Knowledge Questions and Answers Flashcards
6 cards from real MECHANICAL APTITUDE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Knowledge Questions and Answers flashcards as text
What simple machine is a doorknob an example of?
Answer: Wheel and axle
A doorknob is an example of a wheel and axle. The knob acts as the wheel (larger diameter), and the spindle that retracts the latch acts as the axle (smaller diameter). This provides mechanical advantage by converting a large rotation into a smaller, more forceful rotation.
What is the purpose of a flywheel in an engine?
Answer: To store rotational energy and smooth out power delivery
A flywheel is a heavy rotating disc that stores rotational kinetic energy. In an engine, it smooths out the intermittent power pulses from the pistons, maintaining more constant rotational speed between firing strokes.
Which material property describes how well a material can be permanently deformed without breaking?
Answer: Ductility
Ductility is the ability of a material to undergo significant plastic deformation before fracture. Highly ductile materials like copper and gold can be drawn into thin wires without breaking.
What does a torque wrench measure?
Answer: The tightening force applied to a fastener
A torque wrench measures and controls the rotational force (torque) applied when tightening bolts and nuts. This ensures fasteners are tightened to precise specifications, preventing both under-tightening (loose connections) and over-tightening (damaged threads or components).
What type of energy does a compressed spring store?
Answer: Elastic potential energy
A compressed (or stretched) spring stores elastic potential energy. This energy is released when the spring returns to its natural length, converting into kinetic energy. The energy stored equals ½kx², where k is the spring constant and x is the displacement.
What is the primary advantage of using ball bearings in a rotating assembly?
Answer: They reduce friction between moving parts
Ball bearings dramatically reduce friction by replacing sliding contact with rolling contact between moving parts. The balls roll between inner and outer races, minimizing energy loss and heat generation while supporting loads.