Alternating Current Test

Result

Alternating Current Test - 50

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Weekly Quiz Competition

Question 1
4 / -1

When 100 volt dc is applied across a coil, a current of 1 amp flows through it. When 100 volt ac at 50 cycle s^–1 is applied to the same coil, only 0.5 ampere current flows. The impedance of the coil is

A
100 Ω

B
200 Ω

C
300 Ω

D
400 Ω

Solution
Question 2
4 / -1

The coefficient of inductor of a choke coil is 0.1 H and resistance is 12 Ω. If it is connected to an alternating current source of frequency 60 Hz, then power factor will be

A
0.32

B
0.30

C
0.28

D
0.24

Solution
Question 3
4 / -1

For series LCR circuit, wrong statement is

A
Applied e.m.f. and potential difference across resistance are in same phase

B
Applied e.m.f. and potential difference at inductor coil have phase difference of π /2

C
Potential difference at capacitor and inductor have phase difference of π/2

D
Potential difference across resistance and capacitor have phase difference of π/2
Question 4
4 / -1

In a purely resistive ac circuit, the current

A
Lags behind the e.m.f. in phase

B
Is in phase with the e.m.f.

C
Leads the e.m.f. in phase

D
Leads the e.mf. in half the cycle and lags behind it in the other half
Question 5
4 / -1

If an 8 Ω resistance and 6 Ω reactance are present in an ac series circuit, then the impedance of the circuit will be

A
20 ohm

B
5 ohm

C
10 ohm

D

Solution
Question 6
4 / -1

A 12 ohm resistor and a 0.21 henry inductor are connected in series to an ac source operating at 20 volts, 50 cycle/second. The phase angle between the current and the source voltage is

A
30°

B
40°

C
80°

D
90°

Solution
Question 7
4 / -1

What will be the phase difference between virtual voltage and virtual current, when the current in the circuit is wattless

A
90°

B
45°

C
180°

D
60°

Solution
Question 8
4 / -1

In the non-resonant circuit, what will be the nature of the circuit for frequencies higher than the resonant frequency

A
Resistive

B
Capactive

C
Inductive

D
None of these

Solution
Question 9
4 / -1

A 220 V, 50 Hz ac source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in the circuit?

A
10 A

B
5 A

C
33.3 A

D
3.33 A

Solution
Question 10
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