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 gear train has ratios of 2:1 followed by 3:1. The overall reduction ratio is:
Answer: 6:1
Stage ratios multiply, so 2 times 3 gives a 6:1 reduction.
Backlash in a gear system refers to:
Answer: Play between meshing teeth
Backlash is the small clearance or play between meshed gear teeth.
Which arrangement gives the GREATEST mechanical advantage for lifting a heavy load slowly?
Answer: Small driver into large driven gear
Driving a large gear with a small one maximizes torque for slow, heavy lifting.
In a V-belt drive, the V shape primarily helps to:
Answer: Increase grip and reduce slipping
The wedge shape seats into the pulley groove, increasing friction and grip.
A driver pulley turns at 600 RPM. With a 1:2 step-up to a smaller pulley, the driven speed is:
Answer: 1200 RPM
A 1:2 step-up doubles the speed, giving 1200 RPM.
If a gear in a train is worn and skips teeth, the most likely effect is:
Answer: Loss of smooth power transmission
Worn or skipping teeth cause jerky, unreliable power transfer.
Why are gear drives generally preferred over belt drives when no slipping can be tolerated?
Answer: Gears provide positive, locked engagement
Meshed gear teeth lock together, preventing the slip that belts allow.