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Electric Circuits

Electric Circuits
A voltage of v = 100 sin (wt + π/3) is applied to pure resistor of 30 Ohm. What is the RMS value of current is

 1.92.
 4.71.
 5.77.
 2.36.

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Electric Circuits
Three resistors of 4 ohm, 6 ohm and 8 ohm are in parallel. In which resistor, power dissipation will be maximum

 8 Ohm.
 equal in all resistors.
 6 Ohm.
 4 Ohm.

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Electric Circuits
For the resonance circuit ω0 = 105, Q = 50, R = 400 Ω the value of C is

 1000 pF.
 500 pF.
 250 pF.
 125 pF.

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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.
 VR and I.
 VL and VR.
 Z and I.

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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

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

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Electric Circuits
What is the real power in AC operation?

 VIcosφ.
 None of these.
 Both option A and B.
 Apperant power × cosφ.

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