Q4. A. Explain how the efficiency and regulation of a transformer can be assessed by open circuit and short circuit tests?
B. What is meant by equivalent resistance?
Q3. With respect to power transformers kindly explain the following protections
1. Overload protection 2. Overcurrent protection for phase faults 3. Earth Fault protection 4. Differential protection 5. Directional protection
Q3. A. Explain how the efficiency and regulation of a transformer can be assessed by open circuit and short circuit tests? (8)
B. What is meant by equivalent resistance? (4)
C. What is meant by all day transformer efficiency? (4)
Q4. a) List the applications of CT and PT (Current and voltage Transformers). (6)
b) Sketch and describe any one type of current Transformer. (10)
Q1. a) What are the effects of voltage and frequency changes on transformer functioning? (8)
b) State the various energy losses in transformers. (8)
Q3. a) Explain how the efficiency and regulation of a transformer can be assessed by open circuit and short circuit tests? (12) b) What is meant by equivalent resistance. (4)
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