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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will
Decrease.d
increase.
none of these.
remains same.
Decrease.d
increase.
none of these.
remains same.
Answer
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Related Question
Electrical Machines
No load test of 3-phase induction motor gives which of the following?
variable loss
both A and B
None of these
constant loss
variable loss
both A and B
None of these
constant loss
Answer
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Electrical Machines
The armature of DC motor is laminated
to reduce the eddy current loss.
to reduce the inductor.
to reduce the mass.
to reduce the hysteresis loss.
to reduce the eddy current loss.
to reduce the inductor.
to reduce the mass.
to reduce the hysteresis loss.
Answer
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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is
83.33 KVA
123.3 KVA
100 KVA
50 KVA
83.33 KVA
123.3 KVA
100 KVA
50 KVA
Answer
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Electrical Machines
The flux involved in the emf equation of a transformer has
rms value.
total value.
average value.
maximum value.
rms value.
total value.
average value.
maximum value.
Answer
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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will
deteriorate and the speed falls.
deteriorate and the speed rises.
improve and the speed rises.
improve and the speed falls.
deteriorate and the speed falls.
deteriorate and the speed rises.
improve and the speed rises.
improve and the speed falls.
Answer
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