DC Motors If conditions for maximum power for a dc motor are established, the efficiency of the motor will be Less than 50% 80 to 90 % 60 to 70 % 100 % Less than 50% 80 to 90 % 60 to 70 % 100 % ANSWER DOWNLOAD EXAMIANS APP
DC Motors Excessive sparking at brushes may be caused due to Dirt on the commutator Misaligment of machine Worn bearings Loose coupling Dirt on the commutator Misaligment of machine Worn bearings Loose coupling ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc machines the residual magnetism is of the order of 2 to 3 percent 20 to 25 percent 50 to 75 percent 10 to 15 percent 2 to 3 percent 20 to 25 percent 50 to 75 percent 10 to 15 percent ANSWER DOWNLOAD EXAMIANS APP
DC Motors A dc series motor is best suited for driving Cranes and hoists Shear and punches Machine tools None of the listed here Cranes and hoists Shear and punches Machine tools None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors If the speed of a dc shunt motor is increased the back emf of the motor will Decrease Increase Remains same Become zero Decrease Increase Remains same Become zero ANSWER DOWNLOAD EXAMIANS APP
DC Motors The torque developed by a dc motor is directly proportional to Armature resistance × applied voltage Flux per pole × armature current None of the listed here Armature resistance × armature current Armature resistance × applied voltage Flux per pole × armature current None of the listed here Armature resistance × armature current ANSWER DOWNLOAD EXAMIANS APP
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