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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 5.46 KW.
  2.73 KW.
 0.9103 KW.
 1.644 KW.

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Electrical Machines
The application that need frequent starting and stopping is

  paper mills.
  lifts and hoists.
  blowers.
  jaw crushers.

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Electrical Machines
DC series motor is best suited for electric traction as

  It develops high starting torque.
 It runs at very high speed at light load.
 It is cheaper in cost.
 It consume less power.

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/60.
 PN/2.
 PN/120.
 PN/3000.

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 2.2 Ω
 5.7 Ω
 6 Ω
 1.9 Ω

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Semi closed slots.
  Closed slots.
  None of above.
  Open slots.

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MORE MCQ ON Electrical Machines

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