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Electric Circuits

Electric Circuits
Coating generally recommended for hard surfacing is

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

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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

 0.6.
 0.4.
 0.9.
 0.85.

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Electric Circuits
A 60 Hz frequency voltage would cause a bulb to turn on and off

 70 times per second.
 120 times per second.
 60 times per second.
 80 times per second.

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Electric Circuits
Addition of which of the following substance in electrolyte helps in producing bright finish?

 Any of above.
 Dextrol.
 Phenol.
 Glycerine.

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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.
 0.020.
 1.56.
 6.24.

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Electric Circuits
Two 1 kΩ, 1 W resistors are connected in series. Their combine resistance and wattage will be

 1 kΩ, 1 W.
 2 kΩ, 1 W.
 0.5 kΩ, 2 W.
 2 kΩ, 0.5 W.

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