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Electrical Machines

Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 30°
 60°
 20°
 18°

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  vibrations.
  heating of rotor.
All of these
  double frequency currents in the rotor.

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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

 40 V
 20 V
 50 V
 zero

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 comulatively compounded motor
 permanent magnet motor
 series motor
 differentially compounded motor

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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?

 150 V.
 210 V
 240 V.
 230 V.

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Electrical Machines
In a transformer which of the following losses are zero?

 Rotational loss
 Copper loss
 Iron loss
All of these

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MORE MCQ ON Electrical Machines

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