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# Instrumentation and control systems Jntu Model Paper{Www.Studentyogi.Com}

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### Instrumentation and control systems Jntu Model Paper{Www.Studentyogi.Com}

1. 1. www.studentyogi.com www.studentyogi.com Code No: R05312001 Set No. 1 III B.Tech I Semester Regular Examinations, November 2007 INSTRUMENTATION AND CONTROL SYSTEMS (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks 1. (a) Explain the terms with respect to measurement systems: i. Static sensitivity ii. Linearity iii. Hysterisis (b) Discuss the response to rst order instruments to sinusoidal input. [9+7] 2. (a) Di erentiate between rare metal thermocouples and base metal thermo cou- ples. (b) Design a measurement system for displacement measurement using LDR (Light dependent resistor) as sensor. [6+10] 3. (a) Explain the measurement of pressure using U-tube manometer. (b) Discuss the constructional features of Bourdon-tube pressure guage. [8+8] 4. (a) What is Hot Wire Anemometer? Describe its construction and principle of Working. (b) With neat diagram, explain the working of turbine ow meter and point out its limitations. [8+8] 5. (a) What is the working principle of a stroboscope? (b) Compare the working of a servo and digital accelerometers. [4+12] 6. (a) What is a bonded strain gauge? (b) List the main advantages and limitations of semiconductor strain gauges. (c) Explain one method of temperature compensation using an adjacent arm com- pensating gauge. [2+6+8] 7. (a) Why humidity is to be measured? (b) De ne the Psychometric terms. i. Dry air ii. Moist air iii. Saturated air iv. Absolute humidity v. Relative humidity
2. 2. www.studentyogi.com www.studentyogi.com Code No: R05312001 Set No. 1 vii. Wet bulb temperature [2+14] 8. (a) Describe with neat sketch the open loop speed control system. (b) Illustrate with example, explain Closed loop temperature control system. [8+8]
3. 3. www.studentyogi.com www.studentyogi.com Code No: R05312001 Set No. 2 III B.Tech I Semester Regular Examinations, November 2007 INSTRUMENTATION AND CONTROL SYSTEMS (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks 1. (a) By means of at least two examples explain terms. i. Desired inputs ii. modifying inputs iii. interfering inputs iv. output (b) How are the e ects of modifying inputs and interfering inputs eliminated by method of opposing inputs. Explain by means of an example. [8+8] 2. (a) Explain by means of neat sketches, the use of helical potentiometers for dis- placement measurement. (b) Explain by means of neat sketches, the working principle of pressure ther- mometers. [6+10] 3. (a) How do you measure the pressure with the help of U-tube manometer and Micro manometer. (b) Explain the working principle of Pirani thermal conductivity gaguge [8+8] 4. Show that there exists a linear relation ship between the volume ow rate and displacement of oat in the case of a rotameter .Prove that if the density of the oat material is made twice that of owing uid, the volume ow rate becomes independent of the density of the owing uid and compression is almost complete for all ows. [16] 5. (a) Describe the working principle of D.C.Tachometer generator and what are its advantages and disadvantages. (b) What are the advantages and disadvantages of centrifugal speed tachometer? [12+4] 6. (a) If a strain gauge has a low gauge factor, what do es it indicate. (b) Name the various types of strain gauges for di erent applications. (c) Distinguish between bonded and unbonded type of resistance strain gauge. [3+3+10] 7. (a) Explain brie y how a stroboscopic is used to measure torque. (b) Explain the method of measuring force using a pneumatic load cell. [8+8]
4. 4. www.studentyogi.com www.studentyogi.com Code No: R05312001 Set No. 2 8. (a) With suitable examples, bring out the advantages of closed loop system over open loop system. (b) Draw a block diagram of the closed loop system considered above. Also explain why negative feed back is invariably preferred in such systems. [8+8]
5. 5. www.studentyogi.com www.studentyogi.com Code No: R05312001 Set No. 3 III B.Tech I Semester Regular Examinations, November 2007 INSTRUMENTATION AND CONTROL SYSTEMS (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks 1. (a) By means of at least two examples explain terms. i. Desired inputs ii. modifying inputs iii. interfering inputs iv. output (b) How are the e ects of modifying inputs and interfering inputs eliminated by method of opposing inputs. Explain by means of an example. [8+8] 2. (a) Di erentiate between rare metal thermocouples and base metal thermo cou- ples. (b) Design a measurement system for displacement measurement using LDR (Light dependent resistor) as sensor. [6+10] 3. (a) With the aid of neat sketch, explain the working principle of dead weight type Tester. (b) Derive an equation for the di erential pressure based on the movement of the liquid in the inclined column only. [8+8] 4. What are the di erent direct methods available for the measurement of liquid level. Explain any two of them. [16] 5. (a) De ne vibration. How is it characterized and list some of its harmful e ects. (b) Explain the calibration procedure for an accelerometer. [6+10] 6. (a) Explain the method of measuring force using strain gauges. (b) What are the requirements of a strain gauge. (c) Mention di erent technique available for the measurement of strain. [8+4+4] 7. (a) With neat sketch explain the working principle of Mechanical humidity sensing absorption hygrometer. (b) sketch and explain the constructional details and working of a dew point meter. [8+8] 8. (a) Sketch and explain position control using servo motor. (b) Sketch and explain open loop and closed loop temperature control system with block diagrams.
6. 6. www.studentyogi.com www.studentyogi.com Code No: R05312001 Set No. 3 (c) Brie y explain about positive feedback and negative feed back. [6+6+4]
7. 7. www.studentyogi.com www.studentyogi.com Code No: R05312001 Set No. 4 III B.Tech I Semester Regular Examinations, November 2007 INSTRUMENTATION AND CONTROL SYSTEMS (Production Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks 1. (a) Classify measuring instruments. (b) What are desired, modifying and interfering inputs for a measurement system? Give examples for each of these quantities. What is the in uence of these on the nal output? [6+10] 2. (a) Explain various methods used for reference junction compensation in thermo- couples. (b) Explain the construction and working of a thermometer to measure tempera- tures above 7000C. [8+8] 3. (a) Discuss various types of elastic pressure sensing elements used in electrical Transducers. (b) Describe the application, advantages and limitations of elastic diaphragm gauges. [10+6] 4. (a) Explain the principle of operation of a Rotameter. What are its limitations? (b) Discuss the types of ow meters. [8+8] 5. (a) A centrifugal tachometer having range 25-300, 250-3000, and 2500-30000 rpm is to used to measure the speed of a shaft which is believed to be in the vicinity of 3000 rpm. What range setting should be tried and why? (b) List any three mechanical tachometers used for measuring angular velocity and brie y explain them with suitable diagrams. [4+12] 6. (a) List a few bonding adhesives used for bonding strain gauges to the test surface. (b) Name the various types of strain gauges for di erent applications. (c) An electric resistance strain gauge of 100 resistance and gauge factor 2 is bonded to a specimen of steel. Calculate the change in resistance of the gauge when a tensile stress of 60MN/ 2 is applied on the specimen. [4+6+6] 7. (a) Explain with a diagram a pendulum scale of multi lever type. (b) Explain the method of measuring of force using a pneumatic load cell. [8+8] 8. (a) What is a servo mechanism? Explain (b) Describe the operation of a driver driving an automobile on the road and identity the components, input and output of the human system. [8+8]