DC Motors In a dc motor if the back emf is absent Motor will not run at all Motor will run at very high speed Motor will run at very slow speed Motor will burn Motor will not run at all Motor will run at very high speed Motor will run at very slow speed Motor will burn ANSWER DOWNLOAD EXAMIANS APP
DC Motors The back emf in a dc motor ______ None of the listed here Aids the armature current Opposes the applied voltage Aids the applied voltage None of the listed here Aids the armature current Opposes the applied voltage Aids the applied voltage ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which of the following losses are significantly reduced by laminating the core of a D.C. generator? Windage losses Eddy current losses Hysteresis losses Copper losses Windage losses Eddy current losses Hysteresis losses Copper losses ANSWER DOWNLOAD EXAMIANS APP
DC Motors The maximum end play of a motor is about 10 mm 0.4 mm 6 mm 2 mm 10 mm 0.4 mm 6 mm 2 mm ANSWER DOWNLOAD EXAMIANS APP
DC Motors Which one of the following is not the function of pole shoes in a D.C. machine? To reduce eddy current loss To spread out flux for better uniformity To support the field coils To reduce the reluctance of the magnetic path To reduce eddy current loss To spread out flux for better uniformity To support the field coils To reduce the reluctance of the magnetic path ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to 10% of the previous value 25% of the previous value 100% of the previous value 50% of the previous value 10% of the previous value 25% of the previous value 100% of the previous value 50% of the previous value ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS