electrician

MCQ ON ALTERNATOR PAGE - 2

1.

Which type of alternator is used in hydroelectric power stations?

Answer/ Hint      

Answer : C

Explanation :

2.

The armature reaction effect in a synchronous machine depends on

Answer/ Hint      

Answer : D

Explanation :

3.

Skew of rotor bar eliminates

Answer/ Hint      

Answer : A

Explanation :

4.

The alternators are rated as

Answer/ Hint      

Answer : C

Explanation :

5.

The generated frequency in India is ….

Answer/ Hint      

Answer : D

Explanation :

6.

The relation between frequency speed and number of poles in Alternator is given as …

Answer/ Hint      

Answer : B

Explanation :

7.

A 10 Pole alternator rotates at a constant speed of 1200 rpm. The periodic time of voltage in seconds per cycle will be

Answer/ Hint      

Answer : A

Explanation :

8.

The field circuit of an alternator is supplied with

Answer/ Hint      

Answer : B

Explanation :

9.

The D.C and A.C generators are similar in one important function. That is the …

Answer/ Hint      

Answer : B

Explanation :

10.

Adjusting the speed of the prime mover of an alternator is primarily necessary. Which one of the following is the reason for this?

Answer/ Hint      

Answer : A

Explanation :

11.

Which one of the following is the reason for using dampers in large alternator work?

Answer/ Hint      

Answer : A

Explanation :

12.

The speed of a 6 pole 50 Hz of an alternator is

Answer/ Hint      

Answer : C

Explanation :

13.

The RMS value of emf induced per phase in alternator is given as…

(assuming Kd and Kc are constant)

Answer/ Hint      

Answer : Select Correct Ans

Explanation :

14.

A large diameter of alternator is running at slow speed will be having …

Answer/ Hint      

Answer : C

Explanation :

15.

A 3-phase star connected alternator having a rotating armature will have…

Answer/ Hint      

Answer : C

Explanation :

16.

A 3-phase, delta connected alternator having a rotating armature will have…

Answer/ Hint      

Answer : B

Explanation :

17.

A 3-phase, star connected alternator having a rotating armature will have 4 slip rings but 3 phase, delta connected alternator having armature will have

Answer/ Hint      

Answer : C

Explanation :

18.

In star connected alternator. If the line voltage is  What will be the p

Answer/ Hint      

Answer : D

Explanation :

19.

When all dark lamp method is used for synchronizing two 3-phase alternators, the lamps are not becoming dark at the same time but occurs at different timings. Bulbs used are of same wattage and vol

Answer/ Hint      

Answer : C

Explanation :

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