Multiple Choice
Open circuited armature coil of a D.C. machine is
A) identified by the scarring of the commutator segment to which open circuited coil is connected
B) indicated by a spark completely around the commutator
C) both (a) and (b)
D) none of the above
Correct Answer:
Verified
Correct Answer:
Verified
Q1: Flashing the field of D.C. generator means<br>A)neutralising
Q2: To achieve sparkless commutation brushes of a
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
Q7: To avoid formation of grooves in the
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