electrical

Transmission and Distribution MCQ Objective Questions and Answers Page - 7

1.

In a distribution system, which of the following items shares the major cost  ?

Answer/ Hint      

Answer : C

Explanation :

2.

The distribution in residential areas are

Answer/ Hint      

Answer : C

Explanation :

3.

The loads on 3-phase, 4-wire distribution are usually

Answer/ Hint      

Answer : B

Explanation :

4.

A uniformly loaded dc distributor is fed at both ends with equal voltages. In comparison to a similar distributor fed at one end only, the maximum voltage drop will be

Answer/ Hint      

Answer : A

Explanation :

5.

The null point of a uniformly loaded distributor fed at equal voltage at both ends lies at

Answer/ Hint      

Answer : A

Explanation :

6.

A uniformly loaded dc distributor is fed at both ends with equal voltages. In comparison to a similar distributor fed at one end only, the drop at the mid point will be

Answer/ Hint      

Answer : C

Explanation :

7.

When 7/o.o29 VIR cable is carrying  20 A, a drop of  1 V occurs every  12 m. the voltage drop in a  100 m  run of this cable when it is carrying  10 A  is nearly

Answer/ Hint      

Answer : A

Explanation :

8.

In a dc 3-wire distributor using balancers and having unequal loads on the two sides

Answer/ Hint      

Answer : D

Explanation :

9.

In a dc 3-wire distribution system, balancer fields are cross-connected in order to

Answer/ Hint      

Answer : A

Explanation :

10.

The booster

Answer/ Hint      

Answer : D

Explanation :

11.

The booster is inserted in the circuit to

Answer/ Hint      

Answer : D

Explanation :

12.

In order to reduce the inductive interference to parallel communication circuits to the minimum.

Answer/ Hint      

Answer : D

Explanation :

13.

Bundled conductors are used for  EHV  transmission lines primarily for reducing the

Answer/ Hint      

Answer : A

Explanation :

14.

The conductor of an EHV line is selected on the basis of

Answer/ Hint      

Answer : B

Explanation :

15.

Frequency of resonant vibrations lies in the range of

Answer/ Hint      

Answer : C

Explanation :

16.

On what basis is the insulation level of a  400 kV, EHV  overhead transmission line decided  ?

Answer/ Hint      

Answer : C

Explanation :

17.

A surge impedance of  10 kV  travels along a cable towards its junction with an overhead line. The surge impedance of the cable and the lines are  50 Ω  and  450 Ω,  respectively. the surge voltage transmitted into the line is

Answer/ Hint      

Answer : A

Explanation :

18.

Series capacitor is used in a transmission line to

Answer/ Hint      

Answer : A

Explanation :

19.

Series capacitive compensation in EHV transmission lines is used to

Answer/ Hint      

Answer : B

Explanation :

20.

Series capacitors can be used in distribution lines

Answer/ Hint      

Answer : A

Explanation :

21.

Shunt compensation in an EHV line is used to improve

Answer/ Hint      

Answer : C

Explanation :

22.

The most accurate and versatile method of achieving reactive power compensation is using

Answer/ Hint      

Answer : D

Explanation :

23.

Shunt reactors are sometimes used in high voltage transmission system to

Answer/ Hint      

Answer : C

Explanation :

24.

Insulation coordination for UHV lines (above 500 kV) is done based on

Answer/ Hint      

Answer : C

Explanation :

25.

At an industrial substation with a MW load, a capacitor of 2 MVAR is installed to maintain the load power factor at  0.97  lagging. If the capacitor goes out of service, the load power factor becomes

Answer/ Hint      

Answer : C

Explanation :

26.

For enhancing the power transmission in a long  EHV  transmission line, the most preferred method is to connect a

Answer/ Hint      

Answer : C

Explanation :

27.

A lossless transmission line having Surge Impedance Loading (SIL)  of  2280 MW  is provided with a uniformly distributed series capacitive compensation of  30%. Then, SIL of the compensated transmission line will be

Answer/ Hint      

Answer : C

Explanation :

28.

The following is not an advantage of dc transmission  :

Answer/ Hint      

Answer : D

Explanation :

29.

In an HVDC system  :

Answer/ Hint      

Answer : D

Explanation :

30.

In a dc transmission line

Answer/ Hint      

Answer : C

Explanation :

31.

High Voltage DC (HVDC) transmission is mainly used for

Answer/ Hint      

Answer : A

Explanation :

32.

Bulk power transmission over long High Voltage DC lines is preferred because of

Answer/ Hint      

Answer : C

Explanation :

33.

In the case of an HVDC system, there is

Answer/ Hint      

Answer : C

Explanation :

34.

Which one of the following statements in respect of High Voltage DC transmission line is not correct  ?

Answer/ Hint      

Answer : D

Explanation :

35.

The power transmission capability of bipolar lines is approximately

Answer/ Hint      

Answer : B

Explanation :

36.

The method used to implement an asynchronous link is

Answer/ Hint      

Answer : A

Explanation :

37.

High Voltage DC monopolar link use

Answer/ Hint      

Answer : A

Explanation :

38.

Back to back High Voltage DC is used to

Answer/ Hint      

Answer : C

Explanation :

39.

Which of the following will be provided to reduce the harmonics on ac side of an HVDC transmission line  ?

Answer/ Hint      

Answer : D

Explanation :

40.

In HVDC transmission there are predominant

Answer/ Hint      

Answer : A

Explanation :

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