Discussion
A section has a lift curve slope of \(0.11\) per degree and a zero-lift angle of \(-2^\circ\). Its lift coefficient at \(6^\circ\) is about
Answer: A
Correct answer: 0.88
The lift coefficient is proportional to the angle measured from the zero-lift angle, not from the chord line: \[ c_l = a_0(\alpha - \alpha_{L=0}) = 0.11\,(6 - (-2)) = 0.11 \times 8 = 0.88. \] Measuring from zero incidence instead gives 0.66, which is offered as a distractor. For a cambered section the zero-lift angle is negative, so the effective angle is always the larger of the two.
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