Electromagnetic Induction - Electrical Engineering (MCQ) questions and answers

1)   If the magnetic field is stationary and the conductor is in motion then the emf induced is called

a. Dynamically induced emf
b. Statically induced emf
c. Self induced emf
d. Mutually induced emf
Answer  Explanation 

ANSWER: Dynamically induced emf

Explanation:
No explanation is available for this question!
2)   The coefficient of coupling is given by

a. M / √(L2L1)
b. M / (L2 L1)
c. √(L2 L1) / M
d. (L2 L1) / M
Answer  Explanation 

ANSWER: M / √(L2L1)

Explanation:
No explanation is available for this question!
3)   The unit of magnetizing field intensity is

a. Newton / Weber
b. Ampere - turns / Weber
c. Newton - m / Weber
d. Only (a) and (b)
Answer  Explanation 

ANSWER: Only (a) and (b)

Explanation:
No explanation is available for this question!
4)   According to the couloumb’s second law, the force between two magnetic poles placed in a medium is

a. Directly proportional to their pole strengths.
b. Inversely proportional to the square of the distance between them
c. Inversely proportional to the absolute permeability of the surrounding medium
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
5)   The unit of magnetic flux is

a. Maxwell
b. Weber
c. Weber - m
d. Only (a) and (b)
Answer  Explanation 

ANSWER: Only (a) and (b)

Explanation:
No explanation is available for this question!
6)   Which among the following sentences is correct?

a. Lenz’s law is used to find the direction of induced current
b. Fleming’s right hand rule is used to find the direction of induced current
c. Fleming’s left hand rule is used to find the direction of force
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
7)   The induced emf sets up the direction of current in such a way that the magnetic field produced by it

a. Supports the cause producing it
b. Opposes the cause producing it
c. Increases
d. Decreases
Answer  Explanation 

ANSWER: Opposes the cause producing it

Explanation:
No explanation is available for this question!
8)   When the flux crosses the air gap, it bulges outward at the ends of the air gap and the flux density in the air gap is reduced. This is known as

a. Leakage flux
b. Fringing
c. Relative permeability
d. Magnetizing force
Answer  Explanation 

ANSWER: Fringing

Explanation:
No explanation is available for this question!
9)   Reluctance in a magnetic material is a property by virtue of which it opposes the creation of

a. Electric flux
b. Magnetic flux
c. Electric field density
d. Electric lines of force
Answer  Explanation 

ANSWER: Magnetic flux

Explanation:
No explanation is available for this question!
10)   Coulomb’s First Law states that

a. Unlike poles attract each other
b. Like poles repel each other
c. Unlike poles attract each other and like poles repel each other
d. The force between two magnetic poles placed in a medium directly proportional to their pole strengths
Answer  Explanation 

ANSWER: Unlike poles attract each other and like poles repel each other

Explanation:
No explanation is available for this question!

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