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Alternating Cur...

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  • Question 1
    4 / -1

    A series R–L–C circuit, driven with E rms = 120 V at frequency 50 Hz, contains an inductance with X L =100 Ω, a capacitance with XC =110Ω and an unknow resistance R. For what value of R, the power factor is 0.9?

  • Question 2
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    A capacitor .50g is connected to a power source V = 220 sin 50t (V in volt, t in second). The value of rms current (in ampere)

  • Question 3
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    An emf of 15 V is applied in a circuit containing 5 H inductance, 10Ω resistance. The ratio of currents at time t = ∞ and t = 1 is

  • Question 4
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    In the given circuit, the AC source has co = 100 rad /s. Considering the inductor and capacitor to be ideal, the correct choice(s) is (are)

  • Question 5
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  • Question 6
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  • Question 7
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    The instantaneous voltage through a device of impedance 20 Ω is e = 80 sin 100πt. The effective value of the current is

  • Question 8
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  • Question 9
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    A circuit area 0.01 m2 is kept inside a magnetic field which is normal to its plane. The magnetic field changes from 2 T to 1 T in 1 ms. If the resistance of the circuit is 2Ω. The amount of heat evolved is

  • Question 10
    4 / -1

    The time taken by AC of 50 Hz in reaching from zero to the maximum value is

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