GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VI (NEW) EXAMINATION - WINTER 2018
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Subject Code:2162005
Subject Name:Electro Mechanical Measurements & Instruments
Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain the significance of “Signal Conditioning” in measurement system with suitable example. MARKS 03
(b) Differentiate between (i) Threshold and Resolution (ii) Repeatability and Reproducibility with suitable examples. 04
(c) Classify the transducers with suitable examples and neat sketches. 07
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Q.2 (a) Explain the “Systematic Errors” in measurement with suitable examples. 03
(b) Derive the second order system expression with suitable example and neat sketch. 04
(c) Discuss the AC and DC errors encountered in moving iron instruments along with its remedies. 07
OR
(c) Discuss the various standards in measurement in detail. 07
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Q.3 (a) What is “Thermopile” and discuss its advantages over thermocouple in measurement. 03
(b) Justify that Wheatstone bridge is not suitable for measurement of low and high resistance. 04
(c) List the various techniques for measuring vibrations and elaborate any one in detail. 07
OR
Q.3 (a) Explain why calibration is required for secondary standard instruments with suitable example. 03
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(b) Discuss “Rope-Brake Dynamometer” for measuring shaft torque. 04
(c) Explain the basic construction, working principle and operation of RTD. 07
Q.4 (a) Explain “Tertiary measurements” with suitable example. 03
(b) Explain how DC potentiometer is employed for calibrating DC voltmeter with neat diagram. 04
(c) With the help of suitable diagram explain that how differential arrangement of capacitive transducer gives the linear response. 07
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OR
Q.4 (a) Compare the electrical instruments with mechanical instruments. 03
(b) With schematic diagram explain optical torsion meter. 04
(c) Derive the output voltage expression of full bridge (Wheatstone Bridge) circuit for strain measurement and give its advantages over half and quarter bridge circuits. 07
Date:27/11/2018
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Total Marks: 70
Q.5 (a) Explain that how the range of PMMC instruments can be extended as an ammeter with suitable diagram. 04
(c) Discuss the operation of “Proving Ring” type load cell in detail. 07
OR
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Q.5 (a) Compare between Wire and Foil type strain gauges for measuring strain. 03
(b) Describe the working of “Piezoelectric Accelerometer”. 04
(c) Draw the functional block diagram of digital data acquisition system and explain the roll of each block. 07
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