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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?

 1.
 0.866.
 0.577.
 0.5.

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Electric Circuits
Emf induced in a coil rotating in a uniform magnetic field will be maximum when the

 rate of change of flux linkage is minimum.
 flux linking with the coil is maximum.
 rate of cutting flux by coil sides is minimum.
 rate of change of flux linkage is maximum.

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Electric Circuits
The internal resistance of a dry cell is of the order of

  2 to 5 Ohm.
  1 to 15 Ohm.
  1 to 1.5 Ohm.
  0.2 to 0.4 Ohm.

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Electric Circuits
Coating generally recommended for hard surfacing is

 chromium plating.
None of these
 lead plating.
 copper plating.

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Electric Circuits
Poles and zeros are arranged alternatively on imaginary axis, then type of network is?

 RL network
 LC network
 RC network
 Any of the above

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

 Maximum
None of these
 Minimum
 Zero

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