DC Motors Carbon brushes are preferable to copper brushes because _____ They have longer life They reduce armature reaction They have lower resistance They reduce sparking They have longer life They reduce armature reaction They have lower resistance They reduce sparking ANSWER DOWNLOAD EXAMIANS APP
DC Motors During rheostat braking of dc series motor None of the listed here Motor is run at reduced speed Motor is reversed in direction Motor is run as a generator None of the listed here Motor is run at reduced speed Motor is reversed in direction Motor is run as a generator ANSWER DOWNLOAD EXAMIANS APP
DC Motors The direction of rotation of a D.C. series motor can be changed by Either of (A) and (B) above Interchanging supply terminals None of these Interchanging field terminals Either of (A) and (B) above Interchanging supply terminals None of these Interchanging field terminals ANSWER DOWNLOAD EXAMIANS APP
DC Motors The shaft torque in a dc motor is less than total armature torque because of ______ in the motor. Cu losses None of the listed here Field losses Iron and friction losses Cu losses None of the listed here Field losses Iron and friction losses ANSWER DOWNLOAD EXAMIANS APP
DC Motors For the same H.P. rating and full load speed, following motor has poor starting torque Shunt Series Cumulatively compounded Differentially compounded Shunt Series Cumulatively compounded Differentially compounded ANSWER DOWNLOAD EXAMIANS APP
DC Motors If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking Dynamic braking None of these Plugging Regenerative Dynamic braking None of these Plugging Regenerative ANSWER DOWNLOAD EXAMIANS APP
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