Dc Machines Armature Reaction 1 Online Exam Quiz
Dc Machines Armature Reaction 1 GK Quiz. Question and Answers related to Dc Machines Armature Reaction 1. MCQ (Multiple Choice Questions with answers about Dc Machines Armature Reaction 1
Peak flux density in terms of total flux density is given by _________
Options
A : ATa (peak) = ATa (total) /P
B : ATa (peak) = ATa (total) *P
C : ATa (peak) = ATa (total) /P*P
D : ATa (peak) = ATa (total) *P2
In a DC machine, the direct axis is __________
Options
A : Axes of main poles
B : Axes perpendicular to axes of main poles
C : Not determined from the poles position
D : Can be drawn anywhere
Armature reaction of an unsaturated DC machine is (in terms of magnetization) ________
Options
A : Cross-magnetizing
B : Demagnetizing
C : Magnetizing
D : Cannot be determined
What will happen at poles due to armature reaction in DC generator?
Options
A : Demagnetisation of leading pole tip and magnetisation of trailing pole tip
B : Demagnetisation of trailing pole tip and magnetisation of leading pole tip
C : Demagnetising at the centre of all poles
D : Magnetising at the centre of all poles
Increase in flux density at one end of the pole is less than the decrease at the other end. This is called as ____________
Options
A : Demagnetizing mmf
B : Cross-magnetizing mmf
C : Anti-magnetizing mmf
D : Magnetizing mmf
Armature reaction at 900 to the main field is called as ____________
Options
A : Demagnetizing mmf
B : Cross-magnetizing mmf
C : Anti-magnetizing mmf
D : Magnetizing mmf
Due to the effect of armature reaction in DC machine, the flux per pole and generated voltage ______ and ________ respectively.
Options
A : Increases, decreases
B : Decreases, decreases
C : Decreases, increases
D : Increases, increases
What is the reason behind short circuit in armature?
Options
A : Insulation failure between two commutator bars
B : Insulation failure between two turns of a coil
C : Two or more turns of the same coil getting grounded
D : Insulation failure between two commutator bars, two turns of a coil or the same coil getting grounded
In DC generator, how armature reaction is produced?
Options
A : Its field current
B : Armature conductors
C : Field pole winding
D : Load current in armature
In a DC generator, the effect of armature reaction on the main pole flux is to _________
Options
A : Reduce it
B : Distort it
C : Reverse it
D : Reduce and distort it
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