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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Star - delta
 Star - star
 Delta - star
 Delta - delta

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

 500 rpm
 250 rpm
 1000 rpm
 2000 rpm

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Proportional to the armature current.
 Proportional to the square of armature current.
 Inversely proportional to the armature current.
 None of above.

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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
 950 rpm
 975 rpm
 940 rpm

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Electrical Machines
In DC shunt motor if load is increased, the speed

 increased slightly.
 remains constant.
 increase proportional.
 reduce slightly.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

 pole stacking
All of these
 pole chamfering
 compensating winding

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MORE MCQ ON Electrical Machines

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