Transformers MCQs - Quiz 3

1. Which of the following is a transformer cooling method?
A) ONAN
B) ONAF
C) OFAF
D) All of above

The correct answer is D

2. Which of the following is a cooling method for dry type transformers?
A) AN (Air Natural)
B) AF (Air Forced)
C) Both A & B
D) None of above

The correct answer is C

3. Which of the following cooling methods does not require use of energy?
A) OFAF
B) ONAF
C) ONAN
D) OFAN

The correct answer is C

4. ___ is used to capture any moisture or solid particles in oil.
A) Tank
B) Tap changer
C) Breather
D) Core

The correct answer is C

5. Buchholz is a type of ___.
A) Steel alloy
B) Relay
C) Tap changer
D) Transformer

The correct answer is B

6. Neutral of distribution transformer is earthed for ___
A) Safety
B) Balancing of voltages
C) Both A & B
D) None of above

The correct answer is C

7. Can two transformers be operated in parallel?
A) Yes
B) No

The correct answer is A

8. What conditions must be met for parallel operation of single phase transformers?
A) Transformation ratio should be same
B) Percentage voltage regulation should be same
C) Polarity should be same
D) All of above

The correct answer is D

9. What conditions must be met for parallel operation of three phase transformers?
A) Transformation ratio should be same
B) Phase sequence should be same
C) Percentage voltage regulation should be same
D) Phase notation should be same
E) All of above

The correct answer is E

10. How are the winding of distribution transformers normally connected?
A) Star-Star
B) Delta-Delta
C) Delta-Star
D) Star-Delta

The correct answer is C