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Alternating Current Test - 21
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Alternating Current Test - 21
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  • Question 1/10
    4 / -1
    The self inductance of the motor of an electric fan is 10 H. In order to impart maximum power of 50 Hz, it should be connected to a capacitance of
    Solutions

  • Question 2/10
    4 / -1
    A 50 volt ac is applied across an RC (series) network. The r.m.s. voltage across the resistance is 40 volt, then the potential across the capacitance would be
    Solutions

  • Question 3/10
    4 / -1
    A pure inductance coil of 30 mH is connected to an ac source of 220 V. The r.m.s. current in the coil is
    Solutions

  • Question 4/10
    4 / -1
    In ac series circuit, the resistance, inductive reactance and capacitive reactance are 3Ω,10Ω and 14Ω respectively. The impedance of the circuit is
    Solutions

  • Question 5/10
    4 / -1
    When 100 volts dc is supplied across a solenoid, a current of 1.0 ampere flows in it. When 100 volts ac is applied across the same coil, the current drops to 0.5 ampere. If the frequency of ac source is 50 Hz, then the impedance and inductance of the solenoid are
    Solutions

  • Question 6/10
    4 / -1
    In an LR-circuit, the inductive reactance is equal to the resistance R of the circuit. An e.m.f. E = E0cos (ωt) is applied to the circuit. The power consumed in the circuit is
    Solutions

  • Question 7/10
    4 / -1
    One 10 V, 60 W bulb is to be connected to 100 V line. The required induction coil has self inductance of value (f = 50 Hz)
    Solutions

  • Question 8/10
    4 / -1
    In a series circuit C = 2µF, L =1 mH and R=10Ω. When the current in the circuit is maximum, at that time the ratio of the energies stored in the capacitor and the inductor will be
    Solutions

  • Question 9/10
    4 / -1
    An alternating e.m.f. of angular frequency ω is applied across an inductance. The instantaneous power developed in the circuit has an angular frequency
    Solutions

  • Question 10/10
    4 / -1
    A telephone wire of length 200 km has a capacitance of 0.014µF per km. If it carries an ac of frequency 5 kHz, what should be the value of an inductor required to be connected in series so that the impedance of the circuit is minimum
    Solutions

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