Electric Drives Mock Test 1

10%

Question 1 of 10

1. Among the following which one exhibits linearly rising load torque characteristics?

Fan load

Rolling Mills

Separately excited dc generator connected to the resistive load

Elevators

Question 1 of 10

Question 2 of 10

2. What is the formula for the active power in the cylindrical rotor synchronous machine? (E_b represents armature emf, V_t represents terminal voltage, δ represents rotor angle, X represents reactance)

E_b²×V_t×sinδ÷X

E_b×V_t×sinδ÷X2

E_b×V_t×sinδ÷X

E_b×V_t²×sinδ÷X

Question 2 of 10

Question 3 of 10

3. What is the unit of the apparent or complex power?

Volt

ohm

VAR

Question 3 of 10

Question 4 of 10

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

True

False

Question 4 of 10

Question 5 of 10

5. The unit of current is Tesla.

True

False

Question 5 of 10

Question 6 of 10

6. Armature reaction is demagnetizing in nature due to purely lagging load.

False

True

Question 6 of 10

Question 7 of 10

7. Servo motors are an example of which type of load?

Impact loads

Short time loads

Pulsating loads

Short time intermittent loads

Question 7 of 10

Question 8 of 10

8. Rolling mills exhibit what type of load torque characteristics?

Linearly rising torque characteristics

Non-Linearly rising torque characteristics

Constant torque characteristics

Non-Linearly decreasing torque characteristics

Question 8 of 10

Question 9 of 10

9. 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 ___________

700 V

690 V

730 V

740 V

Question 9 of 10

Question 10 of 10

10. For large DC machines, the yoke is usually made of which material?

Cast iron

Iron

Cast steel

Cast steel or cast iron

Question 10 of 10