DC Motors The speed of a dc motor can be controlled by changing Is flux Aplied voltage All of the listed here Armature circuit resistance Is flux Aplied voltage All of the listed here Armature circuit resistance ANSWER DOWNLOAD EXAMIANS APP
DC Motors Excessive sparking at brushes may be caused due to Worn bearings Misaligment of machine Loose coupling Dirt on the commutator Worn bearings Misaligment of machine Loose coupling Dirt on the commutator ANSWER DOWNLOAD EXAMIANS APP
DC Motors Carbon brushes are preferable to copper brushes because _____ They reduce sparking 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 ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which of the following motor is preferred for operation in highly explosive atmosphere? Battery operated motor Series motor Shunt motor Air motor Battery operated motor Series motor Shunt motor Air motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors The commutating winding is basically used in a dc machine To control the speed of machine To reduce armature reaction To improve commutation None of the listed here To control the speed of machine To reduce armature reaction To improve commutation None of the listed here 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 and power both will change Torque will remain constant Torque, power and speed, all will change Torque will change but power will remain constant Torque and power both will change Torque will remain constant Torque, power and speed, all will change ANSWER DOWNLOAD EXAMIANS APP
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