Dc Machines Brushes Commutator Assembly Online Exam Quiz
Dc Machines Brushes Commutator Assembly GK Quiz. Question and Answers related to Dc Machines Brushes Commutator Assembly. MCQ (Multiple Choice Questions with answers about Dc Machines Brushes Commutator Assembly
Which of the following method is used to connect commutator segments to armature conductors?
Options
A : Brazing
B : Normal wires
C : Insulation pads
D : Copper lugs
In DC generators, current is fed up to the external circuit from armature through _______
Options
A : Commutator
B : Direct wire
C : Slip rings
D : Cannot be determined
What are the number of the brushes in the lap winding?
Options
A : Double the number of poles
B : Same as the number of poles
C : Half the number of poles
D : Two
In a DC machine, rectification provided with commutator is ___________
Options
A : Half wave rectification
B : Full wave rectification
C : Semi controlled rectification
D : Uncontrolled rectification
Which conductors are in point of contact with brushes?
Options
A : Lie under south pole
B : Lie under north pole
C : Lie in inter polar region
D : Are farthest from the poles
In case of DC machine winding, number of commutator segments is equal to ______
Options
A : Number of armature coils
B : Number of armature coil sides
C : Number of armature conductors
D : Number of armature turns
The armature in DC machines is always placed on rotor because _______
Options
A : Otherwise commutation will not be possible
B : Otherwise there will not be any induced emf
C : Otherwise current will not flow
D : Can be placed anywhere
What are the number of the brushes in the wave winding?
Options
A : Same or more than the number of poles
B : Same or less than the number of poles
C : Exactly half the number of poles
D : Depends on other parameters
In D.C. generators, rapid brush ware causes due to _________
Options
A : Severe sparking
B : Rough commutator surface
C : Imperfect contact
D : Severe sparking, rough commutator surface or imperfect contact
How total number of brushes in a commutator are determined in a given DC machine?
Options
A : Speed of armature
B : Type of winding
C : Voltage
D : Amount of current to be collected
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