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Electromagnetic...

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  • Question 1
    4 / -1

    The instantaneous voltage through a device of impedance 20Ω is ε = 80 sin100πt . The effective value of the current is,

  • Question 2
    4 / -1

    A choke coil has.

  • Question 3
    4 / -1

    A 20 volts ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is,

  • Question 4
    4 / -1

    The impedance of a circuit consists of 3Ω resistance and 4Ω reactance. The power factor of the circuit is.

  • Question 5
    4 / -1

    A coil of inductance L has an inductive reactance of XL in 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 in the coil is.

  • Question 6
    4 / -1

    Two identical incandescent light bulbs are connected as shown in figure. when the circuit is an AC voltage source of frequency f, which of the following observations will be correct.

  • Question 7
    4 / -1

    For high frequency, a capacitor offers

  • Question 8
    4 / -1

    The coil of a choke in a circuit

  • Question 9
    4 / -1

    In a LCR circuit capacitance is changed from C to 2C. For the resonant fequency to remain unchanged, the inductance should be change from L to

  • Question 10
    4 / -1

    In an LCR series ac circuit the voltage across each of the components L, C and R is 50 V. The voltage across the LC combination will be

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