Aptitude Test Mechanical Reasoning Principles Questions and Answers Flashcards
6 cards from real IBEW practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Aptitude Test Mechanical Reasoning Principles Questions and Answers flashcards as text
A pump moves fluid at 10 gallons per minute. If the pipe diameter is reduced by half, and flow speed doubles to compensate, what happens to flow rate?
Answer: Flow rate decreases to 5 GPM
Area ∝ diameter². Halving diameter reduces area to 1/4. Doubling speed: new flow = (1/4 area) × (2× speed) = 1/2 original = 5 GPM.
What is the primary function of a flywheel in a mechanical system?
Answer: To store rotational energy and smooth out speed fluctuations
A flywheel stores kinetic energy in its rotating mass, smoothing out speed fluctuations between power strokes in an engine.
A force of 50 lbs is applied 3 feet from the fulcrum of a lever. What torque (moment) is created?
Answer: 150 ft-lbs
Torque = Force × Distance = 50 × 3 = 150 ft-lbs.
Which of the following describes a 'wedge' used as a simple machine?
Answer: Increases force by converting a small pushing force to a large splitting force at the sides
A wedge is a double inclined plane that converts a pushing force into splitting forces directed outward from its sides.
Ball bearings are used in electric motors primarily to:
Answer: Support the shaft and reduce friction during rotation
Ball bearings support the rotor shaft's weight and reduce rotational friction, allowing smooth, efficient rotation.
Two gears are in mesh. Gear 1 has 12 teeth and rotates at 300 RPM. Gear 2 has 48 teeth. What is Gear 2's torque ratio compared to Gear 1 (assuming 100% efficiency)?
Answer: 4:1 (Gear 2 has 4 times the torque)
Torque ratio is inverse of speed ratio. Speed ratio = 12/48 = 1/4 (Gear 2 is 4× slower), so torque ratio = 4/1 (Gear 2 has 4× more torque).