DC Motors Which of the following motor is preferred for operation in highly explosive atmosphere? Air motor Series motor Battery operated motor Shunt motor Air motor Series motor Battery operated motor Shunt motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors In variable speed motor A weaker commutating field is needed at low speed than at high speed None of these A stronger commutating field is needed at low speed than at high speed Same commutating field is needed at low speed than at high speed A weaker commutating field is needed at low speed than at high speed None of these A stronger commutating field is needed at low speed than at high speed Same commutating field is needed at low speed than at high speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc motor constant torque is produced due to Pole shoes Rotor laminations End plates Commutator Pole shoes Rotor laminations End plates Commutator ANSWER DOWNLOAD EXAMIANS APP
DC Motors The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is 6.77% 4.76% 2.22% 8.85% 6.77% 4.76% 2.22% 8.85% ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens This will make armature to take heavy current, possibly burning it This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses Motor will run at very slow speed Nothing will happen to the motor This will make armature to take heavy current, possibly burning it This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses Motor will run at very slow speed Nothing will happen to the motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be Under compounded Cumulatively compounded Level compounded Differentially compounded Under compounded Cumulatively compounded Level compounded Differentially compounded ANSWER DOWNLOAD EXAMIANS APP
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