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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 500 rpm
 2000 rpm
 1000 rpm
 250 rpm

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Electrical Machines
In an ideal DC generator the regulation is

 high.
 zero.
 low.
 positive.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

  65.8 Nm.
 27.73 Nm .
 38.5 Nm.
 74 Nm.

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

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

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Electrical Machines
In a DC compound motor the field regulator is provided to

 control the armature flux.
 demagnetize the field partially.
 control the field flux.
 limit the armature current.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 5 / 6.
 6 / 7.
 2 / 3.
  4 / 5.

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