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Electric Circuits

Electric Circuits
Which of the following are the passive elements?

 Resistor
 Both
 None of these.
 Bulb

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Electric Circuits
When power factor angle is varying, the shape of the current locus is

 Semicircle
 Straight line
 Circle
 Triangle

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Electric Circuits
A variable capacitance is one whose capacitance

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

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Electric Circuits
If one cycle of AC waveform occurs every millisecond, the frequency will be

 10 kHz.
 100 Hz.
 50 Hz.
 1000 Hz.

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Electric Circuits
Phase voltages of a star connected alternator are ER = 240∠0o V, EY = 240∠-120o V and EB = 240∠ + 120o V. What is the phase sequence of the system?

 BYR.
 RBY.
 YBR.
 RYB.

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Electric Circuits
In RLC parallel circuit to get Q>1 which of the following is required?

 XL
 XL=R
 XL>R
All of these

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