Dc Machines Interview Online Exam Quiz
Dc Machines Interview GK Quiz. Question and Answers related to Dc Machines Interview. MCQ (Multiple Choice Questions with answers about Dc Machines Interview
What is the range of the brush friction coefficients for medium category?
Options
A : 0.40 and above
B : 0.22 to 0.40
C : 0.11 to 0.22
D : 0.08 to 0.11
Spacing between the brushes for a 4-pole machine in terms of commutator segments for 12 conductor segments is _____
Options
A : 48
B : 3
C : 2
D : 6
Spacing between the brushes for a 4-pole machine in terms of commutator segments is equal to 6. What will be the number of armature slots?
Options
A : 48
B : 3
C : 24
D : 6
How many poles to be used in DC machine if brushes are placed 4 commutator segments apart for 16 commutator segments?
Options
A : 8
B : 12
C : 2
D : 4
Reason behind the rapid wear of brushes is __________
Options
A : Abrasion from dust
B : Excessive spring pressure
C : Rough commutator bars
D : Abrasion from dust, excessive spring pressure and rough commutator bars
How to avoid grooves in the commutation of DC machine with the help of brush?
Options
A : Brushes of opposite polarity should track each other
B : Brushes of same polarity should track each other
C : Brush position has no effect on the commutator grooving
D : Brushes should not track each other
What is the requirement of the good commutation?
Options
A : Brushes should be of proper grade, size and material
B : Brushes should smoothly run in the holders
C : Smooth, concentric commutator properly undercut
D : Brushes should be of proper grade, size, material, run smoothly in the holders and concentric commutator properly undercut
The drop in the voltage for which of the following types of brush can be expected to be least?
Options
A : Graphite brushes
B : Carbon brushes
C : Metal graphite brushes
D : Cannot be determined
Specific resistance for a brush is given by _________
Options
A : R = (E * W * T) / (I * L)
B : R = (E * W * I) / (T * L)
C : R = (E * W * I) * (T * L)
D : Doesn’t depend on E, W, T, I, L.
For both lap and wave windings, what is the number of commutator bars equal to?
Options
A : Slots
B : Armature conductors
C : Winding elements
D : Poles
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