electrical

Transmission and Distribution MCQ Objective Questions and Answers Page - 6

1.

Cables used for  220 kV  lines are invariably

Answer/ Hint      

Answer : A

Explanation :

2.

The insulation use in a cable designed for use on  1,000 kV  is usually

Answer/ Hint      

Answer : B

Explanation :

3.

Sulphur hexafluoride cable is insulated by

Answer/ Hint      

Answer : D

Explanation :

4.

In compressed gas insulated cable  SF6  has the gas pressure in the range of

Answer/ Hint      

Answer : C

Explanation :

5.

At bridge crossings and near the railway track ternary lead cables are used because they

Answer/ Hint      

Answer : C

Explanation :

6.

Internal pressure cables have the advantage(s) of

Answer/ Hint      

Answer : D

Explanation :

7.

With the rise in temperature, the insulation resistivity

Answer/ Hint      

Answer : D

Explanation :

8.

The insulation resistance of a single-core cable is 200 MΩ/km. the insulation resistance for  5 km  length is

Answer/ Hint      

Answer : A

Explanation :

9.

The power factor of an open-ended cable can be improved by

Answer/ Hint      

Answer : D

Explanation :

10.

The capacitance of a cable increases

Answer/ Hint      

Answer : A

Explanation :

11.

The capacitance of a cable depends upon the

Answer/ Hint      

Answer : D

Explanation :

12.

The charring current drawn by the cable

Answer/ Hint      

Answer : B

Explanation :

13.

In underground cables, the electrostatic stress is

Answer/ Hint      

Answer : A

Explanation :

14.

In a cable of conductor diameter  ‘d’  and overall diameter with dielectric material  ‘D’  the maximum dielectric stress.

Answer/ Hint      

Answer : B

Explanation :

15.

To obtain the minimum value of stress in cable, the ratio  (R/r)  should be

Answer/ Hint      

Answer : B

Explanation :

16.

The surface impedance of a  50  miles long underground cable is  50 Ω. For a 25 miles length it will be

Answer/ Hint      

Answer : B

Explanation :

17.

The breakdown of insulation of a cable can be avoided economically by using

Answer/ Hint      

Answer : C

Explanation :

18.

Capacitance grading of cable means

Answer/ Hint      

Answer : C

Explanation :

19.

Grading of cables

Answer/ Hint      

Answer : A

Explanation :

20.

The intersheaths in cables are used to

Answer/ Hint      

Answer : A

Explanation :

21.

The desired overall diameter of the conductor without increasing its x-sectional area can be had by

Answer/ Hint      

Answer : D

Explanation :

22.

In a  3-core cable, the capacitance between two conductors  (with sheath earthed)  is  3 μF. The capacitance per phase will be

Answer/ Hint      

Answer : C

Explanation :

23.

Underground cables are laid at sufficient depth so as to

Answer/ Hint      

Answer : B

Explanation :

24.

In case the communication cables are to be laid parallel to power cables the distance between the two should  be at least so that there is no interference.

Answer/ Hint      

Answer : A

Explanation :

25.

While crossing the road the cable should be

Answer/ Hint      

Answer : C

Explanation :

26.

The source(s) of heat generation in cables  is/are

Answer/ Hint      

Answer : D

Explanation :

27.

A cable carrying ac has

Answer/ Hint      

Answer : C

Explanation :

28.

Dielectric hysteresis loss in a cable varies as

Answer/ Hint      

Answer : B

Explanation :

29.

The current carrying capacity of cables in dc is more than that in ac. It is mainly due to

Answer/ Hint      

Answer : A

Explanation :

30.

The fault(s) which are likely to occur in cables  is/are

Answer/ Hint      

Answer : D

Explanation :

31.

The lead sheath of the cable may get damaged due to

Answer/ Hint      

Answer : D

Explanation :

32.

The cables should not be operated too hot otherwise

Answer/ Hint      

Answer : D

Explanation :

33.

The breakdown voltage of a cable depends upon

Answer/ Hint      

Answer : D

Explanation :

34.

Breakdown of cable insulation may occur due to

Answer/ Hint      

Answer : D

Explanation :

35.

Fibre-optic cables are used in power system applications mainly for

Answer/ Hint      

Answer : D

Explanation :

36.

The main criterion for selection of the size of a distributor for a radial distribution system is

Answer/ Hint      

Answer : A

Explanation :

37.

The distribution system in India are mostly

Answer/ Hint      

Answer : A

Explanation :

38.

As per electricity regulations in India the maximum permissible voltage change at consumer premises should be

Answer/ Hint      

Answer : B

Explanation :

39.

The cost of material used in a distribution circuit per kVA  of distributed power varies as

Answer/ Hint      

Answer : B

Explanation :

40.

An approximate formula for loss factor in a distribution system is

Answer/ Hint      

Answer : A

Explanation :

41.

Which of the following is usually not the generating voltage?

Answer/ Hint      

Answer : B

Explanation :

42.

For an overhead line, the surge impedance is taken as

Answer/ Hint      

Answer : C

Explanation :

43.

The presence of ozone due to corona is harmful because it

Answer/ Hint      

Answer : B

Explanation :

44.

A feeder, in a transmission system, feeds power to

Answer/ Hint      

Answer : A

Explanation :

45.

The power transmitted will be maximum when

Answer/ Hint      

Answer : C

Explanation :

46.

A 3-phase 4 wire system is commonly used on

Answer/ Hint      

Answer : D

Explanation :

47.

Which of the following materials is used for overload transmission lines?

Answer/ Hint      

Answer : D

Explanation :

48.

Which of the following is not a constituent for making porcelain insulators?

Answer/ Hint      

Answer : D

Explanation :

49.

There is a greater possibility of occurrence of corona during

Answer/ Hint      

Answer : D

Explanation :

50.

Which of the following relays is used on long transmission lines?

Answer/ Hint      

Answer : B

Explanation :

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