Rr321404-instrumentation-and-control-systems

Set No. 1

Code No: RR321404

III B.Tech Supplimentary Examinations, Aug/Sep 2008 INSTRUMENTATION AND CONTROL SYSTEMS (Mechatronics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Discuss briefly on the reliability of measurement systems. Explain how reliability improvement can be achieved. (b) “A pricise instrument need not be accurate” explain.

[8+8]

2. (a) Describe the different methods used for measurement of speed; describe their advantages and disadvantages. (b) Explain the construction, working and theory of a drag cup type tachogenerator. [16] 3. (a) Differentiate between the thermo comples connected in series and parallel. (b) Distinguish between RTD and thermistors.

[16]

4. Describe with diagrams, the construction, working and theory of following types. (a) Thermocouple gauges (b) Pirani gauges. Give their advantages and disadvantages. [16] 5. Enumerate the principle of operation of the following (a) capacitative level indicator. (b) ultrasonic level measuring instrument.

[8+8]

6. (a) What are the advantages of piezoelectric type accelerometer? (b) Name the different vibration sensing systems used in practice. Explain any one such system for the measurement of vibration. [8+8] 7. (a) Name the different types of strain gauges used in practice and explain how the selection of a strain gauge affect the measurement of strain. (b) How resistive strain gauges are calibrated?

[8+8]

8. Write short notes on the following: (a) Servomechanism (b) Temperature control system (c) Position control system

[16] ⋆⋆⋆⋆⋆ 1 of 1

Set No. 2

Code No: RR321404

III B.Tech Supplimentary Examinations, Aug/Sep 2008 INSTRUMENTATION AND CONTROL SYSTEMS (Mechatronics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Discuss briefly on the reliability of measurement systems. Explain how reliability improvement can be achieved. (b) “A pricise instrument need not be accurate” explain.

[8+8]

2. Describe the method of measuring speed using (a) Capacitor type Impulse Tachometer.

[16]

(b) Tachometers. 3. What are the types of pyrometers? Explain any one of them in detail with a neat diagram. [16] 4. (a) What is a differential pressure cell? (b) Elucidate the basic principle of operation of Mclead vacuum gauge with necessary diagram. (c) List the limitations of a Mclead vacuum gauge used to measure pressure. [4+8+4] 5. Enumerate the principle of operation of the following (a) capacitative level indicator. (b) ultrasonic level measuring instrument.

[8+8]

6. (a) Explain the general theory of seismic instruments used for vibration/accelerator measurement. (b) Explain the working of a bonded strain gauge accelerometer with neat sketch. [8+8] 7. (a) Explain the factors affecting the strain measurement. (b) Explain the working of servo accelerometer with neat sketch.

[8+8]

8. (a) Briefly explain the different types of control systems. (b) Describe the working of one automatic control system used in practice, outline functional elements of that system. [8+8] ⋆⋆⋆⋆⋆

1 of 1

Set No. 3

Code No: RR321404

III B.Tech Supplimentary Examinations, Aug/Sep 2008 INSTRUMENTATION AND CONTROL SYSTEMS (Mechatronics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What are the different standard inputs for studying the dynamic response of a system. Define and sketch them. (b) A thermometer has a time constant of 3.44. It is quickly taken from a temperature 00 C to a water bath having a temperature 1000 C. what temperature will be indicated after 1.55? [16] 2. (a) Describe the different methods used for measurement of speed; describe their advantages and disadvantages. (b) Explain the construction, working and theory of a drag cup type tachogenerator. [16] 3. (a) List all industrial thermocouples giving their elements and temperature ranges. (b) Why cold junction compensation is required? Explain an automatic cold junction compensation method. [8+8] 4. (a) Describe different sources of errors in U-tube manometer and how corrections can be applied to minimize these errors. (b) Explain how sensitivity can be increased by using inclined tube manometer. Describe its construction, advantages and limitations. [8+8] 5. (a) Explain the functioning of ultrasonic flow meter with a neat diagram. (b) With a neat diagram, explain the working of turbine flow meter and point out its limitations. [6+10] 6. (a) How seismic instruments are used for measuring acceleration. Explain in detail. (b) What is the importance of humidity control in process industries?

[8+4]

7. (a) Mention the important requirements for a strain gauge material. Name some of the materials used for making strain gauges. (b) How resistive strain gauges are calibrated?

[8+8]

8. (a) Describe the working of a system which automatically turns off the street lamps at dawn and turns on at dusk. Draw a schematic diagram of the system. (b) Draw the functional diagram of thermostat controlled home heating system and identify the system parameters and components. Describe the working of the system. [16] 1 of 2

Set No. 3

Code No: RR321404 ⋆⋆⋆⋆⋆

2 of 2

Set No. 4

Code No: RR321404

III B.Tech Supplimentary Examinations, Aug/Sep 2008 INSTRUMENTATION AND CONTROL SYSTEMS (Mechatronics) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Discuss briefly on the reliability of measurement systems. Explain how reliability improvement can be achieved. (b) “A pricise instrument need not be accurate” explain.

[8+8]

2. (a) Describe the methods of measurement of speed using i. Resonance tachometer ii. Centrifugal force tachometers. (b) Explain working of magnetic pick-up.

[10+6]

3. (a) Explain the principle behind the temperature measurement by radiation methods. (b) Explain the working of a total radiation in pyrometer.

[16]

4. (a) Differentiate between pirani-gauge and thermo-couple type conductivity gauge. (b) Discuss the merits and demerits of the following pressure sensing elements i. Capsule ii. Bourdon tube iii. Bellows [16] 5. With neat sketches explain in detail the functioning of any two flow measuring instruments working on Faraday’s law of induced voltage. [16] 6. (a) How seismic instruments are used for measuring acceleration. Explain in detail. (b) What is the importance of humidity control in process industries?

[8+4]

7. (a) Draw any four types of strain gauge arrangement for measuring strain. (b) How resistive strain gauges are calibrated?

[8+8]

8. Write short notes on the following: (a) Servomechanism (b) Temperature control system (c) Position control system

[16] ⋆⋆⋆⋆⋆ 1 of 1