The material used for commutator brushes is mostly

Related MCQs

• Due to which of the following reasons, copper brushes in D.C. machine are used?
• The sole purpose of a commutator in a dc generator is to
• The commutator of D.C. geenrator acts as ___
• Each commutator segment is connected to armature conductor by means of ___
• In DC machine, brushes are always placed along
• In a DC motor the brushes shifted from the mechanical nuetral plane in a direction opposite to the rotation to _____.
• Excessive sparking at the brushes may be caused due to _____.
• A 220V DC series motor is taking a current of 40A. Resistance of armature is 0.5Ω and series field is 0.25Ω. What is the voltage at the brushes?
• A thick wire is used in dc series motor field winding than that in dc shunt motor:
• In DC machine, lap winding is used in