DC Motors Excessive sparking at brushes may be caused due to Worn bearings Misaligment of machine Dirt on the commutator Loose coupling Worn bearings Misaligment of machine Dirt on the commutator Loose coupling ANSWER DOWNLOAD EXAMIANS APP
DC Motors The friction and windage losses in a dc motor depends upon Flux Field and armature resistance Speed Armature current Flux Field and armature resistance Speed Armature current ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc machines the residual magnetism is of the order of 10 to 15 percent 50 to 75 percent 2 to 3 percent 20 to 25 percent 10 to 15 percent 50 to 75 percent 2 to 3 percent 20 to 25 percent ANSWER DOWNLOAD EXAMIANS APP
DC Motors The main disadvantage of the Ward-Leonard control method is High maintenance cost High initial cost All of these Low efficiency at high loads High maintenance cost High initial cost All of these Low efficiency at high loads ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which of the following loss in a D.C. generator varies significantly with the load current? Armature copper loss Windage loss Field copper loss None of these Armature copper loss Windage loss Field copper loss None of these ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a dc motor is to be selected for conveyors, which motor would be preferred? Differentially compound motor Series motor Cummulative compound motor Shunt motor Differentially compound motor Series motor Cummulative compound motor Shunt motor ANSWER DOWNLOAD EXAMIANS APP
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