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Electromagnetic Induction Test - 68
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Electromagnetic Induction Test - 68
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  • Question 1/10
    4 / -1
    Choke coil works on the principle of
  • Question 2/10
    4 / -1
    When the speed of a dc motor increases the armature current
    Solutions

  • Question 3/10
    4 / -1
    A six pole generator with fixed field excitation develops an e.m.f. of 100 V, when operating at 1500 rpm. At what speed must it rotate to develop 120 V?
    Solutions

  • Question 4/10
    4 / -1
    The coil of dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. Which of the following conditions is correct
    Solutions

  • Question 5/10
    4 / -1
    Armature current in dc motor will be maximum when
    Solutions

  • Question 6/10
    4 / -1
    The armature of dc motor has 20 Ω resistance. It draws current of 1.5 ampere when run by 220 volts dc supply. The value of back e.m.f. induced in it will be
    Solutions

  • Question 7/10
    4 / -1
    A transformer with efficiency 80% works at 4 kW and 100 V. If the secondary voltage is 200 V, then the primary and secondary currents are respectively.
    Solutions

  • Question 8/10
    4 / -1
    Fan is based on
  • Question 9/10
    4 / -1
    A transformer is employed to
  • Question 10/10
    4 / -1
    What is increased in step-down transformer
    Solutions

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