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Alternating Current Test - 49
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Alternating Current Test - 49
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  • Question 1/10
    4 / -1
    The power factor of a good choke coil is
    Solutions

  • Question 2/10
    4 / -1
    An alternating current source of frequency 100 Hz is joined to a combination of a resistance, a capacitance and a coil in series. The potential difference across the coil, the resistance and the capacitor is 46, 8 and 40 volt respectively. The electromotive force of alternating current source in volt is
    Solutions

  • Question 3/10
    4 / -1
    A 10 ohm resistance, 5 mH coil and 10 μF capacitor are joined in series. When a suitable frequency alternating current source is joined to this combination, the circuit resonates. If the resistance is halved, the resonance frequency
    Solutions

  • Question 4/10
    4 / -1
    In a series circuit R = 300 Ω, L = 0.9 H, C = 2.0µF and ω = 1000 rad/sec. The impedance of the circuit is
    Solutions

  • Question 5/10
    4 / -1

    Solutions

  • Question 6/10
    4 / -1
    In a series LCR circuit, operated with an ac of angularfrequency ω, the total impedance is
  • Question 7/10
    4 / -1

    Solutions

  • Question 8/10
    4 / -1
    An e.m.f. E = 4 cos (1000 t) volt is applied to an LR–circuit of inductance 3 mH and resistance 4 ohms. The amplitude of current in the circuit is
    Solutions

  • Question 9/10
    4 / -1
    In an ac circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°, the value of inductive reactance will be
    Solutions

  • Question 10/10
    4 / -1
    A coil of inductance L has an inductive reactance of XLin an ac circuit in which the effective current is I. The coil is made from a super–conducting material and has no resistance. The rate at which power is dissipated inthe coil is
    Solutions

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