DC Motors Carbon brushes are preferable to copper brushes because _____ They have longer life They reduce sparking They reduce armature reaction They have lower resistance They have longer life They reduce sparking They reduce armature reaction They have lower resistance ANSWER DOWNLOAD EXAMIANS APP
DC Motors When the armature of a D.C. motor rotates, e.m.f. induced is Back e.m.f. Mutually induced e.m.f. Self-induced e.m.f. None of these Back e.m.f. Mutually induced e.m.f. Self-induced e.m.f. None of these ANSWER DOWNLOAD EXAMIANS APP
DC Motors For a D.C. shunt motor if the excitation is changed Torque will change but power will remain constant Torque will remain constant Torque, power and speed, all will change Torque and power both will change Torque will change but power will remain constant Torque will remain constant Torque, power and speed, all will change Torque and power both will change ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which motor should be used for centrifugal pumps? Series motor Either series or shunt Shunt motor None of the listed here Series motor Either series or shunt Shunt motor None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors Usually wide and sensitive speed control is desired in case of Centrifugal pumps Elevators Steel rolling mills Colliery winders Centrifugal pumps Elevators Steel rolling mills Colliery winders ANSWER DOWNLOAD EXAMIANS APP
DC Motors Dc shunt motors are used for driving Machine tools Trains Cranes Hoist Machine tools Trains Cranes Hoist ANSWER DOWNLOAD EXAMIANS APP
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