Alternating Current Test

Result

Alternating Current Test - 19

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Weekly Quiz Competition

Question 1
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
Capacitive

C
Inductive

D
None of these

Solution
Question 2
4 / -1

In a series LCR circuit, resistance R = 100 Ω and the impedance Z = 20 Ω. The phase difference between the current and the voltage is

A
30°

B
45°

C
60°

D
90°

Solution
Question 3
4 / -1

An LC circuit contains a 20 mH inductor and a 50 μF capacitor with an initial charge of 10 mC. The resistance of the circuit is negligible. At the instant the circuit is closed be t = 0. At what time is the energy stored completely magnetic

A
t = 0

B
t = 1.54 ms

C
t = 3.14 ms

D
t = 6.28 ms

Solution
Question 4
4 / -1

An ideal choke draws a current of 8 A when connected to an ac supply of 100 V, 50 Hz. A pure resistor draws a current of 10 A when connected to the same source. The ideal choke and the resistor are connected in series and then connected to the ac source of 150 V, 40 Hz. The current in the circuit becomes

A

B
8 A

C
18 A

D
10 A

Solution
Question 5
4 / -1

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

A
2 A

B
3.3 A

C

D

Solution
Question 6
4 / -1

A
30 Hz

B
60 Hz

C
75 Hz

D
50 Hz

Solution
Question 7
4 / -1

Power factor is maximum in an LCR circuit when

A
X_L = X_C

B
R = 0

C
X_L = 0

D
X_C = 0

Solution
Question 8
4 / -1

A resistance of 40 ohm and an inductance of 95.5 millihenry are connected in series in a 50 cycles/second ac circuit. The impedance of this combination is very nearly

A
30 ohm

B
40 ohm

C
50 ohm

D
60 ohm

Solution
Question 9
4 / -1

A
50 μF

B
25 μF

C
100 μF

D
75 μF

Solution
Question 10
4 / -1

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

A
R /ωt

B
R /(R²+ ω²L²)^1/2

C
ωL /R

D
R /(R² - ω²L²)^1/2

Solution