☰ Electrical Machine Design (Electrical Engineering) - MCQs

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Q19.

Yokes with rectangular cross section are used for _______ capacity transformers

  • A. small
  • B. medium
  • C. large
  • D. any of these
    ✍ Discuss    
Q20.

magnetic material used for large transformers is

  • A. cast steel
  • B. hot rolled silicon steel
  • C. cold rolled grain oriented steel
  • D. eithet b or c
    ✍ Discuss    
Q21.

power transformers having ratings above _____ kVA

  • A. 50
  • B. 100
  • C. 250
  • D. 500
    ✍ Discuss    
Q22.

modern starters used in dc shunt motors

  • A. are manual
  • B. use time delay release
  • C. use back EMF sensing relays
  • D. using time delay release or back EMF sensing relays
    ✍ Discuss    
Q23.

the MMF of an interpol is proportional to

  • A. armature current
  • B. field current
  • C. product of armature and field currents
  • D. ratio of armature and field currents
    ✍ Discuss    
Q24.

in a DC generator, emf commutation can be achieved by

  • A. keeping the brushes in the gap
  • B. shifting the brushes in the gap
  • C. shifting the brushes forward
  • D. shifting the brushes backward
    ✍ Discuss    
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