Electrical Engineering Mcqs Practice Test

Question 1

In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is_______________?

Accepted Answer

B. 12 mA

Question 2

Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately___________?

Accepted Answer

C. 1.8 A

Question 3

Three lights are connected in parallel across a 120 volt source. If one light burns out_____________?

Accepted Answer

D. the remaining two will glow with the same brightness as before

Question 4

When an additional resistor is connected across an existing parallel circuit, the total resistance____________?

Accepted Answer

D. decreases

Question 5

Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 Ω, the current through each parallel resistor is____________?

Accepted Answer

C. 6.25 mA

Question 6

The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is_____________?

Accepted Answer

B. 7 A

Question 7

If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is_________________?

Accepted Answer

B. 70 mA

Question 8

The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is________________?

Accepted Answer

B. 4.8 W

Question 9

The size of the earth or ground wire is based on the______________?

Accepted Answer

D. both (A) and (C)

Question 10

Generally grounding is provided for

Accepted Answer

C. both (A) and (B)

Question 11

Factors on which soil resistance depends_______________?

Accepted Answer

D. all the above

Question 12

The objective of earthing or grounding is_______________?

Accepted Answer

A. to provide as low resistance possible to the ground

Question 13

For an EHV equipment for maintenance first it should be isolated and connected to ground because_____________?

Accepted Answer

D. both (B) and (C)

Question 14

When the 3-phase system is not grounded and if Single Line to Ground fault occurs, the voltage of the other two healthy phases will____________?

Accepted Answer

A. Increases

Question 15

Moisture content in the soil __________ the earth soil resistance?

Accepted Answer

B. decrease

Question 16

When earth fault occurs______________?

Accepted Answer

A. voltage potential at the earth mat increases due to grounding

Question 17

Ground resistance should be designed such that_____________?

Accepted Answer

A. grounding resistance should be as low as possible

Question 18

Average resistance of human body is____________?

Accepted Answer

B. 1000 ohms

Question 19

Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons ?

Accepted Answer

C. Both (A)  and (B)

Question 20

It is desirable to operate the arc furnaces at power factor of_____________?

Accepted Answer

B. 0.707 lagging