Set No. 1

Code No: RR421002

(b) Briefly explain Radio Telemetry system.

[8+8]

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1. (a) Explain wired Telemetry system and give its limitations.

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IV B.Tech II Semester Supplimentary Examinations, Apr/May 2009 TELEMETRY AND TELECONTROL ( Common to Electronics & Instrumentation Engineering and Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆

2. (a) With a neat sketch explain voltage telemetry system used to measure the liquid level.

(b) Explain the voltage Telemetry system to measure displacement by using LVDT sensor. [8+8]

or

3. Why is frequency telemetry considered superior to voltage or current telemetry even in short distance cases? Give the frequency ranges for the standard analogue signal of 4 to 20 mA range in frequency telemetry system. How can the analogue signal be converted in to frequency for transmission? [16]

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4. What does “Balun” stand for ? When is it used in communication systems? Give two examples with diagrams. [16] 5. (a) Draw the block diagram of digital to digital PCM telemetry and analog to analog PCM telemetry link. (b) Explain about De-commutator counters.

[8+8]

6. (a) Explain the fabrication and generation of Ruby Laser with figures and graphs. [8+8]

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(b) Draw the structure of a PIN diode and explain its features. 7. Write short notes on:

(a) DC double current transmission

(b) inductive pulse transmission.

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(c) Time-shared pulse transmission

(d) Direct modulation of h.f. Carriers by Tele control signals.

[4x4=16]

8. (a) Draw the sketch of short command equipment and explain. (b) With a neat sketch explain about the transmitter and receiver equipment used in remote signaling. [8+8] ⋆⋆⋆⋆⋆ 1 of 1

Set No. 2

Code No: RR421002

1. (a) Write the Telemetering milestones between 1812 to 1958.

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IV B.Tech II Semester Supplimentary Examinations, Apr/May 2009 TELEMETRY AND TELECONTROL ( Common to Electronics & Instrumentation Engineering and Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆

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(b) What is meant by Telemetry? Mention its future applications in Business, Communications, Industry, Military, Research and Transportation. [8+8] 2. (a) With a neat sketch explain the motion balance current telemetry system.

or

(b) Differentiate between motion balance and force balance current Telemetry system. [8+8] 3. Describe the torque balance telemetering system in details.

[16]

4. Explain why is it essential to use Radio frequency (R.F) telemetry .Describe it with some relevant examples. [16]

uW

5. Draw a neat circuit and explain PWM converter. Mention the different types of PWM multicoder. [16] 6. Define and explain the meaning of responsivity and quantum efficiency of photo diode and derive expressions for the same. [16] 7. Write short notes on :

(a) Water level telemetry (pulse interval method)

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(b) rotating transducers.

(c) Electronic Telemetry, (Pulse Phase Modulation)

(d) DC Compensation method.

[4x4=16]

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8. (a) Explain with a block diagram how remote supervision of several o/p stations is done using channel selector method. (b) Draw a sketch and explain about the Tele control installation working with cyclic address interrogation system. [8+8] ⋆⋆⋆⋆⋆

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Set No. 3

Code No: RR421002

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IV B.Tech II Semester Supplimentary Examinations, Apr/May 2009 TELEMETRY AND TELECONTROL ( Common to Electronics & Instrumentation Engineering and Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆

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1. (a) Define Telemetry and Tele control and explain how Telemetry encompasses disciplines of several fields.

(b) Give a brief account on the present day applications of Telemetry in Business, Communications, Industry, Military, Research, Transportation etc. [8+8] 2. (a) Distinguish between wired Telemetry and optical Telemetry.

or

(b) Mention the advantages and disadvantages of optical Telemetry over Radio Telemetry. [8+8] 3. Draw a block diagram of Radio Telemetry system and explain each block.

[16]

4. With the aid of block diagram explain time division multiplexing & de-multiplexing in FM-FM telemetry system. [16]

uW

5. What is meant by pulse code modulation? Explain basic elements of PCM system. Write about its advantages and applications. [16] 6. (a) Explain the historical development of optical fibres with the help of electromagnetic spectrum. (b) Draw a graph showing the refractive index distribution of central core cladded optical fibre and explain the plot. [8+8]

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7. Explain briefly analogue Tele control methods with time variable transmission signal. [16] 8. Define the following terms. (a) Quantizing

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(b) Redundancy

(c) Decision content

(d) Tele graphy speed (e) Hamming distance (f) Alphanumeric

(g) Channel capacity.

[3+2+2+2+2+2+3] ⋆⋆⋆⋆⋆ 1 of 1

Set No. 4

Code No: RR421002

in

IV B.Tech II Semester Supplimentary Examinations, Apr/May 2009 TELEMETRY AND TELECONTROL ( Common to Electronics & Instrumentation Engineering and Electronics & Control Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆⋆⋆⋆⋆

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1. (a) What is meant by signal conditioning and explain its role in the Telemetry system. (b) Differentiate between wired Telemetry and Radio telemetry system.

[8+8]

2. (a) With a neat sketch explain the motion balance current telemetry system.

or

(b) Differentiate between motion balance and force balance current Telemetry system. [8+8]

3. Sketch a complete frequency telemetry scheme including the details in the transmitting & receiving sides. What are the problems faced with the transmitting channel? [16] 4. (a) Distinguish between FM & AM.

uW

(b) Derive the formula for the instantaneous value of FM voltage and define the modulation index. [8+8] 5. Briefly explain about the sources of error in PWM Telemetry system.

[16]

6. Define and explain the meaning of responsivity and quantum efficiency of photo diode and derive expressions for the same. [16]

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7. Draw a neat sketch and explain each functional block of pulse telegram method (or) digital pulse duration in Tele control transmission. [16]

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8. List and briefly explain the environmental and interface conditions of Tele control apparatus. [16] ⋆⋆⋆⋆⋆

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