Electrical Machines Maximum power developed depends on voltage reactance both 1and 2 load angle voltage reactance both 1and 2 load angle ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process? 40% 68% 60% 38% 40% 68% 60% 38% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages? Delta side lags by -30°. Star side leads by 30°. Delta side leads by 30°. Star side lags by -30°. Delta side lags by -30°. Star side leads by 30°. Delta side leads by 30°. Star side lags by -30°. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will improve and the speed rises. improve and the speed falls. deteriorate and the speed rises. deteriorate and the speed falls. improve and the speed rises. improve and the speed falls. deteriorate and the speed rises. deteriorate and the speed falls. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The synchronous reactance( Xs) is the combined reactance due to armature reaction and leakage flux reactance due to leakage flux reactance either due to armature reaction or leakage flux reactance due to armature reaction of the machine combined reactance due to armature reaction and leakage flux reactance due to leakage flux reactance either due to armature reaction or leakage flux reactance due to armature reaction of the machine ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A compound dc generator is delivering full load current at a terminal voltage of 230 V. Its series-field winding gets short circuited. If its terminal voltage 1. becomes more than 230 V, it is overcompounded generator 2. becomes more than 230 V, it is differentially compounded generator 3. becomes less than 230 V, it is overcompounded generator 4. becomes less than 230 V, it is differentially compounded generator 5. becomes less than 230 V, it is level compounded generator From these, the correct answer is 2, 3, 5 1, 4, 5 1, 4 2,3 2, 3, 5 1, 4, 5 1, 4 2,3 ANSWER DOWNLOAD EXAMIANS APP
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