Which of the following brushes can be used for high values of current density ?
A) Metal graphite brushes
B) Hard carbon brushes
C) Electro-graphitic brushes
D) Natural graphite brushes
Correct Answer:
Verified
Q8: D.C. servomotors are used in
A)purely D.C. control
Q9: The stator of a D.C. machine comprises
Q10: The laminations of the armature of a
Q11: is usually used for brush rockers
A)Mild steel
B)Copper
C)Aluminium
D)Cast-iron
Q12: _ brushes are fragile and cause excessive
Q14: _ is the common method of applying
Q15: Which of the following problem arises in
Q16: The weight of copper of both armature
Q17: In a D.C. machine the number of
Q18: In a D.C. machine the current per
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