DC Motors What will happen if the back emf of a dc motor vanishes suddenly? The motor will continue to run The armature may burn The motor will run noisy The motor will stop The motor will continue to run The armature may burn The motor will run noisy The motor will stop ANSWER DOWNLOAD EXAMIANS APP
DC Motors Excessive motor vibration is caused by Too much brush tension Open armature coil Worn bearings Bent shaft Too much brush tension Open armature coil Worn bearings Bent shaft ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc machines the residual magnetism is of the order of 20 to 25 percent 2 to 3 percent 10 to 15 percent 50 to 75 percent 20 to 25 percent 2 to 3 percent 10 to 15 percent 50 to 75 percent ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors? Low cost Wide speed range High starting torque Stability Low cost Wide speed range High starting torque Stability ANSWER DOWNLOAD EXAMIANS APP
DC Motors Usually wide and sensitive speed control is desired in case of Centrifugal pumps Colliery winders Elevators Steel rolling mills Centrifugal pumps Colliery winders Elevators Steel rolling mills ANSWER DOWNLOAD EXAMIANS APP
DC Motors The plugging gives the Zero torque braking None of the listed here Highest torque braking Smallest torque braking Zero torque braking None of the listed here Highest torque braking Smallest torque braking ANSWER DOWNLOAD EXAMIANS APP
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