Gear Calculation MCQs

1. What is the formula for calculating the gear ratio?

Gear ratio = Number of teeth on driven gear / Number of teeth on driving gear
Gear ratio = Number of teeth on driving gear / Number of teeth on driven gear
Gear ratio = Number of teeth on driving gear + Number of teeth on driven gear
Gear ratio = Number of teeth on driven gear - Number of teeth on driving gear

2. How do you calculate the pitch diameter of a gear?

Pitch diameter = Number of teeth / Module
Pitch diameter = Module / Number of teeth
Pitch diameter = Number of teeth * Module
Pitch diameter = Module + Number of teeth

3. What is the module of a gear?

Module = Pitch diameter / Number of teeth
Module = Number of teeth / Pitch diameter
Module = Pitch diameter * Number of teeth
Module = Pitch diameter + Number of teeth

4. How is the circular pitch of a gear calculated?

Circular pitch = Number of teeth / Pitch diameter
Circular pitch = Pitch diameter / Number of teeth
Circular pitch = Pitch diameter * Number of teeth
Circular pitch = Pi * Pitch diameter / Number of teeth

5. What is the addendum of a gear?

The radial distance between the pitch circle and the root circle
The radial distance between the pitch circle and the top land
The radial distance between the root circle and the top land
The radial distance between the pitch circle and the bottom land

6. What is the dedendum of a gear?

The radial distance between the pitch circle and the root circle
The radial distance between the pitch circle and the top land
The radial distance between the root circle and the top land
The radial distance between the pitch circle and the bottom land

7. How do you calculate the number of teeth on a gear if the module and pitch diameter are known?

Number of teeth = Module / Pitch diameter
Number of teeth = Pitch diameter / Module
Number of teeth = Module * Pitch diameter
Number of teeth = Module + Pitch diameter

8. What is the backlash in gears?

The gap between the top land and the root circle
The gap between the pitch circle and the root circle
The gap between the meshing teeth of two gears
The gap between the root circle and the top land

9. What is the base circle of a gear?

The circle from which the involute portion of the tooth profile is generated
The circle that defines the size of the gear
The circle that represents the root of the gear teeth
The circle that represents the top of the gear teeth

10. How do you calculate the gear ratio in a compound gear train?

Gear ratio = (Number of teeth on driving gear / Number of teeth on driven gear) * Number of stages
Gear ratio = Number of teeth on driving gear / Number of teeth on driven gear
Gear ratio = (Number of teeth on driven gear / Number of teeth on driving gear) * Number of stages
Gear ratio = Number of teeth on driven gear / Number of teeth on driving gear

11. What is the primary purpose of an idler gear?

To change the speed of rotation
To change the direction of rotation
To increase the torque
To decrease the torque

12. How is the pressure angle of a gear defined?

The angle between the pitch circle and the root circle
The angle between the line of action and the tangent to the pitch circle
The angle between the top land and the root circle
The angle between the addendum and the dedendum

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