DC Motors If conditions for maximum power for a dc motor are established, the efficiency of the motor will be 80 to 90 % 60 to 70 % 100 % Less than 50% 80 to 90 % 60 to 70 % 100 % Less than 50% 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 Twice One-third Half None of the listed here Twice One-third Half ANSWER DOWNLOAD EXAMIANS APP
DC Motors The rheostatic speed control method is very Suitable for getting speeds above the normal Economical Unsuitable for rapidly changing loads Efficient Suitable for getting speeds above the normal Economical Unsuitable for rapidly changing loads Efficient ANSWER DOWNLOAD EXAMIANS APP
DC Motors Small dc motors up to 5 HP usually have 2 poles 8 poles 4 poles 6 poles 2 poles 8 poles 4 poles 6 poles ANSWER DOWNLOAD EXAMIANS APP
DC Motors The value of back emf in dc motor is maximum at Full load Half full load No load None of the listed here Full load Half full load No load None of the listed here ANSWER DOWNLOAD EXAMIANS APP
DC Motors The running speed of a dc series motor is basically determined by None of the listed here Field excitation Armature reaction Load None of the listed here Field excitation Armature reaction Load ANSWER DOWNLOAD EXAMIANS APP
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