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Electrical Machines
which of the following losses are negligible in blocked rotor test?
iron loss
both A and B
mechanical loss
copper loss
iron loss
both A and B
mechanical loss
copper loss
Answer
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Related Question
Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor
Decrease in speed but armature current remains the same.
Increase in speed demanding more armature current.
Increase in speed but armature currnet remains the same.
Decrease in speed demanding less armature current.
Decrease in speed but armature current remains the same.
Increase in speed demanding more armature current.
Increase in speed but armature currnet remains the same.
Decrease in speed demanding less armature current.
Answer
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Electrical Machines
In a DC compound motor the field regulator is provided to
control the armature flux.
control the field flux.
demagnetize the field partially.
limit the armature current.
control the armature flux.
control the field flux.
demagnetize the field partially.
limit the armature current.
Answer
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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.
kept constant to certain value.
increased.
remains unchanged.
decreased.
kept constant to certain value.
increased.
remains unchanged.
decreased.
Answer
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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?
1450.
1500.
1440.
1435.
1450.
1500.
1440.
1435.
Answer
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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then
I1 = KI2 + Iw.
I1 = KI2 + Iw + Iμ.ok
I1 = KI2.
I1 = KI2 + Iμ.
I1 = KI2 + Iw.
I1 = KI2 + Iw + Iμ.ok
I1 = KI2.
I1 = KI2 + Iμ.
Answer
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