ELECTRIC CIRCUITS QUIZ

The active and reactive power in an AC circuit are 10W and 20VAR respectively. What is the power factor?

0.577.

0.866.

0.5.

1.

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A wire of resistance R has it length and cross - section both doubled. Its resistance will become

2R.

R.

0.5R.

4R.

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The greater the internal resistance of a cell

the greater the emf.

the lesser the terminal voltage.

the lesser the emf.

the greater the terminal voltage.

TRUE ANSWER : ?
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Energy efficiency during electroplating is usually in the range

50 to 80%.

90 to 99%.

85 to 90%.

80 to 85%.

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The power dissipated in a pure capacitor is

proportional to the value of capacitance.

zero.

both (B) and (C) above.

proportional to applied voltage.

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A 20 μF capacitor and 200 W, 220 V lamp is connected in series across a 220 V alternating supply. In which frequency of the supply the lamp will glow dimmest?

10 Hz.

1 Hz.

100 Hz.

1000 Hz.

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In the circuit shown in figure if I1 = 1.5 A, then I2 will be

2 A.

1.5 A.

0.5 A.

1 A.

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In steady state condition capacitor acts as a

short circuit

voltage source

current source

open circuit

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Which of the following is not a bilateral element?

Diode.

Capacitor.

Inductor.

Resistor.

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Consider the following circuit. What is the value of i ?

5 A.

- 5 A.

12 A.

6 A.

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