B.Tech.
(SEMESTER-I9 TITEORY EXAMTNA:UON,
2O1t_12
TRANSDUCERAND SENSORS Timei3Hoursl
I Section
Total Marks
: 100
-A
l
l.
Attempt all question parts
(a) (b) (") (d) (e) (l) (g) (h) (i) ()
l0x2=20
:
What are active and passive transducers
?
Define threshold and resolution of the instrument. Give any four transducer applications of displacement measurement. Specify any two methods used by tachometer encoders in speed measurements. Draw an idealized model ofan elastic force transducer. Name four forms of manometer.
Give the operating principle of an ultrasonic flowmeter. What are rhe two basic forms of Hot-wire anemometers
?
What are total immersion and partial immersion thermometers What are the two major categories of infrared detectors
Section
Attempt any three question parts
(a) (i)
:
?
?
-B 3
x l0
:
30
Explain the functional elements of an instrumenr. system with the herp of suitablc block diagram.
iii) 0325
Explain the method olhigh-gain feedback ofcorrection for interfering an4 modifl.ing inputs. P,T.Or
,*#SA:-*tif {ie fidlfl-of dia]am'of flo# iioiiG'
venturi"tii66 ariil
Dall flow tube. bimetallic theniro*"iot. Wt ut are the vario,s (d \w,' Exolairi tf,d *oitiug principL of application ;;;;;;;r.l ljr{ii*"tarri; se,rsors, devlrdped do meer various . .reouirements ? ,
t
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l
Sdction'- C
5x10:50
AttemPt all questtons'
2x5=10
Attentpt any two Parts'
(a)
or to explain I de concePts of an instrument Consider a prelure ])De thermometer a measirrement system.
(b)
linearity specification' What is inOependent tinearity ? Explain
(c)
for instruments Explain the varibus hysteresis effects
i:
Attempt any one Part
4.
1x10=10
:
(a)
the basic princiPle of the Write the several differerit ways of implementing
(b)
the three major classes of rligital What are digital trarsducers ? Whai are
5. .:
:
weidable strain gage' resistance strain gage' rExplain the rotary encoders" trarrsducers ? Explain transiotional ;nd
AttemPt any one Pad ,iijili
':
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l!.i
1u;
1x10=10 :
l:
i
' 'r shafts' xflain various methocs of torque rieasurement rotating ,i
,,,r;{f)lr.'l\Vlrat'arethevarioust'ypesofgagesforlow-pressure'(vacuum)measi}Ienlent?
. , o3zJ
r.
Explain Mcleod gage.
I
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i i.id:: Explain,the,*b{ki+glof.piiot.static tubc,.Enlistlth"..aSg,1rs Oo. io whichi th€' diflerence between truti and measured,Values of static pressureexists.' - .'
(b) 7.
Explain in detail with the help of diagrams, the operating theory of Rota meter.
2x5=10,".
Attempt any two parts.
(a)
Give the working principle of radiation type temperature sensors' \Vhat are its disadvantages
?
(b) A resistance thermometer is tO be constructed of nickel wire, Thenloineter resistarice at 20 degrees Celsius
is
100 ohms. What length
wire should be used ? rv\4rat rvould b'e the length
(c)
if
of 0.4 mrn diameter
2 mrn diamcter rvire is used ?
Explain the working principle of cooled thermocoupies.
1,450
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