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Alternating Current Test - 59
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Alternating Current Test - 59
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  • Question 1/10
    4 / -1

    Solutions

  • Question 2/10
    4 / -1
    The self inductance of a choke coil is 10 mH. When it is connected with a 10 V dc source, then the loss of power is 20 watt. When it is connected with 10 volt ac source loss of power is 10 watt. The frequency of ac source will be
    Solutions

  • Question 3/10
    4 / -1
    In an LCR circuit R = 100 ohm. when capacitance C is removed, the current lags behind the voltage by π/3. When inductance L is removed, the current leads the voltage by π/3. The impedance of the circuit is
    Solutions

  • Question 4/10
    4 / -1
    A group of electric lamps having a total power rating of 1000 watt is supplied by an ac voltage E = 200 sin(310t + 60° ). Then the r.m.s. value o the circuit current is
    Solutions

  • Question 5/10
    4 / -1
    Following figure shows an ac generator connected to a \"block box\" through a pair of terminals. The box contains possible R, L, C or their combination, whose elements and arrangements are not known to us. Measurements outside the box reveals that
    e = 75 sin (sin ωt) volts,
    i = 1.5 sin (ωt + 45° )
    amp. The wrong statement is

  • Question 6/10
    4 / -1
    A resistor R, an inductor L and a capacitor C are connected in series to an oscillator of frequency n. If the resonant frequency is nr, then the current lags behind voltage, when
    Solutions

  • Question 7/10
    4 / -1
    The instantaneous values of current and voltage in an ac circuit are i = 100 sin 314 t amp and e = 200 sin (314 t + π/3) V respectively. If the resistance is 1 Ω, then the reactance of the circuit will be
    Solutions

  • Question 8/10
    4 / -1
    What will be the self inductance of a coil, to be connected in a series with a resistance of π√3 Ω, such that the phase difference between the e.m.f. and the current at 50 Hz frequency is 30°
    Solutions

  • Question 9/10
    4 / -1
    The phase difference between the voltage and the current in an ac circuit is π/4. If the frequency is 50 Hz then this phase difference will be equivalent to a time of
    Solutions

  • Question 10/10
    4 / -1

    Solutions

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