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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 2
 0 < S < 1
 -2 < S < 2
 -1 < S < 1

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 Fmax.
 3Fmax.
 (1/2)Fmax.
  (3/2)Fmax.

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  separately excited.
  cumulatively compounded.
  shunt connected.
 differentially compounded.

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 3200 W and 5200 W
 1600 W and 5000 W
 3200 W and 2500 W
 1600 W and 1250 W

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its speed will increase
 its efficiency will improve
 its speed will reduce
 its power factor will reduce

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The voltage across the terminals.
 The torque required.
 None of above.
 The speed of motor.

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