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Electrical Machines

Electrical Machines
Maximum power developed depends on

 voltage
 reactance
 both 1and 2
 load angle

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 0o.
 Greater than 90o.
 90o.
 less than 90o.

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Electrical Machines
Armature reaction in dc motor results

  decrease in speed.
  open circuit.
  short circuit.
  increase in speed.

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and field current
 short circuit current and armature current
 no load voltage and armature current
 short circuit current and field current

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Electrical Machines
The armature shaft must be able to withstand

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

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 2 and 3
 1 and 2
 1 and 3
 1, 2 and 3

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MORE MCQ ON Electrical Machines

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