MCQ or Objective Questions on Electric Machines 1

  1. What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

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  2. In alternator, the rotary part is

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  3. A series motor is efficiently suitable for

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  4. A single-winding single-phase motor has

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  5. An ideal synchronous motor has no starting torque because

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  6. Armature reaction in a DC machine

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  7. A differentially compound motor under high-over-load conditions will behave like a / an

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  8. A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

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  9. If peak value of phase mmf is Fmax, then peak value of the rotating field caused by three phase is

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  10. For a fault at the terminal of a synchronous generator, the fault current is maximum for a

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  11. The slip of an induction motor normally does not depend on which of the following?

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  12. Compensating windings is placed in which part of a D.C motor?

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  13. Which type of 1 f induction motor is having the highest power factor at full load ?

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  14. The inertia constant H of a synchronous condenser is

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  15. If the excitation of the synchronous generator fails, it acts as a/an

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  16. Hopkins’s test in dc motor is conducted at ?

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  17. Efficiency of electrical machines should be calculated by measuring

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  18. An unexcited single phase synchronous motor is

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  19. It is difficult to magnetize steel because it has

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  20. An electrodynamic meter can be used to measure

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