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Electromagnetic...

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  • Question 1
    4 / -1

    The self inductance of a straight conductor is...

  • Question 2
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    A transformer of efficiency 90% draws an input power of 4 kW. An electrical appliance connected across the secondary draws a current of 6 A.The impedance of device is.........

  • Question 3
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    The armature of dc motor has 20 Ω resistance. It draws current of 1.5 A when run by 220 V dc suppy. The value of back induced in it will be

  • Question 4
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    A square loop of side 5 cm being moved right at a constant speed 2 cms–1. The front edge of it enters in magnetic field at t = 0.Fined the induced emf in the loop at t = 1s, 5s, 11s.

  • Question 5
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    In the following circuit the bulb will become suddenly bright if

  • Question 6
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    The self inductance of a coil is 5H, a current of 1A changes to 2A within 5 sec. through the coil. The value of induced emf will be.......

  • Question 7
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    If rotational velocity of a dynamo armature is doubled, then induced emf will become... What is increased in step down transformer ?

  • Question 8
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    The core of a transformer is laminated so that.......

  • Question 9
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    In transformer, core is made of soft iron to reduce.....

  • Question 10
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    An ideal transformer has 1:25 turn ratio. The peak value of the ac is 28 V. The rms ms secondary voltage is nearest to......

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