Alternating Current Test

Result

Alternating Current Test - 24

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Weekly Quiz Competition

Question 1
4 / -1

A series R–L–C circuit, driven with E _rms = 120 V at frequency 50 Hz, contains an inductance with X _L =100 Ω, a capacitance with X_C =110Ω and an unknow resistance R. For what value of R, the power factor is 0.9?

A
20Ω

B
42Ω

C
59Ω

D
110Ω

Solution
Question 2
4 / -1

A capacitor .50g is connected to a power source V = 220 sin 50t (V in volt, t in second). The value of rms current (in ampere)

A

B
0.55 A

C

D

Solution
Question 3
4 / -1

An emf of 15 V is applied in a circuit containing 5 H inductance, 10Ω resistance. The ratio of currents at time t = ∞ and t = 1 is

A

B

C

D

Solution
Question 4
4 / -1

In the given circuit, the AC source has co = 100 rad /s. Considering the inductor and capacitor to be ideal, the correct choice(s) is (are)

A
The current through the circuit, I is 0.3 A

B
The current through the circuit, I is 0.3 √2 A

C
The voltage across 100 Ω resistor =10√2 V

D
The voltage across 50 Ω resistor =10 V

Solution
Question 5
4 / -1

A
10 mA

B
20 mA

C
40 mA

D
80 mA

Solution
Question 6
4 / -1

A
5.0 W

B
2.5 W

C
1.25 W

D
zero

Solution
Question 7
4 / -1

The instantaneous voltage through a device of impedance 20 Ω is e = 80 sin 100πt. The effective value of the current is

A
3 A

B
2.828 A

C
1.732 A

D
4 A

Solution
Question 8
4 / -1

A
10 V

B
5√3 V

C
5 V

D
1 V

Solution
Question 9
4 / -1

A circuit area 0.01 m² is kept inside a magnetic field which is normal to its plane. The magnetic field changes from 2 T to 1 T in 1 ms. If the resistance of the circuit is 2Ω. The amount of heat evolved is

A
0.05 J

B
50 J

C
0.50 J

D
500 J

Solution
Question 10
4 / -1

The time taken by AC of 50 Hz in reaching from zero to the maximum value is

A
50 × 10^-3 s

B
5 × 10^-3 s

C
1 × 10^-3 s

D
2 × 10^-3 s

Solution