length, what happens to the potential energy stored in the spring compared to compressing it to one-quarter of its natural length?
- The energy at half compression is less than at one-quarter compression (Correct answer)
- The energy at half compression is greater
- They store the same energy
- There is no energy stored during compression
Correct answer: The energy at half compression is less than at one-quarter compression
Spring potential energy depends on displacement from natural length; compressing to half the natural length involves less displacement than compressing to one-quarter, so less energy is stored.
Question 5: A 150-pound person stands at the center of a 10-foot uniform beam supported at both ends. What is the support force at each end?
- 75 pounds (Correct answer)
- 150 pounds
- 50 pounds
- 100 pounds
Correct answer: 75 pounds
When a load is placed at the center of a beam supported at both ends, each support bears exactly half the load: 150/2 = 75 pounds.
Question 6: In a belt-and-pulley system, a 4-inch driver pulley is connected to an 8-inch driven pulley. If the driver rotates at 1,200 RPM, what is the speed of the driven pulley?
- 600 RPM (Correct answer)
- 1,200 RPM
- 2,400 RPM
- 300 RPM
Correct answer: 600 RPM
Pulley speed is inversely proportional to diameter, so the driven pulley turns at 1,200 × (4/8) = 600 RPM.
Mechanical Aptitude FREE Mechanical Aptitude Ultimate 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 to lift the load?