Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 26

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

In the circuit shown below, the ac source has voltage v = 20 cosωt volts with ω = 2000 rad/sec. The amplitude of the current will be nearest to

A
2A

B
3.3 A

C

D
Question 2
4 / -1

The quality factor of LCR circuit having resistance (R) and inductance (L) at resonance frequency (ω) is given by

A

B

C

D
Question 3
4 / -1

The power factor of an ac circuit having resistance (R) and inductance (L) connected in series and an angular velocity w is,

A

B

C

D
Question 4
4 / -1

An inductor of inductance L and resistor of resistance R are joined in series and connected by a source of frequency ω power dissipated in the circuit is,

A

B

C

D
Question 5
4 / -1

An inductor L and capacitor C are connected in the circuit as shown in fig. The frequency of the power supply is equal to the resonant frequency of the circuit. Which ammeter will read zero ?

A
A₁

B
A₂

C
A₃

D
None of these
Question 6
4 / -1

In a circuit L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45^o. The value of c is,

A

B

C

D
Question 7
4 / -1

In a series resonant LCR circuit, the voltage across R is 100 V and R= 1kΩ with C = 2μF. The resonant frequency ω is 200 rad/s.At resonance the voltage across L is.

A
40V

B
250 V

C

D

Solution
Question 8
4 / -1

A coil of inductive reactance 31Ω has a resistance of 8Ω. It is placed in series with a condenser of capacitive reactance 25Ω. The combination is connected to an a.c. source of 110 volt. The power factor of the circuit is.

A
0.80

B
0.33

C
0.56

D
0.64
Question 9
4 / -1

The diagram shows a capacitor C and resistor R connected in series to an ac source. V₁ and V₂ are voltmeters and A is an ammeter, consider the following statements.
1. Readings in A and V₂ are always in phase
2. Reading in V₁ is ahead in phase with reading in V₂
3. Reading in A and V₁ are always in phase.
Which of these statements are is correct

A
only (1)

B
only (2)

C
(1) and (2) only

D
(2) and (3) only

Solution
Question 10
4 / -1

The reading of ammeter in the circuit shown will be

A
24 A

B
2.4 A

C
Zero

D
1.7 A

Solution