DC Motors In a dc motor, the brushes are shifted from the mechanical neutral plane in a direction opposite to the rotation to _____ Increase speed Reduce sparking Produce flat characteristics Decrease speed Increase speed Reduce sparking Produce flat characteristics Decrease speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors The friction and windage losses in a dc motor depends upon Flux Speed Armature current Field and armature resistance Flux Speed Armature current Field and armature resistance ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which of the following motors is most suitable for signalling devices and many kinds of timers ? Induction motor C. shunt motor C. series motor Reluctance motor Induction motor C. shunt motor C. series motor Reluctance motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors Armature reaction in dc motor is increased By interpoles When the armature current decreases When the field current increases When the armature current increases By interpoles When the armature current decreases When the field current increases When the armature current increases ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which method of braking is generally used in elevators? Regenerative braking None of these Plugging Rheostat braking Regenerative braking None of these Plugging Rheostat braking ANSWER DOWNLOAD EXAMIANS APP
DC Motors The main disadvantage of the Ward-Leonard control method is Low efficiency at high loads High maintenance cost High initial cost All of these Low efficiency at high loads High maintenance cost High initial cost All of these ANSWER DOWNLOAD EXAMIANS APP
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