Subject Code: 2162005
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER-VI(NEW) — EXAMINATION — SUMMER 2019
Subject Name: Electro Mechanical Measurements & Instruments
Time: 10:30 AM TO 01:00 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 static correction. [03]
(b) Differentiate between Reproducibility and Repeatability. [04]
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(c) Explain how the current and voltage range of PMMC type instruments extended with the help of shunts and multipliers and draw neat sketches. [07]
Q.2
(a) Define: Accuracy, Transducer and Seebeck Effect. [03]
(b) Compare Quarter bridge and Half bridge circuits for resistive strain gauges. [04]
(c) Classify the errors in measurement with its remedies. [07]
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OR
(c) Explain the “Fall of Potential” method for measurement of earth resistance with neat sketch. [07]
Q.3
(a) Define: (1) Hysteresis (2) Threshold (3) Sensitivity. [03]
(b) Explain the following terms with neat sketch. (1) Overshoot (2) Fidelity [04]
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(c) Differentiate between mechanical and electrical instruments. [07]
OR
Q.3
(a) Explain Drift with suitable examples. [03]
(b) Formulate the governing equation for a second order system with spring-mass and damping. [04]
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(c) Explain Seismic Transducer. [07]
Q.4
(a) What is Piezoelectric effect? [03]
(b) A strain gauge bridge consists of two-fixed 100 O resistor, one active gauge and one unstrained temperature compensating gauge connected in adjacent arms. The two gauge have an unstrained resistance of 100 O each and a G.F = 2.1.calculate the strain which would be represented by 80000 O calibration resistance. [04]
(c) Classify Telemetry system also explain current telemetering system and draw block diagram of general telemetry system. [07]
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OR
Q.4
(a) Define passive and active transducers with example. [03]
(b) Discuss any one application of D.C. potentiometer. [04]
(c) Discuss the advantages and disadvantages of LVDT/RVDT with its remedies. [07]
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Q.5
(a) Explain briefly Voltage-Current characteristic of thermistor. [03]
(b) Explain Electrical Tachometer. [04]
(c) Briefly explain zero, first and second order systems giving suitable examples and governing equations. [07]
OR
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Q.5
(a) What is load cell? [03]
(b) Explain mechanical tachometer with neat sketch. [04]
(c) Discuss the importance of A/D and D/A circuits in digital data acquisition system. [07]
Date: 16/05/2019
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Total Marks: 70
This download link is referred from the post: GTU BE 2019 Summer Question Papers || Gujarat Technological University
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