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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 650 W
 625 W
 700 W

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 45°
 60°
 30°
 10°

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Electrical Machines
DC machine windings are

 full pitched
 either of these
None of these
 short pitched

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Electrical Machines
The armature shaft must be able to withstand

 any unbalanced magnetic pull on the armature core.
 twisting strains due to transmission of torque.
 bending moment due to weight of the armature.
All of these

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and underecited
 heavily loaded and underexcited
 lightly loaded and over excited
 heavily loaded and over excited

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 150 V.
 300 V.
 200 V.
  223.V.

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MORE MCQ ON Electrical Machines

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