Inductance in DC Circuit MCQ [Free PDF] – Objective Question Answer for Inductance in DC Circuit Quiz

81. The flux linkage in coil 1 is 3Wb and it has x turns and the current in coil 2 is 2A, calculate the value of x if the mutual inductance is 750H.

A. 300
B. 400
C. 500
D. 700

Answer: C

We know that mutual inductance is the product of the number of turns in one coil and the flux linkages of that coil, divided by the current in the other coil.

N = 750 × 2/3 = 500 turns.

 

82. The flux linkage in coil 1 is x and it has 500 turns and the current in coil 2 is 2A, calculate the value of x if the mutual inductance is 750H.

A. 1Wb
B. 2Wb
C. 3Wb
D. 4Wb

Answer: C

We know that mutual inductance is the product of the number of turns in one coil and the flux linkages of that coil, divided by the current in the other coil.

φ = 750 × 2/500 = 3Wb.

 

83. The flux linkage in coil 1 is 3 Wb and it has 500 turns and the current in coil 2 is xA, calculate the value of x if the mutual inductance is 750H.

A. 1A
B. 2A
C. 3A
D. 4A

Answer: B

We know that mutual inductance is the product of the number of turns in one coil and the flux linkages of that coil, divided by the current in the other coil.

I = 3 × 500/750 = 2A.

 

84. Practical application of mutual inductance is __________

A. DC generator
B. AC generator
C. Transformer
D. Capacitor

Answer: C

A transformer is a device made of two or more inductors, one of which is powered by AC, inducing an AC voltage across the second inductor.

 

85. The types of inductors are _______

A. Fixed and variable
B. Only fixed
C. Only variable
D. Neither fixed nor variable

Answer: A

The two types of inductors are fixed and variable inductors. Fixed inductors are those whose inductance value cannot be changed. Variable inductors are those whose values can be changed as and when required.

 

86. What is the coupling coefficient when all the flux of coil 1 links with coil 2?

A. 0
B. 100
C. 1
D. Insufficient information provided

Answer: C

When all the flux of coil 1 links with coil 2 it is known as an ideal coupling where the coupling coefficient is 1.

 

87. What is the coupling coefficient when there is ideal coupling?

A. 0
B. 100
C. 1
D. Insufficient information provided

Answer: C

When all the flux of coil 1 links with coil 2 it is known as an ideal coupling where the coupling coefficient is 1.

 

88. Can the coupling coefficient practically ever be equal to 1?

A. Yes
B. No
C. Depends on the current in coil 1
D. Depends on the current in coil 2

Answer: B

All the flux of coil 1 can never link with coil 2. Loss occurs practically due to which coupling coefficient cannot be equal to 1.

 

89. Mutual inductance between two coupled coils depends on?

A. Amount of flux linkage
B. Rate of change of flux linkage
C. Rate of change of current
D. Flux density

Answer: B

Faraday’s law of induction states that the magnitude of the induced EMF is the product of the number of turns of the coil and the rate of change of flux linkage in it. Hence, the mutual inductance depends on the rate of change of flux linkage.

 

90. Which among the following is the correct formula to find the coupling coefficient?

A. k = M/√(L1L2)
B. k = M/√(L12)
C. k = M/√(L22)
D. k = M/(L1L2)

Answer: A

The correct formula for the coupling coefficient is k = M/√(L1L2). Where L1 and L2 are the inductance values of the first and second coil respectively and M is the mutual inductance.

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