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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would
be less than 10%
be 12.5%
be more than 10%
remain unchanged
be less than 10%
be 12.5%
be more than 10%
remain unchanged
Answer
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Related Question
Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes
1/4 of the intial value
twice the initial value
1/2 of the initial value
4 time the initial value
1/4 of the intial value
twice the initial value
1/2 of the initial value
4 time the initial value
Answer
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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?
975 rpm
950 rpm
940 rpm
1000 rpm
975 rpm
950 rpm
940 rpm
1000 rpm
Answer
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Electrical Machines
A short circuit test on a transformer gives
copper loss at full load.
copper loss at half load.
copper loss at any load.
copper loss at over load.
copper loss at full load.
copper loss at half load.
copper loss at any load.
copper loss at over load.
Answer
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Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,
polarities of all transformers must be same.
MVA rating of all transformer inversely proportional to impedance.
voltage ratio of all transformers must be same.
percentage impedance of all transformers must be same.
polarities of all transformers must be same.
MVA rating of all transformer inversely proportional to impedance.
voltage ratio of all transformers must be same.
percentage impedance of all transformers must be same.
Answer
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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?
Increases.
Remain unchanged
None of above.
Decreases.
Increases.
Remain unchanged
None of above.
Decreases.
Answer
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