Electric Drives Mock Test 1

10%

Question 1 of 10

1. The unit of Magento-motive force is Ampere-turns.

False

True

Question 1 of 10

Question 2 of 10

2. Duty cycle (D) is _______

Ton÷2×Toff

Ton÷(Ton+ Toff)

Ton÷2×(Ton+ Toff)

Ton÷Toff

Question 2 of 10

Question 3 of 10

3. Torque is a scalar quantity.

True

False

Question 3 of 10

Question 4 of 10

4. What is the relationship between torque and speed in constant type loads?

Torque non-linearly decreases with an increase in speed

Torque non-linearly increases with an increase in speed

Torque is independent of speed

Torque linearly increases with increase in speed

Question 4 of 10

Question 5 of 10

5. Calculate the value of angular acceleration of motor using the given data: J = 20 kg-m², load torque = 20 N-m, motor torque = 60 N-m.

2 rad/s²

5 rad/s²

3 rad/s²

4 rad/s²

Question 5 of 10

Question 6 of 10

6. The generated e.m.f from 70-pole armature having 100 conductors driven at 10 rev/sec having flux per pole as 20 mWb, with wave winding is ___________

740 V

730 V

690 V

700 V

Question 6 of 10

Question 7 of 10

7. The slope of the I-V curve is 30°. Calculate the value of resistance. Assume the relationship between I and V is a straight line.

1.524 Ω

1.732 Ω

1.625 Ω

2.235 Ω

Question 7 of 10

Question 8 of 10

8. Calculate the power developed by motor using the given data: Eb = 20V and I = 10 A. (Assume rotational losses are neglected)

400 W

300 W

500 W

200 W

Question 8 of 10

Question 9 of 10

9. The slope of the V-I curve is 0°. Calculate the value of resistance. The graph is parallel to the x-axis.

1.8 Ω

0 Ω

2.2 Ω

1 Ω

Question 9 of 10

Question 10 of 10

10. If the starting torque of the motor is less than the load torque, the motor will fail to start.

True

False

Question 10 of 10