Mechanical Aptitude Levers, Pulleys, and Gears 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 Levers, Pulleys, and Gears flashcards as text
A wheelbarrow is an example of which class of lever?
Answer: Second class
A wheelbarrow is a second-class lever because the load is between the fulcrum (wheel) and the effort (handles).
Two gears are meshed together. Gear A has 40 teeth and Gear B has 10 teeth. If Gear A rotates at 100 RPM, how fast does Gear B rotate?
Answer: 400 RPM
Speed ratio is inversely proportional to tooth count: Gear B speed = (40/10) × 100 = 400 RPM.
A fixed pulley changes the _______ of a force but not the _______ required.
Answer: direction; magnitude
A fixed pulley only redirects the force (direction), providing no mechanical advantage — the effort equals the load.
On a lever, if the effort arm is 3 feet and the resistance arm is 1 foot, what is the mechanical advantage?
Answer: 3
Mechanical advantage = effort arm ÷ resistance arm = 3 ÷ 1 = 3.
In a compound pulley system with 4 rope segments supporting the load, what is the mechanical advantage?
Answer: 4
In a block-and-tackle system, the mechanical advantage equals the number of rope segments that support the moving pulley.
A driver gear with 20 teeth meshes with a driven gear with 60 teeth. The gear ratio is:
Answer: 1:3 (speed reduction)
Gear ratio = driven teeth ÷ driver teeth = 60 ÷ 20 = 3:1 speed reduction (torque increases).
Which lever class has the effort applied between the fulcrum and the load?
Answer: Third class
In a third-class lever, the effort is applied between the fulcrum and the load, providing speed and range of motion but no mechanical advantage greater than 1.