Mechanical Aptitude Test Knowledge 1 — Questions and Answers
Question 1: What type of lever is a pair of scissors?
- First-class lever (Correct answer)
- Second-class lever
- Third-class lever
- Fourth-class lever
Correct answer: First-class lever
Scissors are first-class levers because the fulcrum (the pivot pin) is located between the effort (your hand) and the load (the material being cut).
Question 2: What is the primary function of a governor in a mechanical system?
- To increase rotational speed
- To regulate and limit operating speed (Correct answer)
- To measure torque output
- To convert rotational to linear motion
Correct answer: To regulate and limit operating speed
A governor automatically regulates the speed of an engine or machine, preventing it from exceeding a set maximum by adjusting fuel or throttle input.
Question 3: Which property of a metal describes its ability to be drawn into a wire?
- Brittleness
- Hardness
- Ductility (Correct answer)
- Elasticity
Correct answer: Ductility
Ductility is the property that allows a material to be stretched or drawn into thin wires without breaking. Copper and gold are highly ductile metals.
Question 4: In a pulley system, what is the mechanical advantage of a single fixed pulley?
- 0
- 1 (Correct answer)
- 2
- 4
Correct answer: 1
A single fixed pulley only changes the direction of the force, not its magnitude. The mechanical advantage is 1, meaning the effort required equals the load.
Question 5: What does a manometer measure?
- Electrical current
- Fluid pressure (Correct answer)
- Temperature
- Rotational speed
Correct answer: Fluid pressure
A manometer is an instrument used to measure the pressure of gases or liquids. It typically uses a column of liquid to indicate pressure differences.
Question 6: Which gear arrangement reverses the direction of rotation between input and output shafts?
- Worm gear
- Bevel gear
- Spur gear with an idler gear (Correct answer)
- Planetary gear
Correct answer: Spur gear with an idler gear
When an idler gear is placed between two spur gears, it reverses the direction of rotation at the output shaft while the input and output shafts remain parallel.
Mechanical Aptitude Test Knowledge 1
What type of lever is a pair of scissors?