Electromagnetic Induction Test

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Electromagnetic Induction Test - 18

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Weekly Quiz Competition

Question 1
4 / -1

The self inductance of a straight conductor is...

A
zero

B
very large

C
very small

D
∞
Question 2
4 / -1

A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A.The impedance of device is.........

A
60Ω

B
50Ω

C
80Ω

D
100Ω
Question 3
4 / -1

The armature of dc motor has 20 Ω resistance. It draws current of 1.5 A when run by 220 V dc suppy. The value of back induced in it will be

A
150 V

B
190 V

C
170 V

D
180 V
Question 4
4 / -1

A square loop of side 5 cm being moved right at a constant speed 2 cms^–1. The front edge of it enters in magnetic field at t = 0.Fined the induced emf in the loop at t = 1s, 5s, 11s.

A
0.3 mv, 0.3 mv, 0.3mv

B
0, 0.3mv, 0

C
0.3 mv, 0, 0.3 mv

D
0, 0, 0
Question 5
4 / -1

In the following circuit the bulb will become suddenly bright if

A
contact is made

B
contanct is broken

C
contact is made or broken

D
Won't become bright at all
Question 6
4 / -1

The self inductance of a coil is 5H, a current of 1A changes to 2A within 5 sec. through the coil. The value of induced emf will be.......

A
10 V

B
0.1 V

C
1 V

D
100 V
Question 7
4 / -1

If rotational velocity of a dynamo armature is doubled, then induced emf will become... What is increased in step down transformer ?

A
Half

B
Two times

C
Four times

D
unchanged
Question 8
4 / -1

The core of a transformer is laminated so that.......

A
Ratio of I/p & O/p voltage increases

B
Rusting of core may be stopped

C
Energy loss due to eddy current may be reduced

D
Change in flux is increased
Question 9
4 / -1

In transformer, core is made of soft iron to reduce.....

A
Hysterlsis losses

B
Eddy current losses

C
Force opposing current

D
the weight
Question 10
4 / -1

An ideal transformer has 1:25 turn ratio. The peak value of the ac is 28 V. The rms ms secondary voltage is nearest to......

A
50 V

B
70 V

C
100 V

D
40 V

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Re-Attempt Weekly Quiz Competition

Electromagnetic Induction Test - 18

Result

Electromagnetic Induction Test - 18

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Rank

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SHARING IS CARING

Question 1

zero

very large

very small

∞

Question 2

60Ω

50Ω

80Ω

100Ω

Question 3

150 V

190 V

170 V

180 V

Question 4

0.3 mv, 0.3 mv, 0.3mv

0, 0.3mv, 0

0.3 mv, 0, 0.3 mv

0, 0, 0

Question 5

contact is made

contanct is broken

contact is made or broken

Won't become bright at all

Question 6

10 V

0.1 V

1 V

100 V

Question 7

Half

Two times

Four times

unchanged

Question 8

Ratio of I/p & O/p voltage increases

Rusting of core may be stopped

Energy loss due to eddy current may be reduced

Change in flux is increased

Question 9

Hysterlsis losses

Eddy current losses

Force opposing current

the weight

Question 10

50 V

70 V

100 V

40 V

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Score

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