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Electric Circuits

Electric Circuits
In which braking back emf exceeds supply voltage?

  Dynamic.
  Regenerative.
  Plugging.
  None of these.

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Electric Circuits
Which of the following may be the value of resistivity of copper at absolute zero in ohm-metre?

 3.12.
 6.24.
 1.56.
 0.020.

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Electric Circuits
What is the relation between time period T and frequency?

 T = frequency.
 T = 1 / frequency.
 T = 0.5 / frequency.
 T = 0.85 / frequency.

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Electric Circuits
In a 3 - φ delta connection, two-wattmeter method is used to measure the power; if the two watt meters read 28.13 kW and 13.31 kW, the power factor of connection will be

 0.9.
 0.4.
 0.6.
 0.85.

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Electric Circuits
From the circuit diagram shown in question 1 find the maximum power transferred to the load.

 1.875 W.
 4.547 W.
 15.247 W.
 9 W.

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Electric Circuits
A capacitor carries a charge of 0.1 C at 5 V. Its capacitance is

 0.05 F
 0.5 F
 0.2 F
 0.02 F

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