Electrical Engineering MCQs on Transformer Part 31 – Transformers Multiple Choice Questions
Contents
- 1 The transformer insulation material that is best compared to Kraft paper
- 2 Insulation of HVDC transformers should be
- 3 Transformer oil must be free from
- 4 Generally, a transformer transfers electrical energy from primary to secondary with a change in
- 5 A 200 kVA transformer has full-load Cu loss of 2000 W. It will have maximum efficiency for load having value
The transformer insulation material that is best compared to Kraft paper
The transformer insulation material that is best compared to Kraft paper:
- Asbestos
- Cotton
- Low grade pressboard
- Oil
Correct answer: 4. Oil
Insulation of HVDC transformers should be
Insulation of HVDC transformers should be:
- Dry always
- Wet always
- Any of above
- HVDC transformers have no insulation
Correct answer: 1. Dry always
Transformer oil must be free from
Transformer oil must be free from:
- Odour
- Gases
- Moisture
- Sulphur
Correct answer: 3. Moisture
Generally, a transformer transfers electrical energy from primary to secondary with a change in
Generally, a transformer transfers electrical energy from primary to secondary with a change in:
- Frequency
- Voltage
- Power
- Time period
Correct answer: 2. Voltage
A 200 kVA transformer has full-load Cu loss of 2000 W. It will have maximum efficiency for load having value
A 200 kVA transformer has full-load Cu loss of 2000 W. It will have maximum efficiency for load having value:
- 25 kVA
- 50 kVA
- 100 KVA
- 200 kVA
Correct answer: 3. 100 KVA
Explanation:
Solution:
Load for maximum efficiency = Full load kVA * (Iron loss/ Full load Cu loa4. ^1/2
= 200 * (500/2000)
= 100 kVA