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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be
equal to number of rotor slots.
an integral multiple of number of rotor slots.
either (B) or (C).
unequal to number of rotor slots and skewed in shape.
equal to number of rotor slots.
an integral multiple of number of rotor slots.
either (B) or (C).
unequal to number of rotor slots and skewed in shape.
Answer
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Related Question
Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do
OC and SC tests
load test
back to back test
None of these
OC and SC tests
load test
back to back test
None of these
Answer
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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.
armature circuit
both A and B
none of above
shunt field
armature circuit
both A and B
none of above
shunt field
Answer
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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is
1, 2, 5
2, 4, 5, 6
2, 3, 6
3, 4, 5
1, 2, 5
2, 4, 5, 6
2, 3, 6
3, 4, 5
Answer
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Electrical Machines
Synchronising power of a synchronous motor varies
All of these
directly as Xs2
inversely as 1/Xs
directly as synchronous reactances Xs
All of these
directly as Xs2
inversely as 1/Xs
directly as synchronous reactances Xs
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:
25 Hz.
100 Hz.
50 Hz.
Zero Hz.
25 Hz.
100 Hz.
50 Hz.
Zero Hz.
Answer
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