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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to
approx to one.
very low
greater than one.
less than one.
approx to one.
very low
greater than one.
less than one.
Answer
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Related Question
Electrical Machines
Rotating part of DC motor is known as
Pole.
Armature.
Carbone brush.
Starter.
Pole.
Armature.
Carbone brush.
Starter.
Answer
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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is
0.08
-0.08
1.92
-1.92
0.08
-0.08
1.92
-1.92
Answer
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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be
proportionate to MVA rating of transformers.
same.
such that actual impedance of all transformers would be same.
inversely proportional to MVA rating of transformers.
proportionate to MVA rating of transformers.
same.
such that actual impedance of all transformers would be same.
inversely proportional to MVA rating of transformers.
Answer
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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with
constant supply voltage V, starting torque Tst decreases
None of these
constant V, Tst increases
either of these
constant supply voltage V, starting torque Tst decreases
None of these
constant V, Tst increases
either of these
Answer
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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:
100 Hz.
Zero Hz.
25 Hz.
50 Hz.
100 Hz.
Zero Hz.
25 Hz.
50 Hz.
Answer
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