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Electric Circuits

Electric Circuits
In series R, L circuit power factor can be defined as

 R/Z
 P/S
 Vr/V
All of these

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Electric Circuits
A 60 Hz frequency voltage would cause a bulb to turn on and off

 120 times per second.
 60 times per second.
 80 times per second.
 70 times per second.

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Electric Circuits
A variable capacitance is one whose capacitance

 can be changed manually or by mechanical force.
 changes with time.
 changes with voltage.
 changes with temperature.

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Electric Circuits
Which of the following quantities consists of SI unit as WATT ?

 Charge
 Force
 Power
 Current

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Electric Circuits
Which of the following elements is/are called dynamic element/s?

 L.
 C.
 Both L and C.
 R.

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Electric Circuits
A capacitor of 50 microfarad is connected in series with a resistance of 120 Ω. If above circuit is connected across 240 V, 50 Hz 1 - φ supply. Find the capacitive reactance?

 63.7 Ω.
 135.86 Ω.
 1.765 Ω.
 0.015 Ω.

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