Bennett Mechanical Test Gears and Belt Drives 3 — Questions and Answers
Question 1: A gear with 60 teeth drives a gear with 20 teeth. The driven gear turns how many times per driver revolution?
- 3 times (Correct answer)
- 1/3 time
- 2 times
- 6 times
Correct answer: 3 times
60 divided by 20 equals 3, so the small gear turns three times.
Question 2: Bevel gears are used primarily to transmit motion between shafts that are:
- At an angle to each other (Correct answer)
- Perfectly parallel
- Overlapping
- Connected by a belt
Correct answer: At an angle to each other
Bevel gears transmit power between intersecting, angled shafts.
Question 3: A worm gear arrangement is known for providing:
- High speed reduction (Correct answer)
- High output speed
- No torque change
- Reverse drive only
Correct answer: High speed reduction
Worm gears deliver large speed reductions in a compact space.
Question 4: In a belt drive, if the belt is too loose, the most likely result is:
- Slipping and lost power (Correct answer)
- Increased torque
- Faster output
- Reversed rotation
Correct answer: Slipping and lost power
A loose belt slips on the pulleys and fails to transfer full power.
Question 5: A 5 cm diameter pulley drives a 15 cm diameter pulley. The speed ratio of driver to driven is:
- 3:1 (Correct answer)
- 1:3
- 1:1
- 5:15 unchanged
Correct answer: 3:1
The driver turns three times for each turn of the larger pulley, giving 3:1.
Question 6: Which gear type has teeth cut at an angle, allowing quieter and smoother operation than straight-cut gears?
- Helical gears (Correct answer)
- Spur gears
- Rack gears
- Idler gears
Correct answer: Helical gears
Helical gears engage gradually due to angled teeth, reducing noise.
Question 7: A rack and pinion converts rotational motion into:
- Linear motion (Correct answer)
- Faster rotation
- Reverse torque
- Belt tension
Correct answer: Linear motion
The pinion gear drives the straight rack to produce linear movement.
Bennett Mechanical Test Gears and Belt Drives 3
A gear with 60 teeth drives a gear with 20 teeth.
The driven gear turns how many times per driver revolution?