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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

  45°C.
 32°C.
 27°C.
 35°C.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 1000 W, 5040 W.
 6000 W, 7000 W.
 100 W, 2000 W.
  3190 W, 5040 W.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 440 A.
 44 A.
  40 A.
 400 A.

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Electrical Machines
Speed of DC motor can be controlled by varying

 resistance of armature culture.
 its flux oer pole.
 all of these.
 applied voltage.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  induction motor torque.
  induction generator torque.
  synchronous motor torque.
  DC motor torque.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  the rotating stator flux and rotor flux.
  magnetizing electric current and back emf.
None of these
  the supply voltage and the back emf.

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