Explore topic-wise MCQs in Electromagnetic Theory.

This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Electromagnetic Theory knowledge and support exam preparation. Choose a topic below to get started.

1.

The inductance of a coaxial cable with inner radius a and outer radius b, from a distance d, is given bya) L = μd ln(b/a)/2πb) L = 2π μd ln(b/a)c) L = πd/ln(b/

A. L = μd ln(b/a)/2π
B. L = 2π μd ln(b/a)
C. L = πd/ln(b/a)
D. L = 0
Answer» B. L = 2π μd ln(b/a)
2.

Find the inductance of a coil with turns 50, flux 3 units and a current of 0.5A

A. 150
B. 300
C. 450
D. 75
Answer» C. 450
3.

Calculate the mutual inductance of two tightly coupled coils with inductances 49H and 9H.

A. 21
B. 58
C. 40
D. 49/9
Answer» B. 58
4.

THE_INDUCTANCE_OF_A_COAXIAL_CABLE_WITH_INNER_RADIUS_A_AND_OUTER_RADIUS_B,_FROM_A_DISTANCE_D,_IS_GIVEN_BY?$

A. L = μd ln(b/a)/2π
B. L = 2π μd ln(b/a)
C. L = πd/ln(b/a)
D. L = 0
Answer» B. L = 2‚âà√¨‚àö√ë ‚âà√≠¬¨‚à´d ln(b/a)
5.

FIND_THE_INDUCTANCE_OF_A_COIL_WITH_TURNS_50,_FLUX_3_UNITS_AND_A_CURRENT_OF_0.5A?$

A. 150
B. 300
C. 450
D. 75
Answer» C. 450
6.

Calculate the mutual inductance of two tightly coupled coils with inductances 49H and 9H?

A. 21
B. 58
C. 40
D. 49/9
Answer» B. 58
7.

The inductance is proportional to the ratio of flux to current. State True/False.

A. True
B. False
Answer» B. False
8.

With unity coupling, the mutual inductance will be

A. L1 x L2
B. L1/L2
C. ‚àö(L1 x L2)
D. L2/L1
Answer» D. L2/L1
9.

A coil is said to be loosely coupled with which of the following conditions?

A. K>1
B. K<1
C. K>0.5
D. K<0.5
Answer» E.
10.

The equivalent inductance of two coils with series opposing flux having inductances 7H and 2H with a mutual inductance of 1H.

A. 10
B. 7
C. 11
D. 13
Answer» C. 11
11.

The expression for the inductance in terms of turns, flux and current is given by

A. L = N dφ/di
B. L = -N dφ/di
C. L = Niφ
D. L = Nφ/i
Answer» B. L = -N d‚âà√¨‚àö√∫/di
12.

The equivalent inductances of two coils 2H and 5H in series aiding flux with mutual inductance of 3H is

A. 10
B. 30
C. 1
D. 13
Answer» E.
13.

Calculate the emf of a coil with turns 100 and flux rate 5 units.

A. 20
B. -20
C. 500
D. -500
Answer» E.