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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Cast iron.
 Mild steel.
 Silicon steel.
  Fibre.

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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

 6 Ω
 5.7 Ω
 1.9 Ω
 2.2 Ω

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 266.20 N-m.
 234.76 N-m.
 133.22 N-m
 can not be determined.

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Electrical Machines
Poles of DC machine are often laminated to

 reduce armature reaction.
 reduce iron weight.
 dissipate more heat.
 reduce pulsation loss.

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  shunt motor.
  asynchronous motor.
  transformer.
  repulsion motor.

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Electrical Machines
Magnetic field of a DC generator is produced by what?

  Electromagnets.
 Both B and C.
 None of the options.
 Permanent magnets.

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MORE MCQ ON Electrical Machines

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