Brushes of D.C. machines are made of carbon.
Description : Brushes of DC machine are made up of ?
Answer : Brushes of DC machine are made up of carbon.
Answer : Satisfactory commutation of D.C. machines requires brushes should be of proper grade and size, brushes should smoothly run in the holders, smooth, concentric commutator properly undercut.
Answer : The purpose of retardation test on D.C. shunt machines is to find out stray losses.
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
Answer : In a DC motor, it is important to place the brushes along Magnetic Neutral Axis
Answer : Copper brushes in D.C. machine are used where low voltage and high currents are involved.