B.TECH.
THEORY EXAMINATION (SEM–IV) 2016-17
SENSOR & INSTRUMENTATION
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Time: 3 Hours
Max. Marks : 100
Note: Be precise in your answer. In case of numerical problem assume data wherever not provided.
SECTION-A
- Explain the following: (10×2=20)
- Compare Transducer & Inverse Transducer with example.
- Draw characteristics for Thermocouple.
- Explain Peltier effect in thermocouple?
- Write OP-Amp Ideal characteristics.
- What is need of modulation?
- Explain different performance parameters of Digital to Analog converter.
- What is meant by high level and low level multiplexing? Explain the features of both processes.
- An 8 bit DAC has output voltage range 0-5V.find its resolution, accuracy
- Draw Sample & Hold circuit & explain its purpose in Instrumentation
- Explain different pressure sensor with examples.
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SECTION-B
- Attempt any five of the following: (10×5=50)
- Derive the Expression for Output voltage for an Active high pass filter, also find cutoff Frequency and draw its frequency response.
- Explain the working of Hall Effect Transducer.
- Explain the purpose of frequency division multiplexing in telemetry system with block diagram.
- Explain the Working of LCD and differentiate between light scattering and field effect types of LCD.
- A Strain Gauge having a Resistance of 120O gauge factor of 2 is connected in series with a ballast resistance of 120 O across a 12v supply. Calculate the difference between the output voltage (voltage across strain gauge) with no stress applied & with a stress of 140 MN/m² Modulus of elasticity of the member undergoing strain is 200GN/m²
- Describe the working of Different Digital to Analog Conversion techniques
- With the help of neat sketch explain different types of level meters also write its advantage & disadvantages.
- Classify different Transducer with example.
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SECTION-C
- Attempt any two of the following: (15×2=30)
- Write short note on Thermocouple, write temperature range of different material - wire use in it. Write its advantage & disadvantages.
- Derive expression for gauge factor of strain gauge „A resistance strain gauge with gauge factor 2 is fastened to steel subjected to stress 500 kg/sq. cm .if modulus of elasticity of steel is 2 *106 kg/cm²,calculate change in resistance if strain gauge element applied due to applied stress.
- Draw A Maxwell inductance bridge,it is use to measure inductance in comparison with capacitance the various value at balance are-Arm AD R2=300 O, BC R3=500 O, CD R4= 800 O, CD C4=0.5µ F find R1, L1 and storage factor at 1000Hz.
- What do you mean by interference, explain working of Interferometer use to detect the linear movement.
- Explain digital modulation - Pulse code modulation techniques.
- Write short notes on
- Radiation pyrometer
- McLeod gauge
- What is current telemetry system? Describe motion and force balance current telemetering systems with the help of neat sketches.
- Explain working principle of stroboscope used in textile industry.
- Explain different Nano sensors are used in environment.
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