Transformer MCQs Part 1.
Contents
- 1 The value of flux involved in the EMF equation of a transformer is
- 2 No-load current in a transformer
- 3 The Buchholz relay can be installed on
- 4 Natural air cooling is usually restricted for transformers up to
- 5 The no-load current drawn by the transformer is typically what percent of the full-load current
The value of flux involved in the EMF equation of a transformer is
The value of flux involved in the EMF equation of a transformer is
- Average value
- Maximum value
- Rms value
- Instantaneous value
Correct answer: 2. Maximum value
No-load current in a transformer
No-load current in a transformer
- Lags behind the voltage by about 15°
- Leads the voltage by about 15°
- Lags behind the voltage by about 75°
- Leads the voltage by about 75°
Correct answer: 3. Lags behind the voltage by about 75°
The Buchholz relay can be installed on
The Buchholz relay can be installed on
- Auto-transformers
- Welding transformers
- Oil cooled transformers
- Air-cooled transformers
Correct answer: 3. Oil cooled transformers
Natural air cooling is usually restricted for transformers up to
Natural air cooling is usually restricted for transformers up to
- 1.5 MVA
- 5 MVA
- 15 MVA
- 50 MVA
Correct answer: 1. 1.5 MVA
The no-load current drawn by the transformer is typically what percent of the full-load current
The no-load current drawn by the transformer is typically what percent of the full-load current
- 0.2 to 0.5 %
- 2 to 5 %
- 12 to 15 %
- 20 to 30 %
Correct answer: 2. 2 to 5 %