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Electric Circuits

Electric Circuits
In the above question find the angle between voltage and current?

 54.74.
 30.
 60.
 90.

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Electric Circuits
A 3 – φ delta connected symmetrical load consumes P Watts of power from a balanced supply. If the same load is connected in star to the same supply then what is the power consumption?

 √3P.
 3P.
 P.
 P/3.

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Electric Circuits
An AC voltage of 200 V at 50 Hz is applied to a coil which draws 5 A and dissipates 1000 W. The resistance and impedance of the coil respectively are

 50 Ω and 200 Ω.
 40 Ω and 200 Ω.
 40 Ω and 40 Ω.
 25 Ω and 5 Ω.

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Electric Circuits
If emf in a given circuit is given by e = 100 sinω0t, then maximum value of voltage and frequency will be

 100 V, 50 Hz.
 100 V, 100 Hz.
 50√2 V, 100 Hz.
 100√2 V, 100 Hz.

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Electric Circuits
If a resistor is connected across the voltage source and the frequency of voltage and current wave form is 50Hz, then what is frequency of instantaneous power

 50 Hz.
 150 Hz.
 100 Hz.
 0 Hz.

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Electric Circuits
Which of following capacitors has relatively shorter shelf life?

 Electrolytic.
 Paper.
 both (B) and (C) above.
 Glass.

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