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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  cast iron.
  aluminium.
  stainless steel.
  mild steel.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 20 V
 zero
 50 V
 40 V

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The speed of motor.
 The torque required.
 The voltage across the terminals.
 None of above.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

All of these
 compensating winding
 pole stacking
 pole chamfering

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Electrical Machines
Demagnetization effects which of the following?

 reduces the terminal voltage
 both B and C
 reduction in main field flux
 commutation

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 30 volts.
 20 volts.
 40 volts.
 10 volts.

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