Bennett Mechanical Test Gears and Belt Drives 5

Question 1

A gear train has ratios of 2:1 followed by 3:1. The overall reduction ratio is:

Accepted Answer

6:1

Answer

5:1

Answer

1:6

Answer

3:2

Question 2

Backlash in a gear system refers to:

Accepted Answer

Play between meshing teeth

Answer

Belt slipping off

Answer

Reverse rotation

Answer

Excess torque output

Question 3

Which arrangement gives the GREATEST mechanical advantage for lifting a heavy load slowly?

Accepted Answer

Small driver into large driven gear

Answer

Large driver into small driven gear

Answer

Two equal gears

Answer

A crossed belt

Question 4

In a V-belt drive, the V shape primarily helps to:

Accepted Answer

Increase grip and reduce slipping

Answer

Slow the motor down

Answer

Reverse rotation

Answer

Add gear teeth

Question 5

A driver pulley turns at 600 RPM. With a 1:2 step-up to a smaller pulley, the driven speed is:

Accepted Answer

1200 RPM

Answer

300 RPM

Answer

600 RPM

Answer

150 RPM

Question 6

If a gear in a train is worn and skips teeth, the most likely effect is:

Accepted Answer

Loss of smooth power transmission

Answer

Higher torque output

Answer

Faster rotation

Answer

Reversed direction

Question 7

Why are gear drives generally preferred over belt drives when no slipping can be tolerated?

Accepted Answer

Gears provide positive, locked engagement

Answer

Gears are always cheaper

Answer

Gears are quieter

Answer

Gears need no lubrication