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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 induction motor
 DC motor
 AC generator
 DC generator

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Electrical Machines
A 3 - Φ slip ring motor has

  double cage rotor.
  wound rotor.
  any of the above.
  short-circuited rotor.

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Electrical Machines
For pure resistive load what is the armature reaction?

 cross magnetization
 demagnetization
All of these
 magnetization

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Electrical Machines
DC machine windings are

None of these
 full pitched
 short pitched
 either of these

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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

 5.7 Ω
 2.2 Ω
 1.9 Ω
 6 Ω

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Power drawn in KW.
 Output power at the shaft.
 Gross power.
 Power drawn in KVA.

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MORE MCQ ON Electrical Machines

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