Transformers MCQs - Quiz 5

1. If the secondary of a 1 : 8 transformer is connected to the primary of a 1 : 5 transformer then the total transformation ratio will be ___.
A) 13
B) 5
C) 15
D) 40

The correct answer is D

2. A transformer having 100 turns in primary winding is given 200 V AC. In order to get 400 V AC at secondary winding the number of turns in secondary winding must be ___.
A) 100
B) 200
C) 300
D) 400

The correct answer is B

3. Which of the following transformers will be largest in size?
A) 10 kVA, 25 Hz
B) 10 kVA, 50 Hz
C) 10 kVA, 75 Hz
D) 10 kVA, 100 Hz

The correct answer is D

4. ___ is not a part of transformer.
A) Conservator
B) Breather
C) Exciter
D) Buchholz relay

The correct answer is C

5. Air Forced cooling is used for transformers up to a rating of ___.
A) 3000 kVA
B) 1500 kVA
C) 1000 kVA
D) 250 kVA

The correct answer is A

6. Transformer breaths in when load ___.
A) increases
B) decreases
C) remains constant
D) None of the above

The correct answer is B

7. The noise resulting from vibrations in a transformer is called ___.
A) humming
B) hysteresis
C) magnetization
D) buzzing

The correct answer is A

8. A distribution transformer has maximum efficiency at ___
A) Full load
B) No load
C) 50 % of full load
D) 80 % of full load

The correct answer is C

9. The resistance between primary and secondary in a transformer is ___
A) 10 ohms
B) 100 ohms
C) Infinity
D) Zero

The correct answer is C

10. Transformer oil must be free from ___
A) Gases
B) Moisture
C) Odour
D) Carbon

The correct answer is B