Instrumentation And Control Systems Rr

Set No. 1

Code No: RR220305

II B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007 INSTRUMENTATION AND CONTROL SYSTEMS ( Common to Mechanical Engineering, Production Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) What do you mean by instrumentation? Write the objectives of instrumentation. (b) State and explain the desirable static and dynamic characteristics of an instrument. [16] 2. (a) Explain operation of ionization transducer with a neat sketch and write the applications. (b) Describe the construction and principle of i. LVDT ii. Variable reluctance displacement transducer. 3. State the laws of thermocouples with a block diagram.

[16] [16]

4. (a) Define pressure. What is it due to? How is it different from stress? (b) Describe the construction of a U-tube manometer and explain how it can be used for measurement of absolute, gauge and differential pressures. [8+8] 5. (a) Certain meters are known as variable head meter. Explain clearly what is meant by the designation variable head. (b) Compare and contrast the use of venturimeter, flow nozzle and orifice meter as primary element for flow measurement. [16] 6. (a) Explain the working of piezoelectric accelerometer with neat sketch. (b) Name the two types of velocity transducers used for the measurement of vibration and explain any one type with neat sketch. [8+8] 7. (a) Draw a neat sketch and explain the working of unbonded resistance type strain gauge. (b) Give the applications of unbonded strain gauges. (c) List the drawbacks of bonded type strain gauges.

[8+4+4]

8. (a) Describe the operation of a driver driving an automobile on the road and Identify the components, input and output of the human system. (b) What is a servo mechanism? Explain. ⋆⋆⋆⋆⋆ 1 of 1

[10+6]

Set No. 2

Code No: RR220305

II B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007 INSTRUMENTATION AND CONTROL SYSTEMS ( Common to Mechanical Engineering, Production Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Write the classification of errors. (b) What is a transducer? State the factors on which transducer selection depends. (c) Distinguish between active and passive transducers with suitable examples. [4+8+4] 2. (a) Explain operation of ionization transducer with a neat sketch and write the applications. (b) Describe the construction and principle of i. LVDT ii. Variable reluctance displacement transducer.

[16]

3. (a) Differentiate between the thermo comples connected in series and parallel. (b) Distinguish between RTD and thermistors.

[16]

4. (a) Describe the working principle of pirani gauge. (b) Describe the method of measurement of differential pressure using an inductive transducer. [8+8] 5. (a) List out the advantages and limitations of direct method of level measurement. (b) Describe with neat sketch the functioning of any two types of displacer type liquid level measuring instruments. [16] 6. (a) Explain the calibration procedure for an accelerometer. (b) What are the different methods of converting vibration into a voltage? Explain any on in detail. [8+8] 7. (a) Draw a neat sketch and explain the working of unbonded resistance type strain gauge. (b) Give the applications of unbonded strain gauges. (c) List the drawbacks of bonded type strain gauges.

[8+4+4]

8. (a) Distinguish between open-loop and closed loop control systems with the help of a suitable diagram. (b) Illustrate your answer using block diagram schematics. 1 of 2

Set No. 2

Code No: RR220305

(c) Identify the system parameters and components in each case. ⋆⋆⋆⋆⋆

2 of 2

[16]

Set No. 3

Code No: RR220305

II B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007 INSTRUMENTATION AND CONTROL SYSTEMS ( Common to Mechanical Engineering, Production Engineering and Automobile Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆ 1. (a) Explain the following terms related to dynamic characteristics of an instrument. i. ii. iii. iv.

Speed of response and measuring lag. Fidelity and dynamic error. Dead time and dead zone. Step,ramp and linear input functions.

(b) Define the following terms as applied to the dynamic response of measurement systems subjected to sinusoidal input i. Frequency and circular frequency. ii. Undamped natural frequency ,damped natural frequency and resonant frequency. iii. Phase shift and time delay. [16] 2. (a) Give detailed classification of speed measuring devices with examples. (b) Write short note on Induction Sensors for speed measurement.

[8+8]

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) Distinguish between static pressure and stagnation pressure. (b) What are the Instruments used for measurement of low pressure and low vacuum pressure. (c) Explain with neat sketch the principle of working of Mc Leod Gauge.

[16]

5. Explain in detail with neat sketches (a) liquid level measurement using capacitive transducer. (b) Cryogenic fuel level indicator.

[8+8]

6. (a) Explain the principle of a hydrometer. (b) What is a vibrometer? Explain any one of them. 7. (a) Draw any four types of strain gauge arrangement for measuring strain. 1 of 2

[16]

Set No. 3

Code No: RR220305 (b) How resistive strain gauges are calibrated?

[8+8]

8. (a) Explain the operation of ordinary traffic signal. Why is the system called open loop? How can traffic be controlled more efficiently? (b) An ordinary floor furnace with manual control is an open loop control system. State the disadvantages of the open loop system. How may this be made an automatic closed loop system? Explain with the help of a block diagram.[16] ⋆⋆⋆⋆⋆

2 of 2

Set No. 4

Code No: RR220305

II B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007 INSTRUMENTATION AND CONTROL SYSTEMS ( Common to Mechanical Engineering, Production Engineering and Automobile Engineering) 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) Give the classification of inductive transducers indicating their principle. (b) Describe in detail the construction and working of an inductive and a capacitive transducers to measure linear displacement. [6+10] 3. What are different mechanical transducers used for temperature measurement? Explain any two types of them. [16] 4. (a) Differentiate between Atmospheric pressure and Gauge pressure and Vacuum. (b) With the aid of neat sketches, explain the principle of operation of various. [16] 5. Explain the principle of operations of (a) Hot wire anemometer. (b) Turbine meter for the measurement of Fluid velocity.

[16]

6. (a) Explain how a vibrometer is calibrated to measure acceleration. (b) How is measurement of vibrations on large structures done? Explain the method in detail. [8+8] 7. (a) Draw any four types of strain gauge arrangement for measuring strain. (b) How resistive strain gauges are calibrated?

[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] ⋆⋆⋆⋆⋆

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