Discussion
Supplying 13 kg of air per kg of that coal against a theoretical 10.8 kg represents excess air of about
Answer: D
Correct answer: 20 per cent
Excess air is the surplus expressed as a fraction of the theoretical requirement: \[ \frac{13 - 10.8}{10.8} = \frac{2.2}{10.8} = 0.204 \approx 20\ \text{per cent.} \] The denominator is the theoretical air, not the air actually supplied - dividing by 13 would give 17 per cent and is the usual error. Twenty per cent is a reasonable figure for a well-run coal fired boiler.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development