DC Motors If conditions for maximum power for a dc motor are established, the efficiency of the motor will be 80 to 90 % 100 % 60 to 70 % Less than 50% 80 to 90 % 100 % 60 to 70 % Less than 50% ANSWER DOWNLOAD EXAMIANS APP
DC Motors The main disadvantage of the Ward-Leonard control method is Low efficiency at high loads High maintenance cost High initial cost All of these Low efficiency at high loads High maintenance cost High initial cost All of these ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc compound machine, Shunt field winding plays dominant role Either can play dominant role Both play equally dominant role Series field winding plays dominant role Shunt field winding plays dominant role Either can play dominant role Both play equally dominant role Series field winding plays dominant role 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, power and speed, all will change Torque will remain constant Torque and power both will change Torque will change but power will remain constant Torque, power and speed, all will change Torque will remain constant Torque and power both will change ANSWER DOWNLOAD EXAMIANS APP
DC Motors Three point starter can be used for Compound motor only Shunt motor only Series motor only Both shunt and compound motor Compound motor only Shunt motor only Series motor only Both shunt and compound motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors The resistance of shunt field winding as compared to series field winding is Less The same None of the listed here More Less The same None of the listed here More ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS