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Electrical Machines

Electrical Machines
On what factors the speed of dc motor depends?

 Applied voltage.
 All of these.
 Field flux.
 Armature current Ia.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 59 / 3.
 1.
  slip X 50 / 3.
  slip X 69 / 3.

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 run at normal speed.
 run at lower speed.
 not run.

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 leading power factor.
None of these
 unity power factor.
 lagging power factor.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

  2 KW.
 10 KW.
 8 KW.
 0.

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce hysteresis loss.
  to reduce eddy current loss.
  to provide better flux linkage.
  to reduce mechanical losses.

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