Electrical Engineering Mcqs Practice Test

Question 1

In a low power factor wattmeter the compensating coil is connected_______________?

Accepted Answer

C. in series with pressure coil

Question 2

An induction wattmeter can be used for_________________?

Accepted Answer

B. D.C. only

Question 3

A dynamometer wattmeter can be used for______________?

Accepted Answer

A. both D.C. and A.C.

Question 4

The multiplier and the meter coil in a voltmeter are in________________?

Accepted Answer

A. series

Question 5

For measuring current at high frequency we should use_______________?

Accepted Answer

C. thermocouple instrument

Question 6

The pressure coil of a wattmeter should be connected on the supply side of the current coil when______________?

Accepted Answer

A. load impedance is high

Question 7

The adjustment of position of shading bands, in an energy meter is done to provide______________?

Accepted Answer

A. friction compensation

Question 8

For measuring a very high resistance we should use_______________?

Accepted Answer

C. Meggar

Question 9

The operating voltage of a meggar is about_______________?

Accepted Answer

D. 100 V

Question 10

When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is____________?

Accepted Answer

B. all right

Question 11

In order to achieve high accuracy, the slide wire of a potentiometer should be_______________?

Accepted Answer

A. as long as possible

Question 12

A direct current can be measured by________________?

Accepted Answer

B. a D.C. potentiometer in conjunction with a standard resistance

Question 13

Which of the following devices should be used for accurate measurement of low D.C. voltage  ?

Accepted Answer

B. D.C. potentiometer

Question 14

To measure a resistance with the help of a potentiometer it is_________________?

Accepted Answer

B. not necessary to standardise the potentiometer

Question 15

The electrical power to a meggar is provided by________________?

Accepted Answer

B. permanent magnet D.C. generator

Question 16

It is required to measure the true open circuit e.m.f. of a battery. The best device is_____________?

Accepted Answer

C. D.C. potentiometer

Question 17

An ohmmeter is a____________?

Accepted Answer

B. moving coil instrument

Question 18

Murray loop test can be used for location of________________?

Accepted Answer

C. both the ground fault and the short-circuit fault

Question 19

In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was___________?

Accepted Answer

A. unity

Question 20

Which of the following is an essential part of a motor meter  ?

Accepted Answer

D. All of the above