Instructor: Dr. A. Elnady Name: Answer all questions: Transformers and Circuits: Select and circle the correct or the mo

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Instructor Dr A Elnady Name Answer All Questions Transformers And Circuits Select And Circle The Correct Or The Mo 1 (45.15 KiB) Viewed 59 times

Instructor: Dr. A. Elnady Name: Answer all questions: Transformers and Circuits: Select and circle the correct or the most correct answer 1- The single phase transformer connected to a capacitive load, pure capacitive. When voltage regulation decreases, that means a. b. C d. e. b. C. d. d e. 2- An inductive load can cause the secondary voltage of the transformer to rise above its rated value with any load current steadily decrease with an increasing load current steadily increase above its rated value with a decreasing load current remain constant with an increasing load current non of the above a. b. C. d. 3- From just the measurements of the short circuit test and open circuit test of the single-phase transformer, we can calculate the efficiency of the transformer 2. Electrical Power Engineering Laboratory Final Exam- Part 1- Wednesday Section Spring 2013 نه دل که b. C. ID: the above statement is wrong, we cannot calculate the efficiency from just the measurements of these tests only non of the above 4-Why is the ideal-transformer turns ratio different from the no-load actual-transformer turns ratio? the above question is wrong and they should be equal because of core losses d. Time allowed: 40 minutes the reactance of the load is increased the reactance of the load is decreased the reactance of the load is unchanged, but the transformer current is changed the core loss is changed non of the above if the power factor is given only if the type of the load is given only if R Xm, Re Xe, are calculated because of the internal impedance of the primary winding because of the total impedance of the whole transformer non of the above