Electrical Machines In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages? Star side leads by 30°. Delta side lags by -30°. Star side lags by -30°. Delta side leads by 30°. Star side leads by 30°. Delta side lags by -30°. Star side lags by -30°. Delta side leads by 30°. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is (1/2)Fmax. 3Fmax. Fmax. (3/2)Fmax. (1/2)Fmax. 3Fmax. Fmax. (3/2)Fmax. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In most condition which frame of motor will be preferred? Totally enclosed fan coiled. Open type. Drip proof. Splash proof. Totally enclosed fan coiled. Open type. Drip proof. Splash proof. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Direction of the current in the compensating winding is________ to the direction of current in the armature conductors? same either of these exactly opposite None of these same either of these exactly opposite None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When excitation is increased (over excitation), the synchronous generator operates at leading power factor. lagging power factor. any of the above. unity power factor. leading power factor. lagging power factor. any of the above. unity power factor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The main purpose of providing tertiary winding in a three phase transformer is to interconnect three voltage systems. to suppress harmonic and unbalance in voltage. None of these to carry extra load. to interconnect three voltage systems. to suppress harmonic and unbalance in voltage. None of these to carry extra load. ANSWER DOWNLOAD EXAMIANS APP
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