Electrical Engineering Mcqs Practice Test

Question 1

In AC.S.R. conductors, the insulation between aluminium and steel conductors is_________?

Accepted Answer

D.  no insulation is required

Question 2

A conductor, due to sag between two supports, takes the form of____________?

Accepted Answer

D.  catenary

Question 3

Transmission voltage of 11 kV is normally used for distances up to_____km?

Accepted Answer

A. 20—25 km

Question 4

Which of the following characteristics should the line supports for transmission lines possess?

Accepted Answer

D.  All of the above

Question 5

Which of the following distribution systems is more reliable?

Accepted Answer

C.  Ring main system

Question 6

The steel used in steel cored conductors is usually__________?

Accepted Answer

C.  mild steel

Question 7

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

Accepted Answer

B.  Mho’s relay

Question 8

Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?

Accepted Answer

D. Its secondary current is 20 A

Question 9

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?

Accepted Answer

A. hysteresis and eddy current losses

Question 10

Losses which occur in rotating electric machines and do not occur in transformers are___________?

Accepted Answer

A. friction and windage losses

Question 11

For given applied voltage, with the increase in frequency of the applied voltage?

Accepted Answer

C. eddy current loss will remain unchanged

Question 12

In a power or distribution transformer about 10 per cent end turns are heavily insulated__________?

Accepted Answer

A. to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns

Question 13

Reduction in core losses and increase in permeability are obtained with transformer employing__________?

Accepted Answer

A. core built-up of laminations of cold rolled grain oriented steel

Question 14

The noise produced by a transformer is termed as_______________________?

Accepted Answer

B. hum

Question 15

Which of the following parts of a transformer is visible from outside ?

Accepted Answer

A. Bushings

Question 16

Which of the following insulating materials can withstand the highest temperature safely ?

Accepted Answer

C. Mica

Question 17

The efficiency of two identical transformers under load conditions can be determined by_______________?

Accepted Answer

B. back-to-back test

Question 18

Which of the following acts as a protection against high voltage surges due to lightning and switching ?

Accepted Answer

A. Horn gaps

Question 19

A good voltage regulation of a transformer means________________?

Accepted Answer

A. output voltage fluctuation from no load to full load is least

Question 20

Which of the following protection is normally not provided on small distribution transformers ?

Accepted Answer

B. Buchholz relay