Discussion
Consider the following statements about profile drag.
1. It includes a contribution from skin friction.
2. It includes a contribution from boundary layer displacement.
3. It falls to zero at the zero-lift angle of attack.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are the two components of profile drag: direct skin friction, and the pressure drag that arises because the boundary layer displaces the outer flow and prevents full pressure recovery. Statement 3 is wrong - profile drag is a minimum near the zero-lift angle but never vanishes, since the air is still flowing over the surface.
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