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Electrical Machines
The power developed by salient pole synchronous machine is/are
None of these
power due to saliency or reluctance only
excitation power only
both 1 and 2
None of these
power due to saliency or reluctance only
excitation power only
both 1 and 2
Answer
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Related Question
Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will
increase.
remain unaltered.
decrease.
become execessively high.
increase.
remain unaltered.
decrease.
become execessively high.
Answer
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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is
interpole and compensating windings together
field winding
interpole winding
armature winding
interpole and compensating windings together
field winding
interpole winding
armature winding
Answer
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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with
either of these
constant supply voltage V, starting torque Tst decreases
constant V, Tst increases
None of these
either of these
constant supply voltage V, starting torque Tst decreases
constant V, Tst increases
None of these
Answer
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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is
600
60
660
40
600
60
660
40
Answer
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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to
240 A.
127 A.
173 A.
190 A.
240 A.
127 A.
173 A.
190 A.
Answer
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