As per Faraday’s laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it

lies perpendicular to the magnetic flux

moves parallel to the direction of the magnetic field

Higher the self-inductance of a coil,

longer the delay in establishing steady current through it

greater the flux produced by it

longer the delay in establishing steady current through it

In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will

initially increase and then decrease

infinite resistance and zero inductance

infinite resistance and normal inductance

zero resistance and high inductance

If current in a conductor increases then according to Lenz’s law self-induced voltage will

produce current opposite to the in-creasing current

tend to decrease the amount of cur-rent

produce current opposite to the in-creasing current

The magnitude of the induced e.m.f. in a conductor depends on the

rate of change of flux-linkages

flux density of the magnetic field

rate of change of flux-linkages

Mutually inductance between two magnetically-coupled coils depends on

cross-sectional area of their common core

For a purely inductive circuit which of the following is true ?

Actual power of the circuit is zero

Any capacitance even if present in the circuit will not be charged

The co-efficient of coupling between two air core coils depends on

mutual inductance and self inductance of two coils

self-inductance of two coils only

mutual inductance between two coils only

mutual inductance and self inductance of two coils

A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by

variation in voltage to the coil

change of number of turns of coil

the resistance of magnetic path

Electromagnetic Induction Electrical Engineering MCQ Questions and Answers PDF Quiz

13.

A laminated iron core has reduced eddy-current losses because

more wire can be used with less D.C. resistance in coil

the laminations are insulated from each other

the magnetic flux is concentrated in the air gap of the core

the laminations are stacked vertfcally

1. The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as

2. As per Faraday’s laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it

3. Which of the following circuit element stores energy in the electromagnetic field ?

4. Higher the self-inductance of a coil,

5. In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will

6. An open coil has

7. Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be

8. If current in a conductor increases then according to Lenz’s law self-induced voltage will

9. The direction of induced e.m.f. can be found by

10. Air-core coils are practically free from

11. The magnitude of the induced e.m.f. in a conductor depends on the

12. Mutually inductance between two magnetically-coupled coils depends on

13. A laminated iron core has reduced eddy-current losses because

14. The law that the induced e.m.f. and current always oppose the cause producing them is due to

15. Which of the following is not a unit of inductance ?

16. In case of an inductance, current is proportional to

17. Which of the following circuit elements will oppose the change in circuit current ?

18. For a purely inductive circuit which of the following is true ?

19. Which of the following is unit of inductance ?

20. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be

21. The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

22. The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is

23. Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be

24. A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be

25. Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be

26. In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be

27. A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is

28. Lenz’s law is a consequence of the law of conservation of

29. A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly

30. Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla.

31. The co-efficient of coupling between two air core coils depends on

32. An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is

33. A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?

34. Which of the fpllowing inductor will have the least eddy current losses ?

35. A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is

36. Two 300 uH coils in series without mutual coupling have a total inductance of

37. Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is

38. Which circuit element(s) will oppose the change in circuit current ?

39. A crack in the magnetic path of an inductor will result in

40. A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by

Time

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1.

The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as

2.

As per Faraday’s laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it

3.

Which of the following circuit element stores energy in the electromagnetic field ?

4.

Higher the self-inductance of a coil,

5.

In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will

6.

An open coil has

7.

Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be

8.

If current in a conductor increases then according to Lenz’s law self-induced voltage will

9.

The direction of induced e.m.f. can be found by

10.

Air-core coils are practically free from

11.

The magnitude of the induced e.m.f. in a conductor depends on the

12.

Mutually inductance between two magnetically-coupled coils depends on

13.

A laminated iron core has reduced eddy-current losses because

14.

The law that the induced e.m.f. and current always oppose the cause producing them is due to

15.

Which of the following is not a unit of inductance ?

16.

In case of an inductance, current is proportional to

17.

Which of the following circuit elements will oppose the change in circuit current ?

18.

For a purely inductive circuit which of the following is true ?

19.

Which of the following is unit of inductance ?

20.

An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be

21.

The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

22.

The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is

23.

Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be

24.

A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be

25.

Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be

26.

In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be

27.

A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is

28.

Lenz’s law is a consequence of the law of conservation of

29.

A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly

30.

Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla.

31.

The co-efficient of coupling between two air core coils depends on

32.

An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is

33.

A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a flux change of 0.06 Wb occur to produce such a voltage ?

34.

Which of the fpllowing inductor will have the least eddy current losses ?

35.

A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is

36.

Two 300 uH coils in series without mutual coupling have a total inductance of

37.

Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is

38.

Which circuit element(s) will oppose the change in circuit current ?

39.

A crack in the magnetic path of an inductor will result in

40.

A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by