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Electrical Machines
Use of fractional pitch winding
results in reduced leakage reactance.
make it stiffer.
All of these
results in reduced axial length of the machine.
results in reduced leakage reactance.
make it stiffer.
All of these
results in reduced axial length of the machine.
Answer
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Related Question
Electrical Machines
Why are capacitors used with large AC induction motor?
Improve power level.
Improve power factor.
Improve current level.
Improve voltage level.
Improve power level.
Improve power factor.
Improve current level.
Improve voltage level.
Answer
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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.
960 RPM
940 RPM
920 RPM
970 RPM
960 RPM
940 RPM
920 RPM
970 RPM
Answer
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Electrical Machines
The wound rotor type IM is used for____________ speed operation.
constant.
variable.
minimum.
maximum.
constant.
variable.
minimum.
maximum.
Answer
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Electrical Machines
Scott connections are used for
single phase to three phase transformation.
three phase to two phase transformation.
three phase to single phase transformation.
any of the above.
single phase to three phase transformation.
three phase to two phase transformation.
three phase to single phase transformation.
any of the above.
Answer
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Electrical Machines
Two generators operating in parallel with rating 50MW and 100MW respectively. Both their respective governor settings are identical as 4%, consider same no load frequency. How will the machine share a common load of 100 MW
any of the above
33.33 MW and 66.67 MW respectively
50 MW and 50 MW respectively
66.67 MW and 33.33 MW respectively
any of the above
33.33 MW and 66.67 MW respectively
50 MW and 50 MW respectively
66.67 MW and 33.33 MW respectively
Answer
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