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Electric Circuits

Electric Circuits
2) Two sinusoidal emfs are given as e1 = Asin(wt+45) and e2 = Bsin(wt-30). The phase difference between the two quantities in degrees is

 105.
 15.
 75.
 60.

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Electric Circuits
A 230V, 50Hz voltage is applied to a coil having L = 5H and R = 2 Ohm in series with capacitance C. When the voltage across the coil is 400V, find the current in the circuit?

 0.1578 A.
 0.2547 A.
 0.1465 A.
 0.4583 A.

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Electric Circuits
What is the SI unit of electric current ?

 Ohm.
None of these
 Ampere.
 Faraday.

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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.
 1.11.
 0.318.
 0.57.

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Electric Circuits
Which cell has the reversible chemical reaction?

 Silver oxide.
 Lead acid.
 Carbon Zinc.
 Mercury oxide.

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Electric Circuits
A 50 μF capacitor is charged to retain 10 MJ of energy by a constant charging current of 1 A. Determine the voltages across the capacitor?

 20 V.
 30 V.
 50 V.
 60 V.

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