Permeance is the reciprocal of______________?
Permeance is the reciprocal of______________?
A. flux density
B. reluctance
C. ampere-turns
D. resistance
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The critical resistance of the D.C. generator is the resistance of_____________?
The critical resistance of the D.C. generator is the resistance of_____________?A. field
B. brushes
C. armature
D. loadIn a D.C. machine stray loss is the sum of_____________?
In a D.C. machine stray loss is the sum of_____________?A. total copper loss and mechanical loss
B. armature copper loss and iron loss
C. shunt field copper loss and mechanical loss
D. iron loss and mechanical lossShunt generators are most suited for stable parallel operation because of their______________?
Shunt generators are most suited for stable parallel operation because of their______________?A. rising voltage characteristics
B. identical voltage characteristics
C. droog voltage characteristics
D. linear voltage characteristicsA series generator can self-excite:______________?
A series generator can self-excite:______________?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 aboveThe insulating material used between the commutator segments is normally_____________?
The insulating material used between the commutator segments is normally_____________?A. graphite
B. paper
C. mica
D. insulating varnishIn D.C. generators, the cause of rapid brush wear may be___________?
In D.C. generators, the cause of rapid brush wear may be___________?A. severe sparking
B. rough commutator surface
C. imperfect contact
D. any of the above