Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 10

Score
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Weekly Quiz Competition

Question 1
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 2
4 / -1

The turn ratio of a transformer is 1 : 2. An electrolytic DC cell of emf 2 V is connected to its primary. The output voltage across transformer is

A
zero

B
4 V

C
2.4 V

D
12 V
Question 3
4 / -1

Quantity that remains unchanged in a transformer is

A
voltage

B
current

C
frequency

D
None of these
Question 4
4 / -1

Energy required to establish a current of 4 A in a coil of self inductance L= 200 mH is

A
0.16 J

B
0.18 J

C
0.40 J

D
1.6 J

Solution
Question 5
4 / -1

In 0.1s, the current in a coil increases from 1 A to 1.5 A. If inductance of coil is 60 mH, then induced current in external resistance of 3 Ω will be

A
1 A

B
0.5 A

C
0.2 A

D
0.1 A

Solution
Question 6
4 / -1

Induced emf in the coil depends upon

A
conductivity of coil

B
amount of flux

C
rate of change of linked flux

D
resistance of coil

Solution
Question 7
4 / -1

A solenoid of inductance 2 H carries a current 1 A. What is the magnetic energy stored in a solenoid ?

A
2 J

B
1 J

C
4 J

D
5 J

Solution
Question 8
4 / -1

Magnetic flux of 10 μWb is linked with a coil, when a current of 2mA flows through it. What is the self inductance of the coil ?

A
10 mH

B
5 mH

C
15 mH

D
20 mH

Solution
Question 9
4 / -1

What should be the value of self inductance of an inductor that should be connected to 220 V, 50 Hz supply, so that a maximum current of 0.9 A flows through it ?

A
11 H

B
2 H

C
1.1 H

D
5 H

Solution
Question 10
4 / -1

When the current changes from + 2 A to -2 A in 0.05 s, an emf of 8V is induced in a coil. The coefficient of self induction of the coil is

A
0.2 H

B
0.4 H

C
0.8 H

D
0.1 H

Solution