Discussion
A non-oscillatory longitudinal root lies at \( -0.5 \ \mathrm{s^{-1}} \). The time constant of the resulting subsidence is
Answer: A
The time constant is the reciprocal of the magnitude of the real root, \( \tau = 1/0.5 = 2.0 \ \mathrm{s} \), so the disturbance falls to about 37 per cent of its initial value in two seconds. 0.5 s is the root itself read back as a time. 1.39 s is the time to half amplitude, \( \ln 2/0.5 \), which is a different and equally useful measure but not the time constant. 0.69 s halves that again. Keeping the three apart matters in flight test reporting, since requirements are written sometimes in time constants and sometimes in times to half amplitude.
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