DC Motors The back emf in a dc motor ______ None of the listed here Aids the armature current Opposes the applied voltage Aids the applied voltage None of the listed here Aids the armature current Opposes the applied voltage Aids the applied voltage ANSWER DOWNLOAD EXAMIANS APP
DC Motors The torque developed by a dc motor is directly proportional to Armature resistance × applied voltage Flux per pole × armature current None of the listed here Armature resistance × armature current Armature resistance × applied voltage Flux per pole × armature current None of the listed here Armature resistance × armature current ANSWER DOWNLOAD EXAMIANS APP
DC Motors In variable speed motor Same commutating field is needed at low speed than at high speed A weaker commutating field is needed at low speed than at high speed None of these A stronger commutating field is needed at low speed than at high speed Same commutating field is needed at low speed than at high speed A weaker commutating field is needed at low speed than at high speed None of these A stronger commutating field is needed at low speed than at high speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors The speed of a _____ motor is practically constant. Differentially compounded Cumulatively compounded Shunt Series Differentially compounded Cumulatively compounded Shunt Series ANSWER DOWNLOAD EXAMIANS APP
DC Motors Motor starter are essential for Preventing fuse blowing Avoiding excessive starting current Starting the motor Accelerating the motor Preventing fuse blowing Avoiding excessive starting current Starting the motor Accelerating the motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc machines the residual magnetism is of the order of 20 to 25 percent 2 to 3 percent 50 to 75 percent 10 to 15 percent 20 to 25 percent 2 to 3 percent 50 to 75 percent 10 to 15 percent ANSWER DOWNLOAD EXAMIANS APP
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