Electrical Engineering Mcqs Practice Test

Question 1

The under voltage relay can be used for______________?

Accepted Answer

E.  all of the above

Question 2

For which of the following protection from negative sequence currents is provided ?

Accepted Answer

A.  Generators

Question 3

Bus coupler is very essential in arrangement______________?

Accepted Answer

C.  main and transfer bus

Question 4

Which of the following statements is incorrect ?

Accepted Answer

A.  Lightning arrestors are used before the switchgear

Question 5

For cost and safety, the outdoor substations are installed for voltages above_________________?

Accepted Answer

B.  33 kV

Question 6

Short-circuit currents are due to_______________?

Accepted Answer

E.  any of these

Question 7

A.C. network analyser is used to solve problems of_______________?

Accepted Answer

D.  load flow, short-circuit and stability

Question 8

To reduce short circuit fault currents are used_____________?

Accepted Answer

A.  reactors

Question 9

Induction cup relay is operated due to changes in________________?

Accepted Answer

D.  all of the above

Question 10

When a wave propagates on a transmission line, it suffers reflection several times at_____________?

Accepted Answer

D.  sending and other end

Question 11

The reflection co-efficient at the open circuited end of a transmission line___________?

Accepted Answer

C.  unity

Question 12

The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to______________?

Accepted Answer

C.  extinguish the arc

Question 13

H.R.C. fuses provide best protection against________________?

Accepted Answer

D.  short-circuits

Question 14

To protect most of the electrical equipment handling low power, the types of relays used are______________?

Accepted Answer

C.  both (A)  and (B)

Question 15

Which of the following is the least expensive protection for overcurrent is low voltage system ?

Accepted Answer

A.  Rewireable fuse

Question 16

Insulation resistance of high voltage circuit breakers is more than________________?

Accepted Answer

C.  100 mega ohms

Question 17

The delay fuses are used for the protection of ___________?

Accepted Answer

A.  motors

Question 18

The time of closing the cycle, in modern circuit breakers is_____________?

Accepted Answer

A.  0.003 sec

Question 19

For the protection of power station buildings against direct strokes the requirements are___________?

Accepted Answer

C.  interception, conduction and dissipation

Question 20

Wave trap is used to trap waves of__________________?

Accepted Answer

B.  higher frequencies entering generator or transformer units