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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1/S
 1/(1-S)
 1-S

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  frequency of waveform.
  number of turns in coil.
  flux per pole.
All of these

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 220 V.
 240 V.
 150 V.
 280 V.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3600 rpm.
  600 rpm.
  500 rpm.
  3000 rpm.

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

 1.0.
 3 to 5.
  1.5 to 2.
 2 to 3.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at heavy loads only
 low at rated load only
 low at light loads only
 both A and B

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