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Electric Circuits

Electric Circuits
The life of a lead acid battery is expected to be

 10 to 15 years.
 6 months.
 2 to 5 years.
 1 year.

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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?

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

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Electric Circuits
A parallel plate capacitor with air as dielectric, force between plate is F. If capacitor is now immersed water of dielectric εr, force between plate will be –

 0.
 F εr.
 εr/F.
 F.

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Electric Circuits
The inductive reactance of an electric circuit is 200 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 50 Ohms.
 400 Ohms.
 200 Ohms.
 100 Ohms.

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Electric Circuits
If a resistor and an inductor are connected in series across a voltage source. Which two parameters in that circuit decrease if frequency of voltage source increases?

 VL and Z.
 VL and VR.
 Z and I.
 VR and I.

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Electric Circuits
What is the frequency of domestic power in India?

 50 Hz.
 70 Hz.
 220 Hz.
 60 Hz.

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MORE MCQ ON Electric Circuits

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