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Electrical Machines

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

 35°C.
 32°C.
  45°C.
 27°C.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Increases.
  Decreases.
 Oscillates around the rated speed.
 Remains unchanged.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 Compound Wound DC Motor
 DC Series Motor
 Separately Excited DC Motor
 DC Shunt Motor

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 1Ω.
  0.23Ω.
 0.5Ω.
 0.25Ω.

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Electrical Machines
A series motor is efficiently suitable for

 constant speed operation.
 none of these.
 low starting torque operation.
  high starting torque operation.

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Electrical Machines
Which of the following statements are correct ?

 A small value of leakage reactance will increase the maximum power output of motor.
None of these
 Both 1 and 2.
 The leakage reactance of the induction motor should be small.

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