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Electric Circuits

Electric Circuits
In the circuit shown below, what is the voltage across 5 Ω resistor?

 -27.4 V.
 -28.4 V.
 34.4 V.
 None of them

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Electric Circuits
In a capacitive circuit, the capacitive reactance is

 indirectly proportional to frequency
 directly proportional to frequency
 indirectly proportional to the square of frequency
 directly proportional to the square of 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

 0.4.
 0.6.
 0.9.
 0.85.

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Electric Circuits
An alternating voltage = 140 sinθ is supplied to a device which offers a resistance of 20 Ω in forward direction of current in reverse direction. Calculate the form factor.

 1.414.
 0.318.
 1.11.
 0.57.

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Electric Circuits
In series RLC circuit what is the power factor just bellow the resonance frequency?

 Leading
 Zero
 Lagging
 Unity

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Electric Circuits
The switch S is the circuit shown in figure is ideal. If the switch is repeatedly closed for 1 ms and opened for 1 ms, the average value of i(t) is

 0.35 mA.
 0.5 mA.
 1 mA.
  0.25 mA.

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