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Electric Circuits

Electric Circuits
The electrical resistance of human body is around

  1000 ohms.
  250 ohms.
  5 ohms.
  25 ohms.

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Electric Circuits
A capacitor having a capacitance of 40 μF is connected across 250 V DC source. The charging current will be least

 when capacitor is almost 25% charged.
 when capacitor is fully charged.
 when capacitor is half charged.
 initially.

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Electric Circuits
If c1 = 8 μF, c2 = 4 μF, c3 = 7 μF c1, c2 are in series with c3 in parallel; effective capacitance will be

 6 μF.
 9.67 μF.
 3 μF.
 2.21 μF.

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Electric Circuits
A conductor of length l meters moves at right angles to a uniform magnetic field of flux density B = 1.5 T. if the velocity of revolution of the conductor is 50 ms-1 then induced e.m.f. in the conductor is

 100 V.
 125 V.
 0 V.
 75 V.

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

 Zero
 Unity
 Lagging
 Leading

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Electric Circuits
A capacitor of 50 microfarad is connected in series with a resistance of 120 Ω. If above circuit is connected across 240 V, 50 Hz 1 - φ supply. Find the capacitive reactance?

 0.015 Ω.
 63.7 Ω.
 1.765 Ω.
 135.86 Ω.

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