Mechanical Aptitude Principles Flashcards
7 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 7 Mechanical Aptitude Principles flashcards as text
A pulley system has one fixed and one movable pulley. How much force is needed to lift a 240 lb load?
Answer: 120 lbs
A compound pulley with one movable pulley provides a mechanical advantage of 2, so force needed is 240/2 = 120 lbs.
What is the primary purpose of a bearing in a rotating machine?
Answer: Reduce friction between moving parts
Bearings reduce friction between the rotating shaft and stationary housing, improving efficiency and life.
A spring with a constant of 50 N/m is compressed by 0.2 m. What force does it exert?
Answer: 10 N
Hooke's Law: F = k × x = 50 × 0.2 = 10 N.
Which of the following is an example of a third-class lever?
Answer: Tweezers
In a third-class lever the effort is between the fulcrum and load; tweezers fit this description.
Water flows through a pipe that narrows from 4 inches to 2 inches in diameter. What happens to the water's speed?
Answer: It quadruples
Area decreases by a factor of 4 (diameter halved), so velocity must quadruple to maintain flow rate (continuity equation).
A ramp is 12 feet long and 3 feet tall. What is the mechanical advantage of the ramp?
Answer: 4
Mechanical advantage of an inclined plane = length / height = 12 / 3 = 4.
Which fastener is designed to prevent loosening caused by vibration?
Answer: Lock nut (Nyloc)
A lock nut (Nyloc) uses a nylon insert to grip the bolt threads and resist vibration-induced loosening.