electrical

Basic Electrical Engineering MCQ Questions With Answers Page - 3

1.

When the leg of parallel circuit is opened out the total current will be

Answer/ Hint      

Answer : C

Explanation :

2.

In a lamp load when more than one lamp are switched on the total resistance of the load

Answer/ Hint      

Answer : B

Explanation :

3.

Resistance of  220 V, 100 W lamp will be

Answer/ Hint      

Answer : C

Explanation :

4.

In the case of direct current

Answer/ Hint      

Answer : A

Explanation :

5.

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

Answer/ Hint      

Answer : B

Explanation :

6.

Resistance of carbon filament lamp …… as the applied voltage increases.

Answer/ Hint      

Answer : B

Explanation :

7.

Bulbs in street lighting are all connected in

Answer/ Hint      

Answer : A

Explanation :

8.

For testing appliances, the wattage of test lamp should be

Answer/ Hint      

Answer : C

Explanation :

9.

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

Answer/ Hint      

Answer : A

Explanation :

10.

Sparking occurs when a load is switched off because the circuit has high

Answer/ Hint      

Answer : B

Explanation :

11.

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

Answer/ Hint      

Answer : C

Explanation :

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

Answer/ Hint      

Answer : B

Explanation :

13.

A field of force can be exist between

Answer/ Hint      

Answer : B

Explanation :

14.

A substance whose molecules consists dissimilar atom is called

Answer/ Hint      

Answer : C

Explanation :

15.

A microvolt is

Answer/ Hint      

Answer : D

Explanation :

16.

Which of the following could be the value of resistivity of copper?

Answer/ Hint      

Answer : D

Explanation :

17.

International ohm is defined in terms of the resistance of

Answer/ Hint      

Answer : A

Explanation :

18.

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

Answer/ Hint      

Answer : B

Explanation :

19.

Which method can be used for absolute measurement of resistances?

Answer/ Hint      

Answer : D

Explanation :

20.

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

Answer/ Hint      

Answer : C

Explanation :

21.

Ohm’s law is not applicable to

Answer/ Hint      

Answer : A

Explanation :

22.

Specific resistance of a substance is measured in

Answer/ Hint      

Answer : C

Explanation :

23.

A nichrome wire used as a heater coil has the resistance of 2Ω/m. for a heater of 1 Kw at 200 V, the length of wire required will be

Answer/ Hint      

Answer : A

Explanation :

24.

Temperature co-efficient of resistance is expressed in terms of

Answer/ Hint      

Answer : C

Explanation :

25.

Which of the following materials has the least resistivity?

Answer/ Hint      

Answer : D

Explanation :

26.

Which of the following lamps will have least resistance at room temperature?

Answer/ Hint      

Answer : C

Explanation :

27.

Which resistor will be physically larger in size?

Answer/ Hint      

Answer : B

Explanation :

28.

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

Answer/ Hint      

Answer : C

Explanation :

29.

The condition for the validity under ohm’s law is that

Answer/ Hint      

Answer : A

Explanation :

30.

Which of the following statement is correct?

Answer/ Hint      

Answer : A

Explanation :

31.

A rheostat differs from potentiometer in the respect that it

Answer/ Hint      

Answer : B

Explanation :

32.

The weight of an aluminum conductor of identical cross-section, for the same electrical resistance is

Answer/ Hint      

Answer : A

Explanation :

33.

An open resistor, when checked with an ohm-meter reads

Answer/ Hint      

Answer : B

Explanation :

34.

_______________   are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.

Answer/ Hint      

Answer : C

Explanation :

35.

All good conductors have high

Answer/ Hint      

Answer : A

Explanation :

36.

Voltage dependent resistor are usually made from

Answer/ Hint      

Answer : C

Explanation :

37.

Voltage dependent resistors are used

Answer/ Hint      

Answer : B

Explanation :

38.

The ratio of mass of proton to that of the electron is nearly

Answer/ Hint      

Answer : A

Explanation :

39.

 The number of electrons in the outer most orbit of carbon atom is

Answer/ Hint      

Answer : B

Explanation :

40.

With three resistances connected in parallel, if each dissipates  20 W  the total power supplied by the voltage source equals

Answer/ Hint      

Answer : D

Explanation :

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