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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

All of these
  convection.
 radiation.
 conduction.

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the number of turns in field coil.
 increase the source frequency.
 increase the number of turns in armature coil.
  increase the speed of shaft rotation.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 trapezoidal.
 sinusoidal.
 rectangular.
  triangular.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

  Capacitor run type.
 Split phase type.
 Capacitor start.
 Shaded pole type.

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Electrical Machines
Which of the following motor has more stability

 salient pole motor
 cylindrical motor
None of these
 both motors has same stability

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 N1 : N2.
 none.
 N12 : N22.
 1 : 1.

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