In an ac circuit, the current is given by i=5sin100tπ2 and the ac potential is V = 200 sin(100t) volt. The power consumption is:

1. 20 W

2. 40 W

3. 1000 W

4. 0 

Subtopic:  Power factor |
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A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply. The net power consumed over a full cycle is:

1. 484 W

2. 848 W

3. 400 W

4. 786 W

Subtopic:  Power factor |
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A coil of inductive reactance of 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitive reactance 25 Ω. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is:

1. 0.56

2. 0.64

3. 0.80

4. 0.33

Subtopic:  Power factor |
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The power factor of the given circuit is:
           
1. 122. 123. 324. 0

Subtopic:  Power factor |
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The power factor of a series LCR circuit in resonance condition is:

1. zero 2. 123. 124. 1

Subtopic:  Power factor |
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The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. What is the power factor of this circuit?

1. 0.4             

2. 0.5

3. 0.8             

4. 1.0

Subtopic:  Power factor |
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An inductor of inductance L and resistor of resistance R are joined in series and connected by a source of frequency ω. The power dissipated in the circuit is:

1. (R2+ω2L2)V

2. V2R(R2+ω2L2)

3. V(R2+ω2L2)

4. R2+ω2L2V2

Subtopic:  Power factor |
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In a series LCR circuit, the current through the ac source is 2 A. If resistor R has a resistance of 10 Ω, the average power dissipated in the circuit is:

1. 20 W

2. 30 W

3. 10 W

4. 40 W

Subtopic:  Power factor |
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What is the average power dissipated in the ac circuit if current i = 100sin100t A and V=100sin(100t+π/3) volts?

1. 2500 W

2. 250 W

3. 5000 W

4. 4000 W

Subtopic:  Power factor |
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A circuit consists of 3 ohms of resistance and 4 ohms of reactance. The power factor of the circuit is:

1. 0.4

2. 0.6

3. 0.8

4. 1.0

Subtopic:  Power factor |
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