Electrical Machines The speed of stator rotating magnetic field (RMF) with respect to rotor is Zero Nr Ns S.Ns Zero Nr Ns S.Ns ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is some what less than 230 V not possible 230 V some what more than 230 V some what less than 230 V not possible 230 V some what more than 230 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is asynchronous motor. asynchronous generator. synchronous motor. synchronous generator. asynchronous motor. asynchronous generator. synchronous motor. synchronous generator. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then Ia remains constant but ωm increase both decrese Ia increases and ωm decreses both armature current Ia and speed ωm increase Ia remains constant but ωm increase both decrese Ia increases and ωm decreses both armature current Ia and speed ωm increase ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Motors for fans and pumps are selected in the rpm range 375 to 500. 720 to 920. 500 to 720. 1440 to 2880. 375 to 500. 720 to 920. 500 to 720. 1440 to 2880. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be 460 V 230 V 65 V 115 V 460 V 230 V 65 V 115 V ANSWER DOWNLOAD EXAMIANS APP
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