Design of Electrical Machines Mock Test 4

10%

Question 1 of 10

1. What among the following is the advantages of the star connection?

eliminates triple frequency harmonics

eliminates single frequency harmonics

eliminates sinusoidal harmonics

eliminates double frequency harmonics

Question 1 of 10

Question 2 of 10

2. What factor does the rotor body depends upon in the construction of hydro-generators?

peripheral voltage

voltage

speed

power

Question 2 of 10

Question 3 of 10

3. What is the rating of the engine driven generators?

750 MW

700 MW

1000 MW

20 MW

Question 3 of 10

Question 4 of 10

4. Why are the slip rings made use of?

they are used to reduce the losses

they are used to provide excitation to the armature windings

they are used to reduce the heating effects

they are used to provide excitation to field windings

Question 4 of 10

Question 5 of 10

5. How is the hydro-generator driven by?

internal combustion engines

control of reactive power networks

water turbine

steam turbine

Question 5 of 10

Question 6 of 10

6. The pulsation losses are caused by the direct axis pulsation of magnetic flux.

true

false

Question 6 of 10

Question 7 of 10

7. How many categories can the synchronous motors be divided into?

Question 7 of 10

Question 8 of 10

8. The synchronous motors are cheaper than the induction motors.

false

true

Question 8 of 10

Question 9 of 10

9. What is the relation between the magnetizing current and power factor?

magnetizing current is directly proportional to the square of the power factor

magnetizing current is indirectly proportional to the power factor

magnetizing current is indirectly proportional to the square of the power factor

magnetizing current is directly proportional to the power factor

Question 9 of 10

Question 10 of 10

10. At what angle with respect to the interpolar axis does the flux tube gives a good approximation?

90°

30°

60°

45°

Question 10 of 10