DC Motors If a dc motor is comnected across the AC supply it will Run at lower speed Not run Burn due to heat produced in the field winding by eddy currents Run at normal speed Run at lower speed Not run Burn due to heat produced in the field winding by eddy currents Run at normal speed ANSWER DOWNLOAD EXAMIANS APP
DC Motors In D.C. motor which of the following can sustain the maximum temperature rise? Slip rings Armature winding Field winding Commutator Slip rings Armature winding Field winding Commutator ANSWER DOWNLOAD EXAMIANS APP
DC Motors The speed of a series motor at no load is 4000 rpm 2000 rpm Infinity 1000 rpm 4000 rpm 2000 rpm Infinity 1000 rpm 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 % 100 % 80 to 90 % Less than 50% 60 to 70 % 100 % 80 to 90 % ANSWER DOWNLOAD EXAMIANS APP
DC Motors The commutating winding is basically used in a dc machine To control the speed of machine To improve commutation None of the listed here To reduce armature reaction To control the speed of machine To improve commutation None of the listed here To reduce armature reaction ANSWER DOWNLOAD EXAMIANS APP
DC Motors The rheostatic speed control method is very Efficient Suitable for getting speeds above the normal Unsuitable for rapidly changing loads Economical Efficient Suitable for getting speeds above the normal Unsuitable for rapidly changing loads Economical ANSWER DOWNLOAD EXAMIANS APP
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