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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively
Power factor and field current.
Torque and field current.
Armature current and torque.
Armature current and field current.
Power factor and field current.
Torque and field current.
Armature current and torque.
Armature current and field current.
Answer
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Related Question
Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of
Heavy sparking at brushes.
None of these.
Heavy sparking at the first stud of starting resistance steps.
Both of above.
Heavy sparking at brushes.
None of these.
Heavy sparking at the first stud of starting resistance steps.
Both of above.
Answer
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Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will
coincide with the GNA
shift forward by more than 90°
shift forward by 90°
shift forward by less than 90°
coincide with the GNA
shift forward by more than 90°
shift forward by 90°
shift forward by less than 90°
Answer
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Electrical Machines
Which of the following bearings and their uses are correct
ball bearings → small machines
neither 1 nor 2
roller bearings → large machines
both A and B
ball bearings → small machines
neither 1 nor 2
roller bearings → large machines
both A and B
Answer
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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?
3 Hz.
2 Hz.
50 Hz.
10 Hz.
3 Hz.
2 Hz.
50 Hz.
10 Hz.
Answer
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Electrical Machines
In electric locomotives which of the following motor are used ?
DC compound motor.
DC series motor.
DC Shunt motor.
Synchronous motor.
DC compound motor.
DC series motor.
DC Shunt motor.
Synchronous motor.
Answer
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