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Electric Circuits

Electric Circuits
The rms value of the voltage U(t)= 3 + 4cos(3t)

  4.123 V.
 7 V.
  5 V.
 {3 + 2(1.141)} V.

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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

 0.4.
 0.6.
 0.85.
 0.9.

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Electric Circuits
The capacitive reactance of an electric circuit is 50 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 200 Ohms.
 50 Ohms.
 100 Ohms.
 25 Ohms.

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Electric Circuits
When power factor angle is varying, the shape of the current locus is

 Straight line
 Triangle
 Circle
 Semicircle

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Electric Circuits
A two port network is defined by the relation The value of Z12 is

 3.
 2/31.
 3/41.
 -3.

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Electric Circuits
When 125 V is applied across a 250 V, 100 W filament incandescent bulbs, the power consumption is

 25 W.
 100 W.
 50 W.
 12.5 W.

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