Jawaharlal Nehru Technological University Hyderabad 2010-2nd Sem M.Tech Aerospace Engineering Regular s, AEROSPACE SENSORS AND MEASUREMENT SYSTEMS - Question Paper

Code No: D7604
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
M.Tech II - Semester Regular Examinations, October 2010
AEROSPACE SENSORS AND MEASUREMENT SYSTEMS
(AEROSPACE ENGINEERING)
Time: 3hours Max. Marks: 60
ans any 5 ques.
All ques. carry equal marks
- - -

1. a) discuss statistical analysis of experimental data.
b) A certain steel bar is measured with a device which has a known precision of
+ five mm to – five mm when a large number of measurements is taken. How many
such measurements are necessary to establish the mean length 'a' with a five percent
of significance such that a = a + / - 0.2 mm.

2. define the subsequent flow measurement systems
a) Pressure transducers
b) Thermocouples
c) Particle velocimetry.

3. a) describe path lines, streak lines, time lines and stream lines.
b) define the different methods of surface flow visualization.

4. define 3 external balances for measurements in wind tunnel.

5. a) elaborate the vibrational measuring instruments and discuss the working
principle of any 1 instrument.
b) Cantilever beam of span 3m made of steel of cross sectional area 10mm x
20mm is subjected to a free end transverse load of 4KN, along the depth.
Determine the natural frequency of vibration. If the beam used as a simply
supported beam loading at center, determine the frequency of vibration.

6. discuss the working principle of piezo electric sensors to measure acceleration.

7. Write short notes on the subsequent
a) Infrared earth sensors
b) Magnetometers.

8. A rectangle rosette is mounted on a steel plate having E = 2×105
N/ mm2
and
µ = 0.3. The 3 strains are measured as
€1 = +500µ mm/ mm
€2 = +400µ mm/mm
€3 = -100 µ mm/mm
compute the principal strains and stress and maximum shear stress. Locate the
axis of the principle stress.

Earning:   Approval pending.