electrical

Magnetic Circuit MCQ Questions and Answers

1.

An air gap is usually inserted in magnetic circuits to

Answer/ Hint      

Answer : C

Explanation :

2.

The relative permeability of a ferromagnetic material is

Answer/ Hint      

Answer : D

Explanation :

3.

The unit of magnetic flux is

Answer/ Hint      

Answer : B

Explanation :

4.

Permeability of a magnetic circuit corresponds to………. In an electrical circuit

Answer/ Hint      

Answer : C

Explanation :

5.

Point out the wrong statement.

Magnetic leakage is undesirable inn electric machine because it

Answer/ Hint      

Answer : A

Explanation :

6.

The magnetising force (H) and magnetic flux density (B) are connected by the relation

Answer/ Hint      

Answer : B

Explanation :

7.

Permanent magnets are normally made of

Answer/ Hint      

Answer : A

Explanation :

8.

Energy stored by a coil is doubled when its current is increased by ………. percent.

Answer/ Hint      

Answer : C

Explanation :

9.

Those magnetic materials are best suited for making armature and transformer cores which have …. permeability and …… hysteresis loss.

Answer/ Hint      

Answer : C

Explanation :

10.

The rate of rise of current through an inductive coil is maximum

Answer/ Hint      

Answer : B

Explanation :

11.

When both the inductance and resistance of the coil are doubled the value of

Answer/ Hint      

Answer : A

Explanation :

12.

The initial rate of rise of current through a coil of inductance 10H when suddenly connected to a D.C. supply of 200v is …… A/s

Answer/ Hint      

Answer : B

Explanation :

13.

A material for good magnetic memory should have

Answer/ Hint      

Answer : D

Explanation :

14.

Conductivity is analogous to

Answer/ Hint      

Answer : C

Explanation :

15.

In a magnetic material hysteresis loss takes place primarily due to

Answer/ Hint      

Answer : D

Explanation :

16.

Those materials are well suited for making permanent magnets which have ……. retentivity and ………. Coercivity.

Answer/ Hint      

Answer : B

Explanation :

17.

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be

Answer/ Hint      

Answer : C

Explanation :

18.

Hard steel is suitable for making permanent magnets because

Answer/ Hint      

Answer : A

Explanation :

19.

Silicon steel is used in electrical machines because it has

Answer/ Hint      

Answer : C

Explanation :

20.

Conductance is analogous to

Answer/ Hint      

Answer : A

Explanation :

21.

The property of a material which opposes the creation of magnetic flux in int is known as

Answer/ Hint      

Answer : D

Explanation :

22.

The unit of retentivity is

Answer/ Hint      

Answer : B

Explanation :

23.

Reciprocal of reluctance is

Answer/ Hint      

Answer : B

Explanation :

24.

While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit?

Answer/ Hint      

Answer : B

Explanation :

25.

The unit of reluctance is

Answer/ Hint      

Answer : D

Explanation :

26.

A ferrite core has less eddy current loss than an iron core because

Answer/ Hint      

Answer : D

Explanation :

27.

A ferromagnetic core subjected to cycles of magnetisation will exhibit hysteresis when the cycle is

Answer/ Hint      

Answer : D

Explanation :

28.

In order to minimise loss due to hysteresis, the magnetic material should have

Answer/ Hint      

Answer : B

Explanation :

29.

Hysteresis loss least depends on

Answer/ Hint      

Answer : D

Explanation :

30.

Laminated cores, in electrical machines are used to reduce

Answer/ Hint      

Answer : B

Explanation :

31.

The area of hysteresis loss is a measure of

Answer/ Hint      

Answer : C

Explanation :

32.

Permeance is to reluctance as conductance is to

Answer/ Hint      

Answer : D

Explanation :

33.

According to steinmetz hysteresis law, hysteresis loss in a material is proportional to

Answer/ Hint      

Answer : B

Explanation :

34.

The transformer cores operating at microwave frequency range, are usually made of

Answer/ Hint      

Answer : D

Explanation :

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