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Electromagnetic...

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  • Question 1
    4 / -1

    The number of turns in the coil of an ac generator is 5000 and the area of the coil is 0.25 m2. The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2 W/m2. The peak value of the e.m.f. generated is nearly

  • Question 2
    4 / -1

    In a dc motor, induced e.m.f. will be maximum

  • Question 3
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    Work of electric motor is

  • Question 4
    4 / -1

    In an induction coil with resistance, the induced e.m.f. will be maximum when

  • Question 5
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    The induction coil works on the principle of

  • Question 6
    4 / -1

    An electric motor operates on a 50 volt supply and a current of 12A. If the efficiency of the motor is 30%, what is the resistance of the winding of the motor

  • Question 7
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    A motor having an armature of resistance 2 Ω is designed to operate at 220 V mains. At full speed, it develops a back e.m.f. of 210 V. When the motor is running at full speed, the current in the armature is

  • Question 8
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    A transformer is employed to

  • Question 9
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    What is increased in step-down transformer?

  • Question 10
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    In a transformer 220 ac voltage is increased to 2200 volts. If the number of turns in the secondary are 2000, then the number of turns in the primary will be

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