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Electromagnetic...

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  • Question 1
    4 / -1

    Which types of losses do not occur in the transformer ?

  • Question 2
    4 / -1

    The turn ratio of a transformer is 1 : 2. An electrolytic DC cell of emf 2 V is connected to its primary. The output voltage across transformer is

  • Question 3
    4 / -1

    Quantity that remains unchanged in a transformer is

  • Question 4
    4 / -1

    Energy required to establish a current of 4 A in a coil of self inductance L= 200 mH is

  • Question 5
    4 / -1

    In 0.1s, the current in a coil increases from 1 A to 1.5 A. If inductance of coil is 60 mH, then induced current in external resistance of 3 Ω will be

  • Question 6
    4 / -1

    Induced emf in the coil depends upon

  • Question 7
    4 / -1

    A solenoid of inductance 2 H carries a current 1 A. What is the magnetic energy stored in a solenoid ?

  • Question 8
    4 / -1

    Magnetic flux of 10 μWb is linked with a coil, when a current of 2mA flows through it. What is the self inductance of the coil ?

  • Question 9
    4 / -1

    What should be the value of self inductance of an inductor that should be connected to 220 V, 50 Hz supply, so that a maximum current of 0.9 A flows through it ?

  • Question 10
    4 / -1

    When the current changes from + 2 A to -2 A in 0.05 s, an emf of 8V is induced in a coil. The coefficient of self induction of the coil is

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