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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -1.92
 0.08
 -0.08
 1.92

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  lighter in weight.
  of low resistivity.
  cheaper in cost.
  easy to cast owing to its low melting point and is easily available.

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Electrical Machines
No load saturation characteristics are plotted between

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

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  4000 rpm.
  1500 rpm.
  3600 rpm.
  3000 rpm.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = P/2*ωm
 ωe = ωm
 ωe = P*ωm
 ωe = 2/P*ωm

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 decreased.
 kept constant to certain value.
  increased.
 remains same.

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