Instrumentation System Design JAN 2014

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Question Paper for PGICE-13 Batch of M.Tech 1st Semester at Sant Longowal Institute of Engineering and Technology, Longowal.

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Instrumentation System Design JAN 2014

  1. 1. Time: 1 Hour . I . >"~ CMl; li”l§>dls3;? ~i A Sl. lli'l‘ Longowal, Minor l: ‘xamination~ l , October, 2013 Class: M. 'l‘ech. (I&C) Ist Sem. 2013 Batch, Paper IE-8101 Instrumentation System Design ’ MM: 30 Teacher Name: Umesh Ratltore, RS EIE Nola: /tllcmpl all que. rIion. r in xeclions A & I}. l . iii) v) L) 1.». Section A Answer the Following short answer type questions. / pressure gauge is calibrated from 0—l00 kN/ mi. It has a uniform scale with I00 scale divisions. One tenth ofa scale division can be read with certainty. The resolution ofthe gauge is at) 0.lkN/ nr’ b)0.0lkN/ ml c) 0.00lkN/ ml d)tkN/ ml A digital voltmeter has a read out range from 0 to 9999 counts. What will be the resolution in volts when full scale reading is 9.999‘? ' ’ at) lmV b) 2mV e) 0.lmV d) l0mV Write any three desirable & three undesirable characteristics ofan instrument. l)ilTerentiate between resolution & threshold l)ilTerent_iate b/ w accuracy & precision. (5*2=l0) Define the following tertns related to measuring instruments: at) Drilt h) llystercsis c) Sensitivity (l) Linearity c) Dead band (5*l= 5) Section B A current has a true value of 1.7 Amperes. An ummcter -vith 0-2A scale shows 1.66/. What will be the absolute error? Also calculate the relative error and relative error in terms of full scale division. Also comment on the result. (4) A voltmeter having an input impedance M25 k9 is used for measurement ofa voltage in a circuit having an output impedance of l500 Q and an open circuit voltage oF8 V at 10 V scale. Find the percentage error in the instrument. ' (4) With the help of block diagram, explain the function of various elements of a generalized measurement & instrunnmtation systctn. Also cite a suitable example indicating the various elements incited system (7) 3QVv£lS‘l€" v. 't. _‘cl. t ~'. >»_J ; ’[_. ;;t
  2. 2. l’Cnltc, E{ l’<§. ”.: Ji SLIET Longowal, Minor Examination-ll, November, 2013 Class: M. Tech. (l&C) lst Sem. 2013 Batch, Paper IE-8101 Instrumentation System Design ’ MM: 30 Date of Exam: 08-11-2013, Shift: 8.30AM-9.30AM Time: 1 Hour Subject Teacher: Umesli C. Rathore, Note: Atlempl all questions in sections A & B. Section A l. Answer the following short answer type questions specifically: Name any two biological sensitive materials used in bioscnsors. it) What is the process ofpoling in ferroclectric material? iii) Name arty two materials exhibiting piezoelectric property. ‘ A pressure gauge is calibrated from 0-200 kN/ m2. It has a uniform scale with 100 sealedivisions. One tenth ofa scale division can be read with certainty. Calculated resolution of the instrument. - ; ."a'tr! ‘~_ __~. L.ttr; ;:. _ 3 . :; V E; v) Differentiate’ between drifi & dead band. A; vi) Name one specific application of extrinsic type optical fibre sensor. i vii) Which instrument is best suited to measure very low pressure ofthe order of l0'” to 10" bar? viii) What is Curie temperature‘? How does it differ from Curie point? - ix) How temperature can be measured using optical fibre sensor? 5; x) Which material used as strain gauge has highest gauge factor? " xi) What is working difference between photocell and photo-transistor? xii) Name any two materials used as metallic strain gauge. xiii) Cite one example of inverse transducer. xiv) Name the most commonly used light sources in optical sensors. xv) What is Direct Digital Control (DDC)? i (l5*l'—'l5) Section B __§L; ,L' _ lJ Explain t. he working principle of Hall Effect based current sensor. (3) 3. Calculate the change in resistance produced by a l50um/ m strain in a metal gauge with Gl"=2.ll and also with the similar strain in a semiconductor gauge with GF= -I50. Nominal resistance of both metal and semiconductor is I200. Comment on the result. _ . (3) ‘V 4. What are biosensors? Mention the features, technologies and applications of bioscnsors. (3) l 5. Explain the various techniques oflight intensity modulation in optical fibre sensors. ‘ (3) 6. What are smart sensors? How do they differ from other types of sensors? Mention their features and ‘:3 application advantages. (3) ~ o -1 v llu"E°LtCQ€t. t¢tc°)'l>~‘* ~ “W” M -”"*"“ -1 3* ‘_‘. ~. »ct‘ : ’;-l‘i‘ '. .. ..-. , .41.-s~o~'-'. '-'37’? . t A 7771?? " . ' T t
  3. 3. ‘V V . ,, .., .» . r PCrrl u= . ha agar SLI ET Longowal, Major Examination. Class: M. Tech. (l&C) lst Sim. 2013 Batch, Paper IE-8101 lnstrumvntrion System Design Time: 3 Hours MM: 50 Subject Teacher: Umesh C. Rathore Date of Exam! 07-01-1014 Note: Attempt total five questions. Section A is compulsory. Attempt any two questions from Section-B and any two questions fiam Seetion—C. A II questions carry equal marks. Section A I. Answer the following short answer type questions briefly as asked: i) A pressure gauge is calibrated for 0-l00 kN/ ml scale. It has a uniform scale with 100 scale divisions. One tenth ofa scale division can be read with certainty. Calculated resolution of the instrument. ii) Differentiate between piezoelectric & piezoresistive effect. iii) Differentiate between accuracy & precision. iv) List down at-least three each desirable & un-desirable characteristics of an instrument v) Which instrument is best suited to measure very low pressure ofthe order of 10'” to I0" bar? vi) Differentiate between thennistor and RTD. vii) Define gauge factor in strain gauge. viii) Write down the composition and measurement range of ‘K’ type thennocouple. ix) What is inverse transducer? x) Give the specific applications of pyrometer. (l0*1=l0) SI tion B 2. i) With the help of block diagram, explain the function of various elements ofa generalized measurement & instrumentation system citing a suitable example inlicating the various elements in the system (7) ii) A current in an electrical circuit has a true value of 1.8 Amperes. An ammeter with 0-2A scale shows I . "./8A. What will be the absolute error? Also calculate the relative error and relative error in tenns of full scale division. (3) 3. i) What is Hall-Effect‘? Explain the working principle ofHall Effect based current sensor. (5) ii) Explain the basic working principle and types of optical fibre based sensors. Cite at-least two examples of optical fibre based measurement schemes for measuring physical parameters such as force/ pressure. (5) 4. What are biosensors? Mention the features, technologies and applications ofbiosensors. ([0) Section C 5. Explain the various techniques ofrotational velocity (speed) measurement using non-contact type sensors. (l0) 6. For an industrial process or part of an industrial process, design a suitable instrumentation scheme suggesting various types of sensing techniques for various zarameters involved in cited process after briefly defining the process. Give the properjustification oftypcs of selected instruments in the proposed scheme. (10) 7. Write a note on the following; i) In; 'rumcntation nmplificr ii) Smmi Sensors (5'). = t0) x I *4; an . -,. a . -want . '_m. *d u.1_. . '~: ;1:-1;: “‘; .:<. '-

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