Electrical Engineering Mcqs Practice Test

Question 1

When current flows through heater coil it glows but supply wiring does not glow because______________?

Accepted Answer

C. resistance of heater coil is more than the supply wires

Question 2

Temperature co-efficient of resistance is expressed in terms of___________?

Accepted Answer

C. ohms/ohm°C

Question 3

A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?

Accepted Answer

D. 20 m

Question 4

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?

Accepted Answer

D. 10 ohms

Question 5

Ohm’s law is not applicable to__________?

Accepted Answer

A. semi-conductors

Question 6

Which method can be used for absolute measurement of resistances _______________?

Accepted Answer

A. Lorentz method

Question 7

Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?

Accepted Answer

C. 4 Q

Question 8

Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?

Accepted Answer

B. 1/9 times

Question 9

International ohm is defined in terms of the resistance of________________?

Accepted Answer

A. a column of mercury

Question 10

A substance whose molecules consist of dissimilar atoms is called____________?

Accepted Answer

C. compound

Question 11

A field of force can exist only between_____________?

Accepted Answer

B. two ions

Question 12

When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will___________?

Accepted Answer

B. increase

Question 13

Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?

Accepted Answer

C. 9 times

Question 14

74. Sparking occurs when a load is switched off because the circuit has high_________?

Accepted Answer

B. inductance

Question 15

Switching of a lamp in house produces noise in the radio. This is because switching operation produces________?

Accepted Answer

A. arcs across separating contacts

Question 16

For testing appliances, the wattage of test lamp should be_____________?

Accepted Answer

C. high

Question 17

Bulbs in street lighting are all connected in_____________?

Accepted Answer

A. parallel

Question 18

When electric current passes through a bucket full of water, lot of bubbling is observeD.  This suggests that the type of supply is____________?

Accepted Answer

B. D. C.

Question 19

In the case of direct current____________?

Accepted Answer

A. magnitude and direction of current remains constant

Question 20

Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?

Accepted Answer

B. 40 W lamp will glow brighter