A. Dummy coils
B. Commutator
C. Eye bolt
D. Equilizer rings
A. only if the resistance of the field circuit is less than critical value
B. only if the resistance of the field circuit is greater than critical value
C. irrespective of the value of the resistance in the field circuit
D. none
A. lap winding
B. wave moving
C. duplex winding
D. any of the above
A. flux density
B. reluctance
C. ampere-turns
D. resistance
A. mica
B. copper
C. cast iron
D. carbon
A. r.p.m. is more than 300
B. r.p.m. is less than 300
C. number of poles is 4
D. number of poles is 2
A. their rising voltage characteristics
B. unequal number of turns in their series field windings
C. unequal speed regulation of their primemovers
D. unequal series field resistances