This set of Mechatronics Multiple Choice Questions & Answers (MCQs) focuses on “Mechanical Actuating Systems – Gear and Gear Trains – 1”.

1. What is the module of a gear if its pitch diameter is 10mm and it contains 5 teeth?

a) 2

b) 3

c) 4

d) 5

View Answer

Explanation: Given:

Pitch diameter = 10mm

No. Of teeth=5 teeth

Module=Pitch diameter/No. Of teeth

Module=>10/5 =2.

2. What is the pitch of a gear if the gear contains 30 teeth and diameter of the gear is 6 inches?

a) 2

b) 3

c) 4

d) 5

View Answer

Explanation: Given:

No. Of teeth=30 teeth

Diameter=6 inches

Pitch=Number of teeth/Diameter

Pitch=30/6=5.

3. What is the torque offered by a gear, if the tangential force is 20 N and radius of the gear is 1m?

a) 5Nm

b) 15Nm

c) 20Nm

d) 2.55Nm

View Answer

Explanation: Given:

Tangential force=20N

Radius of the gear=1m

Torque=tangential force (F)*Radius(R)

Torque=20*1=>20Nm.

4. What is the radius of a gear, if torque generated by the gear is 20Nm and the tangential force is 5N?

a) 5m

b) 15m

c) 10m

d) 4m

View Answer

Explanation: Given:

No. Of teeth=30 teeth

Diameter=6 inches

Pitch=Number of teeth/Diameter

Pitch=30/6 = 5.

5. The pitch of a gear is defined as the number of teeth per unit pitch circle radius.

a) True

b) False

View Answer

Explanation: The pitch of a gear is not the number of teeth per unit pitch circle radius. It is defined as the number of teeth per unit pitch circle diameter. The diameter is taken in inches.

6. The radial distance between root circle and pitch circle is called addendum.

a) True

b) False

View Answer

Explanation: The radial distance between root circle and pitch circle is not called addendum. The radial distance between root circle and pitch circle is called dedendum. Radial distance between addendum circle and pitch circle is called addendum.

7. What is the velocity ratio of two gears if the driver gear has 15 teeth and driven gear has 5 teeth?

a) 2:1

b) 3:1

c) 4:3

d) 5:1

View Answer

Explanation: Given:

No. Of teeth of driver gear=15

No. Of teeth of driven gear=5

Velocity ratio=No. of teeth of driver gear/No. of teeth of driven gear

Velocity ratio => 15/5=3:1.

8. What is the torque offered by a gear, if the tangential force is 10N and radius of the gear is 0.5m?

a) 5Nm

b) 15Nm

c) 10Nm

d) 2.55Nm

View Answer

Explanation: Given:

Tangential force=10N

Radius of the gear=0.5m

Torque=tangential force (F)*Radius(R)

Torque=10*0.5 => 5Nm.

9. What is the radius of a gear, if torque generated by the gear is 20Nm and the tangential force is 5N?

a) 5m

b) 4m

c) 10m

d) 2m

View Answer

Explanation: 4m is the radius of a gear, if torque generated by the gear is 20Nm and the tangential force is 5N. Since the formula for torque(T) is tangential force (F)*Radius(R), so radius=Torque(T)/Tangential force(F) which gives radius = 20Nm/5m => 4m.

10. What is the module of a gear if its pitch diameter is 15mm and it contains 3 teeth?

a) 2

b) 3

c) 4

d) 5

View Answer

Explanation: Given:

Pitch diameter = 15mm

No. Of teeth=3 teeth

Module=Pitch diameter/No. Of teeth

Module=>15/3=5.

11. What is the velocity ratio of two gears if the driver gear has 20 teeth and driven gear has 10 teeth?

a) 2:1

b) 3:2

c) 4:3

d) 5:1

View Answer

Explanation: Given:

No. Of teeth of driver gear=20

No. Of teeth of driven gear=10

Velocity ratio=No. of teeth of driver gear/No. of teeth of driven gear

Velocity ratio => 20/10=2:1.

12. What is the speed ratio of two gears if the speed of the driver gear has 20 km/hr and driven gear has 10km/hr?

a) 2:1

b) 3:2

c) 4:3

d) 5:1

View Answer

Explanation: Given:

Speed of the driver gear=20km/hr

Speed of the driven gear = 10km/hr

Speed ratio=speed of the driver gear/speed of the driven gear

Speed ratio=>20/10=2:1.

13. What is the speed ratio of two gears if the speed of the driver gear has 25 km/hr and driven gear has 10km/hr?

a) 2:1

b) 3:2

c) 4:3

d) 5:2

View Answer

Explanation: Given:

Speed of the driver gear=25km/hr

Speed of the driven gear = 10km/hr

Speed ratio=speed of the driver gear/speed of the driven gear

Speed ratio=>25/10=5:2.

14. What is the train value of a gear train if the velocity ratio is 2:5?

a) 2:1

b) 3:2

c) 4:3

d) 5:2

View Answer

Explanation:

Given: velocity ratio=2:5

Train value=1/(velocity ratio)

Train value=1/(2:5)=5:2.

15. What is the train value of a gear train if the velocity ratio is 2:1?

a) 2:1

b) 1:2

c) 4:3

d) 5:2

View Answer

Explanation:

Given: velocity ratio=2:1

Train value=1/(velocity ratio)

Train value=1/(2:1)=1:2.

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