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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 50 Ω
 0.1 Ω
 10 Ω
 100 Ω

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 0 V
 4 V
 1 V

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Electrical Machines
Skewing of cage rotors offers the following advantages

  locking tendency is reduced.
  less noise.
  uniform torque.
  all of below.

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 1, 4
 2, 4
 1, 3
 2, 3

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Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Traction.
  Lift.
  Domestic pump.

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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.
 10 volts.
 40 volts.

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