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  • Question 1
    4 / -1

    The power is transmitted from a power house on high voltage ac because

  • Question 2
    4 / -1

    The potential difference V and the current i flowing through an instrument in an ac circuit of frequency f are given by V = 5 cos ωt volts and I = 2 sin w t amperes (where ω = 2πf). The power dissipated in the instrument is

  • Question 3
    4 / -1

  • Question 4
    4 / -1

    The resistance of a coil dc is in ohms. In ac, the resistance

  • Question 5
    4 / -1

    In an ac circuit, peak value of voltage is 423 volts. Its effective voltage is

  • Question 6
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    Power dissipated in an LCR series circuit connected to an ac source of emf E is

  • Question 7
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    A generator produces a voltage that is given by V = 240 sin 120 t, where t is in seconds. The frequency and r.m.s. voltage are

  • Question 8
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    If E0 represents the peak value of the voltage in an ac circuit, the r.m.s. value of the voltage will be

  • Question 9
    4 / -1

    The peak value of 220 volts of ac mains is

  • Question 10
    4 / -1

    A sinusoidal ac current flows through a resistor of resistance R. If the peak current is Ip, then the power dissipated is

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