Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 40

Score
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Weekly Quiz Competition

Question 1
4 / -1

In L – R circuit, for the case of increasing current, the magnitude of current can be calculated by using the formula

A

B

C

D
Question 2
4 / -1

The current through choke coil increases from zero to 6 A in 0.3 seconds and an induced e.m.f. of 30 V is produced. The inductance of the coil of choke is

A
5 H

B
2.5 H

C
1.5 H

D
2 H

Solution
Question 3
4 / -1

A coil of N = 100 turns carries a current I = 5 A and creates a magnetic flux ɸ =10^–5 Tm^–2 per turn. The value of its inductance L will be

A
0.05 mH

B
0.10 mH

C
0.15 mH

D
0.20 mH

Solution
Question 4
4 / -1

Two identical induction coils each of inductance L joined in series are placed very close to each other such that the winding direction of one is exactly opposite to that of the other. What is the net inductance

A
L²

B
2L

C
L /2

D
Zero

Solution
Question 5
4 / -1

The adjoining figure shows two bulbs B₁ and B₂, resistor R and an inductor L. When the switch S is turned off

A
Both B₁ and B₂ die out prodietly

B
Both B₁ and B₂ die out with some delay

C
B₁ dies out promptly but B₂ with some delay

D
B₂ dies out promptly but B₁ with some delay
Question 6
4 / -1

If a current of 5 A in a coil of self-inductance 2 mH is cut off in time 0.1 s, the induced e.m.f. in the coil is

A
0.1 V

B
0.01 V

C
0.2 V

D
0.02 V

Solution
Question 7
4 / -1

Which types of losses do not occur in the transformer?

A
Iron losses

B
Copper losses

C
Mechanical losses

D
Flux leakage
Question 8
4 / -1

An AC generator of 220 V having internal resistance r = 10 Ω and external resistance R= 100 Ω. What is the power developed in the external circuit

A
484 W

B
400 W

C
441 W

D
369 W

Solution
Question 9
4 / -1

In step-up transformer, relation between number of turns in primary (N_p) and number of turns in secondary (N_s) coils is

A
N_s is greater than N_p

B
N_p is greater than N_s

C
N_s is equal to N_p

D
N_p = 2N_s
Question 10
4 / -1

The pointer of a dead-beat galvanometer gives a steady deflection becauses

A
Eddy currents are produced in the conducting frame over which the coil is wound

B
Its magnet is very strong

C
Its pointer is very light

D
Its frame is made of abonite