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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  2.5 %.
 10 %.
  15 %.
  20 %.

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

 1, 3 and 4.
 2, 3 and 4.
  1, 2 and 3.
 2 and 4.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 less and thin
 large and thin
 large and thick

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  220 V.
  zero.
  about 50 V.
  about 2 V.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 high resistance of carbon brushes.
  reactance voltage.
 presence of commutator.
 armature reaction.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 half.
 one fourth.
 4 times.
 double.

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