Electromagnetic Induction Test

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Electromagnetic Induction Test - 20

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Weekly Quiz Competition

Question 1
4 / -1

The instantaneous voltage through a device of impedance 20Ω is ε = 80 sin100πt . The effective value of the current is,

A
3A

B
2.828 A

C
1.732 A

D
4A
Question 2
4 / -1

A choke coil has.

A
High inductance and low resistance

B
Low inductance and high resistance

C
High inductance and high resistance

D
Low inductance and low resistance
Question 3
4 / -1

A 20 volts ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is,

A
16 volts

B
10 volts

C
8 volts

D
6 volts
Question 4
4 / -1

The impedance of a circuit consists of 3Ω resistance and 4Ω reactance. The power factor of the circuit is.

A
0.4

B
0.6

C
0.8

D
1.0
Question 5
4 / -1

A coil of inductance L has an inductive reactance of X_L in an AC circuit in which the effective current is I. The coil is made from a super-conducting material and has no resistance. The rate at which power is dissipated in the coil is.

A
0

B
IX_L

C
I²X_L

D
Question 6
4 / -1

Two identical incandescent light bulbs are connected as shown in figure. when the circuit is an AC voltage source of frequency f, which of the following observations will be correct.

A
both bulbs will glow alternatively

B

C
Bulb b₁ will light up initially and goes off, bulb b₂ will be ON constantly.

D
Bulb b₁ will blink and bulb b₂ will be ON constantly.
Question 7
4 / -1

For high frequency, a capacitor offers

A
More reactance

B
Less reactance

C
Zero reactance

D
Infinite reactance
Question 8
4 / -1

The coil of a choke in a circuit

A
increase the current

B
Decrease the current

C
Does not change the current

D
Has high resistance to bc circuit
Question 9
4 / -1

In a LCR circuit capacitance is changed from C to 2C. For the resonant fequency to remain unchanged, the inductance should be change from L to

A
4L

B
2L

C
L/2

D
L/4
Question 10
4 / -1

In an LCR series ac circuit the voltage across each of the components L, C and R is 50 V. The voltage across the LC combination will be

A
50 V

B
50√2 V

C
100 V

D
0 V (zero)

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Re-Attempt Weekly Quiz Competition

Electromagnetic Induction Test - 20

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Electromagnetic Induction Test - 20

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Question 1

3A

2.828 A

1.732 A

4A

Question 2

High inductance and low resistance

Low inductance and high resistance

High inductance and high resistance

Low inductance and low resistance

Question 3

16 volts

10 volts

8 volts

6 volts

Question 4

0.4

0.6

0.8

1.0

Question 5

0

IXL

I2XL

Question 6

both bulbs will glow alternatively

Bulb b1 will light up initially and goes off, bulb b2 will be ON constantly.

Bulb b1 will blink and bulb b2 will be ON constantly.

Question 7

More reactance

Less reactance

Zero reactance

Infinite reactance

Question 8

increase the current

Decrease the current

Does not change the current

Has high resistance to bc circuit

Question 9

4L

2L

L/2

L/4

Question 10

50 V

50√2 V

100 V

0 V (zero)

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IX_L

I²X_L

Bulb b₁ will light up initially and goes off, bulb b₂ will be ON constantly.

Bulb b₁ will blink and bulb b₂ will be ON constantly.