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Electrical Machines

Electrical Machines
Eddy current loss will depends on

 Thickness
All of these
 Flux density
 Frequency

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 provide execessive voltage drop in line.
 draw a starting current many times its rated full load current.
 damage the armature and commutator.
 all of above.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 6 V
 234 V
 474 V
 240 V

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 2*ωm
 ωe = 1/2*ωm
 ωe = ωm
 ωe = 4*ωm

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Electrical Machines
It is advisable to start a DC series motor with some load to

 Limit the flux.
  Limit the speed.
 Avoid sparking.
 Limit the current.

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Compound.
  Separately excited.
 Shunt.
  Series.

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MORE MCQ ON Electrical Machines

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