Alternating Current Test

Result

Alternating Current Test - 11

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Weekly Quiz Competition

Question 1
4 / -1

In a L-C-R series circuit, the potential difference between the terminals of the inductance is 60 V, between the terminals of the capacitor is 30 V and that across the resistance is 40 V. Then, supply voltage will be equal to the

A
50 V

B
70 V

C
130 V

D
10 V

Solution
Question 2
4 / -1

The natural frequency of an L-C circuit is 125000 cycle/s. Then the capacitor C is replaced by another capacitor with a dielectric medium of dielectric constant K. In this case, the frequency decreases by 25 kHz. The value of K is

A
3.0

B
2.1

C
1.56

D
1.7

Solution
Question 3
4 / -1

Average power generated in an inductor connected to an AC source is

A
1/2 Li²

B
Li²

C
zero

D
None of these
Question 4
4 / -1

In a series L-C-R circuit, resistance R =10Ω and the impedance Z =10Ω. The phase difference between the current and the voltage is

A
0°

B
30°

C
45°

D
60°

Solution
Question 5
4 / -1

A circuit consists of an inductance of 0.5 mH and a capacitor of 20 µF. The frequency of the L-C oscillations is approximately

A
400 Hz

B
88 Hz

C
1600 Hz

D
2400 Hz

Solution
Question 6
4 / -1

An inductor is connected to an AC source. When compared to voltage, the current in the lead wires

A
Is ahead in phase by π

B
Lags in phase by π

C

D

Solution
Question 7
4 / -1

A circuit has a resistance of 12 Ω and an impedance of 15 Ω. The power factor of the circuit will be

A
0.8

B
0.4

C
1.25

D
0.125

Solution
Question 8
4 / -1

The phase difference between the alternating current and emf is π/2 . Which of the following cannot be the constituent of the circuit?

A
C alone

B
R, L

C
L, C

D
L alone
Question 9
4 / -1

If the capacity of a condenser is 1 F, then its resistance in a DC circuit will be

A
zero

B
infinity

C
1 Ω

D
1/2 Ω

Solution
Question 10
4 / -1

An L-C-R circuit of R =100Ω is connected to an AC source 100 V, 50 Hz. The magnitude of phase difference between current and voltage is 30°. The power dissipated in the L-C-R circuit is

A
50 W

B
86.6 W

C
100 W

D
200 W

Solution