Alternating Current Test

Result

Alternating Current Test - 20

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Weekly Quiz Competition

Question 1
4 / -1

There is a 5Ω resistance in an ac circuit. Inductance of 0.1 H is connected with it in series. If equation of ac e.m.f. is 5 sin 50t, then the phase difference between current and e.m.f. is

A

B

C

D
0

Solution
Question 2
4 / -1

In LCR circuit the pd between the terminals of the inductance is 60V, between the terminals of the capacitor is 30V and that between the terminals of resistance is 40V, The supply voltage will be equal to

A
50 V

B
70 V

C
130 V

D
10 V

Solution
Question 3
4 / -1

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

A
4L

B
2L

C
L /2

D
L /4

Solution
Question 4
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 (zero)

Solution
Question 5
4 / -1

An inductance of (200/π) mH, a capacitance of (10^{̶ 3}/π)F and a resistance of 10Ω are connected inseries with an ac source 220 V, 50 Hz. The phase angleof the circuit is

A
π/6

B
π/4

C
π/2

D
π/3

Solution
Question 6
4 / -1

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

A
A₁

B
A₂

C
A₃

D
None of these
Question 7
4 / -1

Which of the following components of an LCR circuit, with as supply, dissipates energy

A
L

B
R

C
C

D
All of these
Question 8
4 / -1

In a choke coil, the reactance X_L and resistance R are such that

A
X_L = R

B
X_L>> R

C
X_L << R

D
X_L = oo

Solution
Question 9
4 / -1

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

A
LC

B
L alone

C
C alone

D
R, L
Question 10
4 / -1

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

A
40 V

B
250 V

C

D

Solution