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Electrical Machines

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

 32°C.
  45°C.
 27°C.
 35°C.

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 0KVA
 16KVA
 4KVA
 20KVA

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

  Armature current and field current.
 Torque and field current.
 Armature current and torque.
 Power factor and field current.

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  maintaining constant excitation.
  running the motor on leading power factors.
  oscillation cannot be damped.
  providing damper bars in the rotor pole faces.

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 15.6 Nm
 16.55 Nm
 15.28 Nm
 Zero

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 450 rpm.
  470 rpm.
  240 rpm.
 540 rpm.

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