Multiple Choice
To avoid formation of grooves in the commutator of a D.C. machine
A) the brushes of opposite polarity should track each other
B) the brushes of same polarity should track each other
C) brush position has no effect on the commutator grooving
Correct Answer:
Verified
Correct Answer:
Verified
Q2: To achieve sparkless commutation brushes of a
Q3: Open circuited armature coil of a D.C.
Q4: A cumulatively compounded long shunt generator when
Q5: For the parallel operation of two or
Q6: D.C. series generator is used<br>A)to supply traction
Q8: Permeance is the reciprocal of<br>A)flux density<br>B)reluctance<br>C)ampere-turns<br>D)resis tance
Q9: In a D.C. generator the critical resistance
Q10: In D.C. generators the polarity of the
Q11: D.C. generator generally preferred for charging automobile
Q12: The e.m.f. induced in the armature of