DC Motors The direction of rotation of a D.C. series motor can be changed by Either of (A) and (B) above None of these Interchanging supply terminals Interchanging field terminals Either of (A) and (B) above None of these Interchanging supply terminals Interchanging field terminals ANSWER DOWNLOAD EXAMIANS APP
DC Motors The mechanical power developed in a dc motor is maximum when back emf is equal to _____ the applied voltage. None of the listed here Half Twice One-third None of the listed here Half Twice One-third ANSWER DOWNLOAD EXAMIANS APP
DC Motors In variable speed motor 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 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 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 result in excessive speed, possibly destroying armature due to excessive centrifugal stresses This will make armature to take heavy current, possibly burning it Nothing will happen to motor Motor will come to stop This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses This will make armature to take heavy current, possibly burning it Nothing will happen to motor ANSWER DOWNLOAD EXAMIANS APP
DC Motors If a dc motor is comnected across the AC supply it will Not run Run at lower speed Run at normal speed Burn due to heat produced in the field winding by eddy currents Not run Run at lower speed Run at normal speed Burn due to heat produced in the field winding by eddy currents ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which of the following in a dc motor, can sustain the maximum temperature rise? Slip rings Field winding Armature winding Commutator Slip rings Field winding Armature winding Commutator ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS