A. rivets
B. counter sunk screws
C. brazing
D. welding
A. zero
B. small
C. the same as rated voltage
D. high
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
D. None
A. to increase the series flux
B. to increase the generated e.m.f.
C. to reduce the combined effect of ar-mature reaction of both the machines
D. so that the two identical machines will pass approximately equal cur¬rents to the load
A. lie under south pole
B. lie under north pole
C. lie under interpolar region
D. are farthest from the poles
A. is the same as that of the main pole ahead
B. is the same as that of the immediately preceding pole
C. is opposite to that of the main pole ahead
D. is neutral as these poles do not play part in generating e.m.f.
A. only if the load current is zero
B. only if the load current is not zero
C. irrespective of the value of load current
D. none of the above