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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Lift.
  Traction.
  Food mixer.
  Domestic pump.

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Compound (cummolative).
 Series.
 none of these.
  Shunt.

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 230 V.
 460 V.
 200 V.
 115 V.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 69 / 3.
  slip X 59 / 3.
 1.
  slip X 50 / 3.

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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:-

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

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 0 V.
 60 V.
  40 V.
 20 V.

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