Electrical Engineering Mcqs Practice Test

Question 1

The wooden poles well impregnated with creosite oil or any preservative compound have life_____________?

Accepted Answer

C. 25 to 30 years

Question 2

If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as___________________?

Accepted Answer

A. Kelvin’s law

Question 3

Overhead system can be designed for operation up to____________?

Accepted Answer

D. 400 kV

Question 4

The underground system cannot be operated above_________________?

Accepted Answer

D. 66 kV

Question 5

_______________are the conductors, which connect the consumer’s terminals to the distribution?

Accepted Answer

B. Service mains

Question 6

By which of the following systems electric power may be transmitted ?

Accepted Answer

C. Both A. and (b)

Question 7

When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?

Accepted Answer

A.  Current will flow to earth

Question 8

The skin effect of a conductor will reduce as the__________?

Accepted Answer

A.  resistivity of conductor material increases

Question 9

The following system is not generally used?

Accepted Answer

A.  1-phase 3 wire

Question 10

When a conductor carries more current on the surface as compared to core, it is due to___________?

Accepted Answer

C.  skin effect

Question 11

The voltage regulation in magnetic amplifier type voltage regulator is effected by__________?

Accepted Answer

C.  varying the reactance

Question 12

Series capacitors on transmission lines are of little use when the load VAR requirement is___________?

Accepted Answer

B.  small

Question 13

Electro-mechanical voltage regulators are generally used in___________?

Accepted Answer

B.  generators

Question 14

The angular displacement between two interconnected stations is mainly due to___________?

Accepted Answer

A.  armature reactance of both alternators

Question 15

When an alternator connected to the bus-bar is shut down the bus-bar voltage will___________?

Accepted Answer

C.  remain unchanged

Question 16

The frequency of voltage generated, in case of generators, can be increased by___________?

Accepted Answer

C.  adjusting the governor

Question 17

When the interconnector between two stations has large reactance?

Accepted Answer

C.  the stations will fall out of step be¬cause of large angular displacement between the stations

Question 18

In the analysis of which of the following lines shunt capacitance is neglected?

Accepted Answer

A.  Short transmission lines

Question 19

For transmission of power over a distance of 500 km, the transmission voltage should be in the range?

Accepted Answer

A.  150 to 220 kV

Question 20

The effect of corona can be detected by___________?

Accepted Answer

D.  all of the above