Electrical Machines A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is 4/3. 9/16. 3/4. 16/9. 4/3. 9/16. 3/4. 16/9. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motor used in hair dryers? Split phase IM. Shaded pole IM. Synchronous motors. Cage induction motor. Split phase IM. Shaded pole IM. Synchronous motors. Cage induction motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is/are the necessary conditions for voltage build up in self excited generator? Field winding resistance should be less than critical resistance. Field winding should be properly connected to armature winding. All of these Poles should contain residual flux. Field winding resistance should be less than critical resistance. Field winding should be properly connected to armature winding. All of these Poles should contain residual flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The rotor speed of an induction motor is given by None of these Nr = 120f / p × (1-s). Ns = 120f /p × ( 1 - r). Ns = 120f / p × ( 1 - s ). None of these Nr = 120f / p × (1-s). Ns = 120f /p × ( 1 - r). Ns = 120f / p × ( 1 - s ). ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following represents the rotating losses of machine? Eddy current losses Hysteresis losses Friction and windage losses All of the them Eddy current losses Hysteresis losses Friction and windage losses All of the them ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up more than 220 V somewhat less than 220 V 6 V 220 V more than 220 V somewhat less than 220 V 6 V 220 V ANSWER DOWNLOAD EXAMIANS APP
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