The field coils of D.C. generator are usually made of_____________?
The field coils of D.C. generator are usually made of_____________?
A. mica
B. copper
C. cast iron
D. carbon
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Iron losses in a D.C. machine are independent of variations in______________?
Iron losses in a D.C. machine are independent of variations in______________?A. speed
B. load
C. voltage
D. speed and voltageD.C. generators are connected to the busbars or disconnected from them only under the floating condition________________?
D.C. generators are connected to the busbars or disconnected from them only under the floating condition________________?A. to avoid sudden loading of the primemover
B. to avoid mechanicaljerk to the shaft
C. to avoid burning of switch contacts
D. all aboveThe e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be_______________?
The e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be_______________?A. E/2
B. 2E
C. slightly less than E
D. EIn the case of lap winding resultant pitch is____________?
In the case of lap winding resultant pitch is____________?A. multiplication of front and back pitches
B. division of front pitch by back pitch
C. sum of front and back pitches
D. difference of front and back pitchesWhich of the following generators will be preferred if they are required to be run in parallel?
Which of the following generators will be preferred if they are required to be run in parallel?A. Shunt generators
B. Series generators
C. Compound generators
D. None of the aboveFollowing D.C. generator will be in a position to build up without any residual magnetism in the poles______________?
Following D.C. generator will be in a position to build up without any residual magnetism in the poles______________?A. series generator
B. shunt generator
C. compound generator
D. self-excited generator