electrical

Transmission and Distribution MCQ Objective Questions and Answers Page - 4

1.

Which of the following is neglected while analysing a short transmission line  ?

Answer/ Hint      

Answer : A

Explanation :

2.

In modelling the equivalent circuit of a short length overhead transmission line, the line resistance and inductance are only considered because line capacitance to ground is

Answer/ Hint      

Answer : B

Explanation :

3.

Which of the following voltage regulation is considered to be the test  ?

Answer/ Hint      

Answer : A

Explanation :

4.

If in a short transmission line, resistance and inductive reactance are found to be equal and regulation appears to be zero, then the load will

Answer/ Hint      

Answer : C

Explanation :

5.

For a short line if the receiving-end voltage is equal to sending-end voltage under loaded conditions

Answer/ Hint      

Answer : D

Explanation :

6.

For an ac transmission line of length not exceeding 80 km, it is usual to lump the line capacitance at

Answer/ Hint      

Answer : B

Explanation :

7.

If L, C and Y are the inductance, capacitance and shunt admittance of a line per unit length, then for length .

Answer/ Hint      

Answer : A

Explanation :

8.

Transmission efficiency of a transmission line increases with the

Answer/ Hint      

Answer : B

Explanation :

9.

Under no-load conditions, the current in a transmission line is because of

Answer/ Hint      

Answer : A

Explanation :

10.

Which of the following statements are correct  ?

Answer/ Hint      

Answer : D

Explanation :

11.

In a long transmission line under no-load condition

Answer/ Hint      

Answer : B

Explanation :

12.

When is the Ferranti effect on long overhead lines experienced  ?

Answer/ Hint      

Answer : A

Explanation :

13.

Ferranti effect happens in transmission line when the line is

Answer/ Hint      

Answer : C

Explanation :

14.

The  ABCD constants of a  3-phase transposed transmission line with linear and passive elements

Answer/ Hint      

Answer : C

Explanation :

15.

The values of A, B, C and D constants for a short transmission line are respectively

Answer/ Hint      

Answer : C

Explanation :

16.

The angle of A, constant of the transmission line normally lies between

Answer/ Hint      

Answer : D

Explanation :

17.

For a transmission line with resistance  R, reactance X and negligible capacitance, the generalised constant  A  is

Answer/ Hint      

Answer : B

Explanation :

18.

For a medium length transmission line, A is

Answer/ Hint      

Answer : C

Explanation :

19.

For transmission line which one of the following relations is true  ?

Answer/ Hint      

Answer : A

Explanation :

20.

Which one of the following equations is CORRECT  ?

Answer/ Hint      

Answer : D

Explanation :

21.

The maximum efficiency in the transmission of bulk ac power will be achieved when the power factor of the load is

Answer/ Hint      

Answer : B

Explanation :

22.

A transmission line section shows an input impedance of  36 Ω  and  64 Ω respectively, when short circuited and open circuited. What is the characteristic impedance of the transmission line  ?

Answer/ Hint      

Answer : D

Explanation :

23.

The open-circuit and short-circuit impedances of a line are  100 Ω  each. What is the characteristic impedance of the line  ?

Answer/ Hint      

Answer : B

Explanation :

24.

A cable has inductance of  0.22 mH per  km  and capacitance of  0.202 μF per  km. the surge impedance of the cable is

Answer/ Hint      

Answer : B

Explanation :

25.

A  50 Ω  distortion less  transmission line has a capacitance of  10-10 F/m.  What its inductance per metre  ?

Answer/ Hint      

Answer : A

Explanation :

26.

Which of the following statements is correct  ?

Answer/ Hint      

Answer : B

Explanation :

27.

The characteristic impedance of a transmission line depends upon

Answer/ Hint      

Answer : C

Explanation :

28.

For a lossy transmission line, the characteristic impedance does  not  depend on

Answer/ Hint      

Answer : D

Explanation :

29.

In case the characteristic impedance of a transmission line is equal to the load impedance

Answer/ Hint      

Answer : B

Explanation :

30.

In a transmission line having negligible resistance, the surge impedance is

Answer/ Hint      

Answer : D

Explanation :

31.

Characteristic of an overhead line usually in the range of

Answer/ Hint      

Answer : C

Explanation :

32.

The Surge impedance of a  400 kV , 100 km transmission line is 300 ohms. For a  200 km  length the line Surge impedance will be

Answer/ Hint      

Answer : A

Explanation :

33.

A transmission line is distortion-less if

Answer/ Hint      

Answer : B

Explanation :

34.

When the load on a transmission line is equal to the surge impedance loading

Answer/ Hint      

Answer : C

Explanation :

35.

The SIL (Surge impedance loading) of a single circuit  220 kV  line is around

Answer/ Hint      

Answer : A

Explanation :

36.

What is the Surge impedance loading of a lossless  400 kV , 3-phase, 50 Hz  overhead line of average of Surge impedance of  400 ohms  ?

Answer/ Hint      

Answer : A

Explanation :

37.

A lossless radial transmission line with Surge impedance loading

Answer/ Hint      

Answer : C

Explanation :

38.

What does the standing wave ratio  (SWR)  of unity imply  ?

Answer/ Hint      

Answer : C

Explanation :

39.

Full-load compensation in a line requires

Answer/ Hint      

Answer : A

Explanation :

40.

Use of additional shunt capacitor can be made for increasing the capability of line as it

Answer/ Hint      

Answer : A

Explanation :

41.

The conductor of the overhead lines are

Answer/ Hint      

Answer : B

Explanation :

42.

High voltage transmission lines use

Answer/ Hint      

Answer : A

Explanation :

43.

Multicore cables generally use

Answer/ Hint      

Answer : D

Explanation :

44.

Distribution lines in India generally use

Answer/ Hint      

Answer : B

Explanation :

45.

The materials commonly used for insulation in high voltage cables is

Answer/ Hint      

Answer : B

Explanation :

46.

The loads on distributors systems are generally

Answer/ Hint      

Answer : B

Explanation :

47.

The power factor of industrial loads is generally

Answer/ Hint      

Answer : B

Explanation :

48.

Overhead lines generally use

Answer/ Hint      

Answer : C

Explanation :

49.

In transmission lines the cross-arms made of

Answer/ Hint      

Answer : D

Explanation :

50.

The material generally used for armour of high voltage cables is

Answer/ Hint      

Answer : B

Explanation :

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