DC Motors Usually wide and sensitive speed control is desired in case of Colliery winders Elevators Steel rolling mills Centrifugal pumps Colliery winders Elevators Steel rolling mills Centrifugal pumps ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor Of lower H.P. should be selected Of higher H.P. should be selected Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor Can be used for 50°C ambient temperature also Of lower H.P. should be selected Of higher H.P. should be selected Is to be de-rated by a factor recommended by manufacturer and select the next higher H.P. motor Can be used for 50°C ambient temperature also ANSWER DOWNLOAD EXAMIANS APP
DC Motors Ward-Leonard control is basically a Field control method Voltage control method Armature resistance control method Field divertor method Field control method Voltage control method Armature resistance control method Field divertor method ANSWER DOWNLOAD EXAMIANS APP
DC Motors The torque developed by a dc motor is directly proportional to Armature resistance × armature current None of the listed here Armature resistance × applied voltage Flux per pole × armature current Armature resistance × armature current None of the listed here Armature resistance × applied voltage Flux per pole × armature current ANSWER DOWNLOAD EXAMIANS APP
DC Motors D.C. series motors are used 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 Where load changes frequently ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a dc motor is comnected across the AC supply it will Burn due to heat produced in the field winding by eddy currents Run at normal speed Not run Run at lower speed Burn due to heat produced in the field winding by eddy currents Run at normal speed Not run Run at lower speed ANSWER DOWNLOAD EXAMIANS APP
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