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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 3 to 5.
 2 to 3.
 1.0.
  1.5 to 2.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 Increase.
  Decrease.
 Remains same.
 None of these.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start capacitor run motor
 Resistance split phase motor
 Capacitor start motor
All of these

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 no load
 full load
 half load
 any of the above

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 100 V.
 50 V.
 399 V.

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 14 HP.
  13 HP.
 15 HP.
  10 HP.

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