DC Motors Small dc motors up to 5 HP usually have 2 poles 8 poles 4 poles 6 poles 2 poles 8 poles 4 poles 6 poles ANSWER DOWNLOAD EXAMIANS APP
DC Motors D.C. series motors are used Where load changes frequently Where constant operating speed is needed Where load is constant None of these Where load changes frequently Where constant operating speed is needed Where load is constant None of these ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens Motor will run at very slow speed This will make armature to take heavy current, possibly burning it This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses Nothing will happen to the motor Motor will run at very slow speed This will make armature to take heavy current, possibly burning it This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses Nothing will happen to the motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors Carbon brushes are preferable to copper brushes because _____ They reduce armature reaction They reduce sparking They have lower resistance They have longer life They reduce armature reaction They reduce sparking They have lower resistance They have longer life ANSWER DOWNLOAD EXAMIANS APP
DC Motors Motor starter are essential for Avoiding excessive starting current Preventing fuse blowing Accelerating the motor Starting the motor Avoiding excessive starting current Preventing fuse blowing Accelerating the motor Starting the motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors The armature torque of the D.C. shunt motor is proportional to None of these both (A) and (B) armature current only field flux only None of these both (A) and (B) armature current only field flux only ANSWER DOWNLOAD EXAMIANS APP
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