DC Motors If the supply voltage for a D.C. motor is increased, which of the following will decrease? Operating speed Full-load current All of these Starting torque Operating speed Full-load current All of these Starting torque ANSWER DOWNLOAD EXAMIANS APP
DC Motors In variable speed motor None of these A weaker commutating field is needed at low speed than at high speed Same commutating field is needed at low speed than at high speed A stronger commutating field is needed at low speed than at high speed None of these A weaker commutating field is needed at low speed than at high speed Same commutating field is needed at low speed than at high speed A stronger commutating field is needed at low speed than at high speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which of the following motors is most suitable for signalling devices and many kinds of timers ? Reluctance motor C. shunt motor Induction motor C. series motor Reluctance motor C. shunt motor Induction motor C. series motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors For the same H.P. rating and full load speed, following motor has poor starting torque Differentially compounded Shunt Series Cumulatively compounded Differentially compounded Shunt Series Cumulatively compounded ANSWER DOWNLOAD EXAMIANS APP
DC Motors If conditions for maximum power for a dc motor are established, the efficiency of the motor will be Less than 50% 60 to 70 % 80 to 90 % 100 % Less than 50% 60 to 70 % 80 to 90 % 100 % ANSWER DOWNLOAD EXAMIANS APP
DC Motors In the dc motor the iron losses occur in Brushes Commutator Field Armature Brushes Commutator Field Armature ANSWER DOWNLOAD EXAMIANS APP
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