Gears and Belt Drives Flashcards
7 cards from real Bennett Mechanical Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Gears and Belt Drives flashcards as text
A driver gear with 10 teeth meshes with a driven gear of 40 teeth. What is the gear ratio?
Answer: 1:4
The ratio of driver to driven teeth is 10:40, which simplifies to 1:4.
When a small gear drives a large gear, what happens to the rotational speed?
Answer: Speed decreases
Driving a larger gear reduces output speed while increasing torque.
Two gears that mesh directly will rotate in which directions relative to each other?
Answer: Opposite directions
Externally meshed gears always turn in opposite directions.
An idler gear placed between a driver and driven gear primarily changes what?
Answer: The direction of rotation
An idler reverses rotation direction without altering the overall ratio.
If a belt drive has a large pulley driving a small pulley, the small pulley will turn:
Answer: Faster
A smaller driven pulley spins faster than the larger driving pulley.
A crossed (figure-eight) belt between two pulleys causes them to rotate:
Answer: In opposite directions
Crossing the belt reverses the rotation of the driven pulley.
What is the main advantage of a gear train that reduces speed?
Answer: It increases torque
Speed reduction trades rotational speed for greater torque output.