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Electromagnetic...

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  • Question 1
    4 / -1

    A primary winding of transformer has 500 turns whereas its secondary has 5000 turns. Primary is connected to ac supply of 20V, 50Hz The secondary output of....

  • Question 2
    4 / -1

    A step down transformer is connected to main supply 200 V to operate a 6V, 30 w bulb. The current in primary is.....

  • Question 3
    4 / -1

    Alternating current can not be measured by dc ammeter because,

  • Question 4
    4 / -1

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

  • Question 5
    4 / -1

    An alternating current of rms value 10 A is passed through a 12Ω resistance. The maximum potential difference across the resistor is,

  • Question 6
    4 / -1

    220 V, 50 Hz, ac is applied to a resistor. The instantaneous value of voltage is

  • Question 7
    4 / -1

    General in an alternating current circuit.

  • Question 8
    4 / -1

    In the transmission of a.c. power through transmission lines, when the voltage is shaped up n times, the power loss in transmission,

  • Question 9
    4 / -1

    An alternating voltage is represented as E = 20 sin300t. The average value of voltage over one cycle will be.

  • Question 10
    4 / -1

    An ac source is rated at 220V, 50 Hz. The time taken for voltage to change from its peak value to zero is,

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