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Electric Circuits

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

 1.56.
 6.24.
 0.020.
 3.12.

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Electric Circuits
Resistance of which material does not change with change in temperature?

 Metal alloys constantan and manganin.
 Brass.
 Platinum.
 Tungsten.

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Electric Circuits
The rms value of the resultant current in a wire which carries a DC current of 10A and a sinusoidal current of peak value 20A is

 22.4A.
 14.14A.
 17.3A .
 30A.

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Electric Circuits
The terminals across the source are ___________ if a voltage source is to be neglected.

 replaced by a series resistance.
 short circuited.
 replaced by a shunt resistance.
 open circuited.

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Electric Circuits
Specific resistance is measured in

  mho.
  ohm - cm.
  ohm.
  ohm/cm.

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Electric Circuits
Phase voltages of a star connected alternator are ER = 240∠0o V, EY = 240∠-120o V and EB = 240∠ + 120o V. What is the phase sequence of the system?

 RBY.
 BYR.
 YBR.
 RYB.

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