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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?
None of above.
Increases.
Decreases.
Remain unchanged
None of above.
Increases.
Decreases.
Remain unchanged
Answer
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Related Question
Electrical Machines
The DC compound motors are generally
None of these.
Cummulative compound.
Differentical compound.
Level Compound.
None of these.
Cummulative compound.
Differentical compound.
Level Compound.
Answer
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Electrical Machines
Total core loss is also called as -------------?
Hysteresis loss
Eddy current loss
Copper loss
Magnetic loss
Hysteresis loss
Eddy current loss
Copper loss
Magnetic loss
Answer
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Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)
remain the same as the original
changes to 1.5 times the original value
changes to 0.5 times the original value
changes to three times the original value
remain the same as the original
changes to 1.5 times the original value
changes to 0.5 times the original value
changes to three times the original value
Answer
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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is
25%
4%
2%
5%
25%
4%
2%
5%
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
50 KVA
83.33 KVA
123.3 KVA
100 KVA
50 KVA
83.33 KVA
123.3 KVA
100 KVA
Answer
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