Electrical Machines Mcqs Online Exam Quiz
Electrical Machines Mcqs GK Quiz. Question and Answers related to Electrical Machines Mcqs. MCQ (Multiple Choice Questions with answers about Electrical Machines Mcqs
A 400-V, 1000-A, lap wound dc machine has 10 poles, 860 armature conductors. The number of conductors in the pole face to give full compensation if pole face covers 70% of pole span is?
Options
A : 3010
B : 4300
C : 2400
D : 2800
The brushes are placed __________
Options
A : along geometrical neutral axis
B : perpendicular to geometrical neutral axis
C : along magnetic neutral axis
D : perpendicular to magnetic neutral axis
If the magnetic circuit of the dc machine is in the saturation region, the armature reaction __________
Options
A : does not affect flux/pole
B : increases the flux/pole
C : decreases flux/pole
D : affects the flux/pole only when armature current is small
The principle contributors to magneto motive force is/are __________
Options
A : field current and armature current
B : field excitation
C : electromagnetic torque
D : all of the mentioned
The brushes should be shifted in _______ direction in generator for the satisfactory operation of commutation.
Options
A : forward
B : reverse to rotation
C : all of the mentioned
D : none of the mentioned
The coil under going commutation lies along _____ while the coil getting short circuited lies along ____ for a practical dc machine.
Options
A : gna, mna
B : mna, gna
C : gna, gna
D : mna, mna
The armature reaction is produced mainly by __________
Options
A : load current in armature
B : load current in field
C : all of the mentioned
D : none of the mentioned
The compensating winding in dc generator is provided to __________
Options
A : neutralize cross-magnetizing flux
B : neutralize demagnetizing flux
C : neutralize armature mmf
D : maintain magnetizing mmf
The absence of compensating winding lead to __________
Options
A : statically induced emf in armature
B : fluctuations in supply
C : reduction in the flux
D : any of the mentioned
Each of the following is valid for interpoles except __________
Options
A : they are connected in parallel with the armature so that they carry part of armature current
B : they are small yoke fixed poles spaced in between main poles
C : their polarity, in case of generator is same as that of main poles ahead
D : they automatically neutralize not only reactance voltage but cross-magnetization also
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