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Electric Circuits

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

 0.577.
 0.5.
 0.866.
 1.

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Electric Circuits
Mica capacitor are characterised by all of following except

 accurate value.
 stable operation.
 low leakage reactance.
 low losses.

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Electric Circuits
In parallel RLC circuit under resonance condition the value of current is

 Maximum
None of these
 Zero
 Minimum

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Electric Circuits
A constant voltage source has

 high internal resistance.
 low internal resistance.
 minimum current capacity.
 minimum efficiency.

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Electric Circuits
Current efficiency in electroplating is usually

  90 to 98 %.
  50 to 60 %.
  99 %.
  70 to 80 %.

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Electric Circuits
A 2m long conductor, carries a current of 50 A at a magnetic field of 100 × 10 − 3 T. The force on the conductor is

 10000 N.
 100 N.
 10 N.
 1000 N.

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