B.Tech. (AE) (Sem.-6th)
MEASUREMENT AND INSTRUMENTATION
Subject Code : AE-306
Paper ID : [Ao721]
Time : 3
Hrs. Max. Marks: 60
INSTRUCTION TO
CANDIDATES
1. SECTION -A is
COMPULSORY.
2. Attempt any FOUR
questions from SECTION-B.
3. Attempt any TWO
questions from SECTION -C.
SECTION-A
1. Write
short notes on
(a) Define
Standard and Calibration.
(b) What is
selective radiation pyrometer?
(c) For the
given data calculate Mean and Standard deviation of the given data.
12,13,12,l4,13,14,15,11,13,10,12,13,14,13,13,10,13,15,13.
(d) Define
Speed of Response, Fidelity, Dead time and Dead zone.
(e) What is
method of least square? Write down its significance.
(f) If two
resistances R1: 5009 i 5% and R2 = 4.7kQ i 4% are in series combination, then
what would be the probable error in the total resistance.
(g) What are
Magneto-strictive transducers? How they can be used in instrumentation?
(h) Briefly
explain the principle of photo conductive transducers.
(i) Why
Piezeo-Electric transducer is called a dynamic transducer?
(1') What is
data acquisition system? Draw its basic building blocks.
SECTION-B
2. Why we
use Three lead or Four lead - RTD? Explain with help of a diagram and related
mathematical equations.
3. What is
Pyrometery? Explain the physical laws on which it is based upon. Elaborate the
working of Optical pyrometer.
4. Drive the
mathematical expression and draw the response of voltage across a capacitor in
a RC circuit when a step input is applied to it. Hence from this define Time
constant.
5. Prove
that the differential arrangement of capacitive transducers increases the
linearity, when the distance between the plates is used as mean of change in
capacitance.
6. A PZT
Crystal having thickness of 2mm and voltage sensitivity of 0.055Vm/N is subjected
to a press of 1.5MN/m2. Calculate the voltage output if the permittivity of
quartz is 40.6 x 10-12 F/m. Also calculate charge sensitivity.
SECTION-C
7. Write
down the Principle, related mathematical equations, construction and working of
Magnetic flow meter with the help of a neat diagram. Also write its merits
& demerits. Compare this flow meter with other flow meters.
8. What is
thermocouple? Explain its construction and working principle. The cold junction
of a thermocouple is connected to a potentiometer terminal having a temperature
of 24°C. The potentiometer reads 25.76 mV. What is the temperature of the Hot junction?
The calibration chart of the Thermocouple is
Temp.
°C
|
20
|
24
|
28
|
.......... 420
|
|
440
|
460
|
Voltage
mV
|
0.8
|
0.95
|
|
1.12
|
26.25
|
26.72
|
26.84
|
9. Write
down the Principle, related mathematical equations, construction and working of
Strain gauge with the help of a diagram. Also mention its various types, compensation methods and applications.
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