TRANSFORMER

Question 1

1. Transformer works on the principle of?
   A. Self and mutual induction
   B. Self induction
   C. Mutual induction
   D. None of these

Answer 1

A. Self and mutual induction

Question 2

2. The path of the magnetic flux in a transformer has?
   A. Low reluctance
   B. High reluctance
   C. Low resistance
   D. High conductivity

Answer 2

A. Low reluctance

Question 3

3. Which of the following losses can be minimized by laminating the core of a transformer?
   A. Eddy current loss
   B. Hysteresis loss
   C. Heat loss
   D. All of the above

Answer 3

A. Eddy current loss

Question 4

4. Open circuit test of a transformer gives?
   A. Sum of hysteresis and eddy current loss
   B. Copper loss
   C. Hysteresis loss
   D. Eddy current loss

Answer 4

A. Sum of hysteresis and eddy current loss

Question 5

5. For transformer, the condition for maximum efficiency is?
   A. Copper loss = iron loss
   B. Copper loss = hysteresis loss
   C. Hysteresis loss = eddy current loss
   D. Copper loss = eddy current loss

Answer 5

A. Copper loss = iron loss

Question 6

6. In a transformer which loss varies significant with load?
   A. Copper loss
   B. Core loss
   C. Eddy current loss
   D. Hysteresis loss

Answer 6

A. Copper loss

Question 7

7. At what pf a transformer operates?
   A. At pf depending on the pf of the load
   B. Always unity pf
   C. At a pf below a particular value
   D. None of these

Answer 7

A. At pf depending on the pf of the load

Question 8

8. As compared to an amplifier, a transformer cannot?
   A. Increase output power
   B. Increase output voltage
   C. Increase output current
   D. None

Answer 8

A. Increase output power