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Electrical Machines
No load test of 3-phase induction motor gives which of the following?
variable loss
both A and B
constant loss
None of these
variable loss
both A and B
constant loss
None of these
Answer
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Related Question
Electrical Machines
In a DC machine, for the same value of Æ, Z and N; which one of the following statements is correct?
Armature emf is same as long as the flux density in the air gap remains the same.
Armature emf is more with wave winding than with lap winding.
Armature emf is less with wave winding than with lap winding.
Armature emf depends on weather the machine is running as a motor or generator.
Armature emf is same as long as the flux density in the air gap remains the same.
Armature emf is more with wave winding than with lap winding.
Armature emf is less with wave winding than with lap winding.
Armature emf depends on weather the machine is running as a motor or generator.
Answer
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Electrical Machines
For standing a DC motor a starter is required because
it limits the speed of the motor.
it limits the starting current to a safe value.
It starts the motor.
None of these
it limits the speed of the motor.
it limits the starting current to a safe value.
It starts the motor.
None of these
Answer
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Electrical Machines
The armature of DC motor is laminated
to reduce the eddy current loss.
to reduce the hysteresis loss.
to reduce the inductor.
to reduce the mass.
to reduce the eddy current loss.
to reduce the hysteresis loss.
to reduce the inductor.
to reduce the mass.
Answer
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Electrical Machines
Which of the following rotor requires damper winding?
None of these
Cylindrical rotor.
Salient pole rotor.
Both type rotor.
None of these
Cylindrical rotor.
Salient pole rotor.
Both type rotor.
Answer
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Electrical Machines
An induction motor is, in general analogous to
auto transformer.
two winding transformer with secondary open circuited.
two winding transformer with secondary short circuited.
None of these
auto transformer.
two winding transformer with secondary open circuited.
two winding transformer with secondary short circuited.
None of these
Answer
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