Electrical Machines What is power factor of a 3 - φ induction motor at no load? High. Low. Equal to 1. Same as full load. High. Low. Equal to 1. Same as full load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ? 150 V. 210 V 230 V. 240 V. 150 V. 210 V 230 V. 240 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For an ideal transformer the winding should have equal resistance on primary and secondary side minimum resistance on primary side and maximum resistance on secondary side no ohmic resistance on either side maximum resistance on primary side and least resistance on secondary side equal resistance on primary and secondary side minimum resistance on primary side and maximum resistance on secondary side no ohmic resistance on either side maximum resistance on primary side and least resistance on secondary side ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements : Interpoles in dc machines 1. reducearmature reaction effects in the interpolar region 2. have the same dimension as main polls 3. have their windings connected in series with the armature 4. have same number of turns as the armature 5. have the polarity same as that of the main pole ahead in a motor From these, the correct statements are 1 and 3 1, 2 and 3 1, 2, 3 and 5 1, 3 and 5 1 and 3 1, 2 and 3 1, 2, 3 and 5 1, 3 and 5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generators brushes are used for collecting of current without any sparkings reduce eddy current loss collecting of voltage convert ac armature current in to dc collecting of current without any sparkings reduce eddy current loss collecting of voltage convert ac armature current in to dc ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In which of the following speed control of DC motor the speed obtained is below than the rated speed? Field resistance control. Armature voltage control. Armature circuit resistance control. Any of above. Field resistance control. Armature voltage control. Armature circuit resistance control. Any of above. ANSWER DOWNLOAD EXAMIANS APP
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