The brushes of a dc motor, are shifted by 5‚Äö√Ñ√∂‚àö� – McqOptions

MCQOPTIONS

1.	The brushes of a dc motor, are shifted by 5‚Äö√Ñ√∂‚àö√ë‚Äö√¢¬ß, from the main field axis, then$
A.	demagnetizing or magnetizing effect may occur depending on machine
B.	cross-magnetization will be pronounced
C.	both cross-magnetization as well as magnetization and demagnetization will occur
D.	none of the mentioned
Answer» B. cross-magnetization will be pronounced

Discussion

No Comment Found

Related MCQs

A dc shunt motor is running at 1000 rpm at the rated load torque. If few of the field windings get shot circuited then the __________
A dc shunt motor is running at 1000 rpm at the rated load torque. If we reverse the supply terminals, then the __________
A dc shunt motor is running at 1000 rpm at the rated load torque. If we reverse the filed winding terminals, then the __________
A dc shunt motor is connected to the source through 3-point starter. If the field id kept open and starter handle is moved from off to on position, then __________
Compensating winding has an advantage of __________
Compensating windings are embedded in pole faces and having the same polarity as that of adjoining armature winding.
A 100KW, 250 V, 400 A, a long shunt compound generator has an armature resistance of 0.025 ohms. There are 1000 shunt fields turns per pole and 3 series field turns per pole. The series field is connected in a such a fashion that positive armature current produces direct-axis MMF which adds to that of the shunt field. Compute the gross MMF at the rated terminal current when shunt field current is 4.7A and speed is 1150 rpm.
The brushes of a dc motor, are shifted by 5′, from the main field axis, then __________
Which method needed to limit cross-magnetizing effect?
The flux distortion caused by cross magnetizing armature reaction is more pronounced in a __________