electrical

Switchgear and Protection MCQ Objective Questions and Answers Page - 8

1.

The method of neutral grounding affects the

Answer/ Hint      

Answer : C

Explanation :

2.

The earth transformer is used to

Answer/ Hint      

Answer : B

Explanation :

3.

In an isolated neutral system, when a single line to ground fault occurs

Answer/ Hint      

Answer : D

Explanation :

4.

The voltage of a particular bus is regulated by controlling the

Answer/ Hint      

Answer : B

Explanation :

5.

In ac distribution system the voltage can be controlled by using

Answer/ Hint      

Answer : D

Explanation :

6.

The changing transformers are employed for

Answer/ Hint      

Answer : D

Explanation :

7.

The best location for use of a booster transformer in a transmission line is

Answer/ Hint      

Answer : C

Explanation :

8.

For voltage control in ac distribution system the induction regulators have the advantage(s) of

Answer/ Hint      

Answer : D

Explanation :

9.

Series capacitor is used in a transmission line to

Answer/ Hint      

Answer : A

Explanation :

10.

Shunt compensation in an  EHV  line is used to improve

Answer/ Hint      

Answer : B

Explanation :

11.

_____________  are used provide compensation at the receiving end of a transmission line so as to improve its voltage profile.

Answer/ Hint      

Answer : A

Explanation :

12.

What will happen if a short-circuit fault occurs in a switched capacitor controlled reactor  ?

Answer/ Hint      

Answer : A

Explanation :

13.

An AC capacitor is to be switched in parallel with  AC  line using back to back connected thyristor. What is the firing angle of thyristor for first switching ?

Answer/ Hint      

Answer : C

Explanation :

14.

In between the generating station (power house) and consumers a number of transformation and switching stations exist, these are called the

Answer/ Hint      

Answer : B

Explanation :

15.

Which of the following is provided with arcing horns  ?

Answer/ Hint      

Answer : B

Explanation :

16.

Pole mounted substations are used in

Answer/ Hint      

Answer : D

Explanation :

17.

With large reactance interconnector between two power stations

Answer/ Hint      

Answer : A

Explanation :

18.

AC network analyser is employed for solving the problem of

Answer/ Hint      

Answer : D

Explanation :

19.

Power system stability is defined as

Answer/ Hint      

Answer : A

Explanation :

20.

Steady-state stability of a power system is the ability of the power system to

Answer/ Hint      

Answer : D

Explanation :

21.

Transient disturbances are caused by

Answer/ Hint      

Answer : D

Explanation :

22.

Transient stability of a  3-phase  power systems having more than one synchronous generator is not affected by which one of the following specifications  ?

Answer/ Hint      

Answer : D

Explanation :

23.

The power transmission capacity of a transmission line is

Answer/ Hint      

Answer : B

Explanation :

24.

The load carrying capability of a long ac transmission line is

Answer/ Hint      

Answer : B

Explanation :

25.

Maximum power will be transferred from the sending end to the receiving end by a transmission line when

Answer/ Hint      

Answer : C

Explanation :

26.

The stability of the power system is not affected by

Answer/ Hint      

Answer : C

Explanation :

27.

The power systems are operated with power angle around

Answer/ Hint      

Answer : B

Explanation :

28.

Which of the following statements is true  ?

Answer/ Hint      

Answer : A

Explanation :

29.

The methods employed in improving the system stability are

Answer/ Hint      

Answer : D

Explanation :

30.

Series capacitors are used to

Answer/ Hint      

Answer : A

Explanation :

31.

A 2-pole, 50 Hz, 11 kV, 100 MW alternator has a moment of inertia of  10,000 kg.m2. the value of inertia constant,  H is

Answer/ Hint      

Answer : D

Explanation :

32.

In a multimachine interconnected system, subsequent to a  3-phase  fault, the transient stability is examined by

Answer/ Hint      

Answer : B

Explanation :

33.

Equal-area criterion is employed to determine  :

Answer/ Hint      

Answer : B

Explanation :

34.

Equal area criteria in power systems is used in the context of

Answer/ Hint      

Answer : B

Explanation :

35.

For what value of damping parameter, the transient stability is assured by equal area criterion  ?

Answer/ Hint      

Answer : B

Explanation :

36.

Critical clearing angle is related to

Answer/ Hint      

Answer : A

Explanation :

37.

For a fault in a power system, the term clearing time is related to

Answer/ Hint      

Answer : B

Explanation :

38.

For which one of the following types of motors, is the equal-area criterion for stability applicable  ?

Answer/ Hint      

Answer : A

Explanation :

39.

The transient stability limit of a power system can be appreciably increased by introducing

Answer/ Hint      

Answer : C

Explanation :

40.

The initial accelerating power  (in pu)  will be

Answer/ Hint      

Answer : C

Explanation :

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