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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for
generation of voltage.
electromechanical energy conversion.
development of torque.
commutation.
generation of voltage.
electromechanical energy conversion.
development of torque.
commutation.
Answer
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Related Question
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.
percentage impedance of all transformers must be same.
voltage ratio of all transformers must be same.
polarities of all transformers must be same.
MVA rating of all transformer inversely proportional to impedance.
percentage impedance of all transformers must be same.
voltage ratio of all transformers must be same.
Answer
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Electrical Machines
During no load test, an induction motor draws power
only for the small copper loss.
for core loss and copper loss.
for core loss and windage and friction loss.
for copper loss and windage friction loss.
only for the small copper loss.
for core loss and copper loss.
for core loss and windage and friction loss.
for copper loss and windage friction loss.
Answer
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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be
pulsating and unidirectional
steady and unidirectional
oscillating
None of these
pulsating and unidirectional
steady and unidirectional
oscillating
None of these
Answer
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Electrical Machines
For a single phase capacitor start induction motor which of the following is valid?
None of these.
Direction of rotation cannot be changed.
Rotation can be changed by reversing main winding terminals.
Rotation can be changed by interchanging supply terminals.
None of these.
Direction of rotation cannot be changed.
Rotation can be changed by reversing main winding terminals.
Rotation can be changed by interchanging supply terminals.
Answer
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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?
2000W
1920W
1820W
1450W
2000W
1920W
1820W
1450W
Answer
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