Dc Machines Ways Reduce Effects Armature Reaction 1 Online Exam Quiz
Dc Machines Ways Reduce Effects Armature Reaction 1 GK Quiz. Question and Answers related to Dc Machines Ways Reduce Effects Armature Reaction 1. MCQ (Multiple Choice Questions with answers about Dc Machines Ways Reduce Effects Armature Reaction 1
What is the ampere turns per pole for compensating winding in DC machines?
Options
A : (pole arc / pole pitch) * armature ampere turns per pole
B : (pole pitch / pole arc) * armature ampere turns per pole
C : (pole arc / pole pitch) * total ampere conductors per pole
D : Cannot be determined
What is the exact location of compensating winding?
Options
A : Across armature
B : In series with armature
C : Across armature or in series
D : Cannot be determined
Inequality in brush arm currents caused due to different emf induced in different parallel paths may give rise to copper losses. These effects can be avoided by using _________
Options
A : Compensating windings
B : Interpoles
C : Equalizer rings
D : Cannot be determined
The armature reaction in a DC machine causes distortion in the main field flux. Effect of armature reaction can be reduced by_________
Options
A : Increasing the length of air gap
B : Decreasing the length of air gap
C : Increasing the number of poles
D : Decreasing the number of poles
Exact purpose of compensating winding in a DC generator is _________
Options
A : Mainly to reduce the eddy currents by providing local short-circuits
B : To provide path for the circulation of cooling air
C : To neutralise the cross-magnetising effect of the armature reaction
D : Cannot be determined
Function of interpole flux is_________
Options
A : Neutralise the commutating self-induced emf
B : Neutralise the armature reaction flux
C : Neutralise both the armature reaction flux as well as commutating emf induced in the coil
D : Perform none of the above functions
In order to neutralize armature mmf perfectly under the pole shoe, the ampere-conductors of compensating winding must be (pole arc/pole pitch=1) _______
Options
A : Not equal to the total armature ampere conductors under the pole shoe
B : Equal to the total armature ampere conductors under the pole shoe
C : Half of the total armature ampere conductors under the pole shoe
D : Twice of the total armature ampere conductors under the pole shoe
Which of the following method will completely neutralize the armature reaction in a DC machine?
Options
A : Only compensating winding
B : Only interpoles
C : Compensating winding and interpoles
D : Cannot be determined
Where are no equalizer rings connected?
Options
A : Only wave winding
B : Only lap winding
C : Both wave winding and lap winding
D : Cannot be determined
The most likely cause(s) of sparking at the brushes in a DC machine is /are ____________
Options
A : Open coil in the armature
B : Defective interpoles
C : Incorrect brush spring pressure
D : Open coil in armature, defective interpoles and incorrect brush spring pressure
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