Transformers MCQs - Quiz 4

1. For performing short circuit test which winding should be short circuited?
A) Low voltage
B) High voltage
C) Secondary
D) Primary

The correct answer is A

2. Losses occuring during short circuit test are considered ___ losses only because other losses are negligibly small.
A) Iron
B) Copper
C) Hysteresis
D) Eddy current

The correct answer is B

3. The problem of voltage rise/drop occuring due to increasing/decreasing voltage is handled with the help of ___.
A) Buchholz relay
B) Breather
C) Tap changer
D) None of above

The correct answer is C

4. Tap changers are used to adjust the ___ of transformer.
A) Temperature
B) Oil level
C) Turns ratio
D) All of above

The correct answer is C

5. If R is a resistance at secondary side of a transformer and k is transformation ratio, then the equivalent resistance R' as reffered to primary is ___.
A) R/(k²)
B) R/2k
C) 2R/k
D) R²/k

The correct answer is A

6. Buchholz relay is operared by ___.
A) Current
B) Voltage
C) Gas
D) None of above

The correct answer is C

7. ___ losses vary highly with load.
A) Copper
B) Iron
C) Hysteresis
D) Eddy current

The correct answer is A

8. Buchholz relay is used in ___ transformers.
A) Dry type
B) Oil cooled
C) Distribution
D) None of above

The correct answer is B

9. High frequency transformers use ___ cores.
A) Copper
B) Aluminum
C) Ferrite
D) None of above

The correct answer is C

10. Step up transformers increase ___
A) Current
B) Voltage
C) Power
D) Frequency

The correct answer is B