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Electrical Machines

Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 1000 rpm
 975 rpm
 940 rpm
 950 rpm

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 6 V
 more than 6 V
 less than 6 V
 zero

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 armature current will drop
 armature will oscillate about original speed as the mean speed
 motor will become slow.
 motor will attain dangerously high speed

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

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

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 increase.
 not change.
 decrease.
 None of above.

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Equalizer rings.
 Commutator.
 Eye bolt.
 Dummy coils.

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