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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to
component of armature mmf along field axis
non-sinusoidal nature of armature mmf
uneven air-gap length
magnetic saturation in half of the field pole
component of armature mmf along field axis
non-sinusoidal nature of armature mmf
uneven air-gap length
magnetic saturation in half of the field pole
Answer
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Related Question
Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.
218.5 volt.
None of these.
220.4 volt.
120 volt.
218.5 volt.
None of these.
220.4 volt.
120 volt.
Answer
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Electrical Machines
Which of the following motors are suitable for computer printer drive ?
Hysteresis motor.
Reluctance motor.
Shaded pole motor.
Stepper motor.
Hysteresis motor.
Reluctance motor.
Shaded pole motor.
Stepper motor.
Answer
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Electrical Machines
Cross magnetization effects which of the following?
reduction in main field flux
both 2 and 3
commutation
reduces the terminal voltage
reduction in main field flux
both 2 and 3
commutation
reduces the terminal voltage
Answer
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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.
any of above method.
Ward Leonard control.
rheostatic control.
none of above.
any of above method.
Ward Leonard control.
rheostatic control.
none of above.
Answer
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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is
near to 1.
Greater than 1.
0.25.
0.5.
near to 1.
Greater than 1.
0.25.
0.5.
Answer
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