DC Motors The friction and windage losses in a dc motor depends upon Speed Armature current Flux Field and armature resistance Speed Armature current Flux Field and armature resistance ANSWER DOWNLOAD EXAMIANS APP
DC Motors For starting a dc motor a starter is required because None of the listed here It limits the speed of the motor It limits the starting current to a safe value It starts the motor None of the listed here It limits the speed of the motor It limits the starting current to a safe value It starts the motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors Motor starter are essential for Preventing fuse blowing Accelerating the motor Starting the motor Avoiding excessive starting current Preventing fuse blowing Accelerating the motor Starting the motor Avoiding excessive starting current ANSWER DOWNLOAD EXAMIANS APP
DC Motors Excessive motor vibration is caused by Bent shaft Too much brush tension Worn bearings Open armature coil Bent shaft Too much brush tension Worn bearings Open armature coil ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which one of the following is not the function of pole shoes in a D.C. machine? To spread out flux for better uniformity To reduce the reluctance of the magnetic path To support the field coils To reduce eddy current loss To spread out flux for better uniformity To reduce the reluctance of the magnetic path To support the field coils To reduce eddy current loss ANSWER DOWNLOAD EXAMIANS APP
DC Motors As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit A high value resistor is connected across the field winding A resistance is connected parallel to the armature Armature is temporarily open circuited A resistance is connected in series with armature A high value resistor is connected across the field winding A resistance is connected parallel to the armature Armature is temporarily open circuited A resistance is connected in series with armature ANSWER DOWNLOAD EXAMIANS APP
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