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Electric Circuits

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

 XL=R
All of these
 XL>R
 XL

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Electric Circuits
The synchronous speed for the seventh space harmonic mmf wave of 8 pole, 50 Hz induction machine will be

 5250 rpm in reverse direction.
 107.14 rpm in reverse direction.
 5250 rpm in forward direction.
 107.14 rpm in forward direction.

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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
An electric field can deflect

 alpha particles.
 x-rays.
 neutrons.
 gamma-rays.

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Electric Circuits
The capacitive reactance of an electric circuit is 50 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 25 Ohms.
 100 Ohms.
 200 Ohms.
 50 Ohms.

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Electric Circuits
If a function is shifted by 'T', then it is correctly represented as

 f (t-T) u (t).
 f (t) u (t).
 f (t-T) u (t-T).
 f (t) u (t-T).

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