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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

  All of this.
 Blowers and fans.
 Centrifugal pumps
 Lathes.

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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
Induction motors normally use cast aluminium rotor because aluminium is

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

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Electrical Machines
In DC generator, brushes are always placed along

 load axis.
 geometrical neutral axis.
  magnetic neutral axis.
 armature axis.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.5 p.u
  0.75 p.u
  0.125 p.u
  0.25 p.u

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 15 %.
 25 %.
 50 %.
  10 %.

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MORE MCQ ON Electrical Machines

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