DC Motors For a D.C. shunt motor if the excitation is changed Torque will change but power will remain constant Torque will remain constant Torque and power both will change Torque, power and speed, all will change Torque will change but power will remain constant Torque will remain constant Torque and power both will change Torque, power and speed, all will change ANSWER DOWNLOAD EXAMIANS APP
DC Motors The speed of a series motor at no load is 2000 rpm Infinity 4000 rpm 1000 rpm 2000 rpm Infinity 4000 rpm 1000 rpm ANSWER DOWNLOAD EXAMIANS APP
DC Motors The commutating winding is basically used in a dc machine None of the listed here To reduce armature reaction To improve commutation To control the speed of machine None of the listed here To reduce armature reaction To improve commutation To control the speed of machine ANSWER DOWNLOAD EXAMIANS APP
DC Motors What will happen if the back emf of a dc motor vanishes suddenly? The motor will run noisy The motor will stop The motor will continue to run The armature may burn The motor will run noisy The motor will stop The motor will continue to run The armature may burn ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens Motor will come to stop 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 Nothing will happen to motor Motor will come to stop 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 Nothing will happen to motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors Small dc motors up to 5 HP usually have 2 poles 4 poles 6 poles 8 poles 2 poles 4 poles 6 poles 8 poles ANSWER DOWNLOAD EXAMIANS APP
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