Alternating Current Test

Result

Alternating Current Test - 55

Score
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Weekly Quiz Competition

Question 1
4 / -1

The reading of ammeter in the circuit shown will be

A
2 A

B
2.4 A

C
Zero

D
1.7 A

Solution
Question 2
4 / -1

An ac source of angular frequency ω is fed across aresistor r and a capacitor C in series. The currentregistered is I. If the frequency of source is changed to ω /3 (maintaining the same voltage), the current in thecircuit is found to be halved. Calculate the ratio ofreactance to resistance at the original frequency ω

A

B

C

D

Solution
Question 3
4 / -1

Is it possible

A
Yes

B
No

C
Cannot be predicted

D
Insufficient data to reply

Solution
Question 4
4 / -1

A virtual current of 4 A and 50 Hz flows in an ac circuit containing a coil. The power consumed in the coil is 240 W. If the virtual voltage across the coil is 100 V its inductance will be

A

B

C

D

Solution
Question 5
4 / -1

In the adjoining ac circuit the voltmeter whose readingwill be zero at resonance is

A
V₁

B
V₂

C
V₃

D
V₄
Question 6
4 / -1

In the inductive circuit given in the figure, the current rises after the switch is closed. At instant when thecurrent is 15 mA, then potential difference across theinductor will be

A
Zero

B
240 V

C
180 V

D
60 V

Solution
Question 7
4 / -1

Which one of the following curves represents the variation of impedance (Z) with frequency f in series LCR circuit

A

B

C

D

Solution
Question 8
4 / -1

The variation of the instantaneous current (I) and the instantaneous e.m.f. (E) in a circuit is as shown in fig. Which of the following statement is correct?

A
The voltage lags behind the current by π /2

B
The voltage leads the current by π/2

C
The voltage and the current are in phase

D
The voltage leads the current by π

Solution
Question 9
4 / -1

The figure shows variation of R, X_L and X_C with frequency f in a series L, C, R circuit. Then for what frequency point, the circuit is inductive

A
A

B
B

C
C

D
All points

Solution
Question 10
4 / -1

An alternating e.m.f. is applied across a parallel combination of a resistance R, capacitance C and an inductance L. If I_R, I_L, I_Care the currents through R, L and C respectively, then the diagram which correctly represents the phase relationship among I_R, I_L, I_Cand source e.m.f. E, is given by

A

B

C

D

Solution