Recent questions tagged brushes

Description : In a DC motor, it is important to place the brushes along ______ A) Magnetic Neutral Axis B) Normal Geometric Axis C) Nominal Geometric Axis D) None of these

Last Answer : In a DC motor, it is important to place the brushes along Magnetic Neutral Axis

Last Answer : The rapid wear of brushes takes place due to abrasion from dust, excessive spring pressure, rough commutator bars, high mica insulation between com-mutation bars.

Last Answer : Armature coil is short circuited by brushes when it lies along neutral axis.

Last Answer : The number of brushes in a commutator depends on amount of current to be collected.

Last Answer : The material for commutator brushes is generally carbon.

Last Answer : Brushes of D.C. machines are made of carbon.

Last Answer : Copper brushes in D.C. machine are used where low voltage and high currents are involved.

Last Answer : In lap winding, the number of brushes is always same as the number of poles.

Description : Brushes of DC machine are made up of ?

Last Answer : Brushes of DC machine are made up of carbon.

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