GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (NEW) EXAMINATION — WINTER 2018
Subject Code: 2180912
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Subject Name: Condition Monitoring
Time: 02:30 PM TO 05:00 PM
Date: 15/11/2018
Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Write different maintenance strategies. 03
(b) Explain planned and preventive maintenance of transformer. 04
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(c) Explain transformer failure pattern and failure analysis. 07
Q.2 (a) What are the conditions for applying gas ratio method. 03
(b) Explain the fault in key gas method. 04
(c) Explain frequency response analysis method for power transformer. 07
OR
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(a) Explain tools and techniques of condition monitoring. 07
Q.3 (a) Explain time domain dielectric response methods. 03
(b) Explain Acoustic techniques. 04
(c) Explain frequency domain dielectric frequency response (DFR) method and also write advantages and disadvantages of DFR measurement in time and frequency domain. 07
OR
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(a) Explain need of monitoring. 03
(b) Explain interpretation of frequency response measurements in detail. 04
(c) Explain combined criteria for dissolved gas analysis. 07
Q.4 (a) Explain root causes and failure modes. 03
(b) Write construction of electrical machines. 04
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(c) Explain temperature measurement in details. 07
OR
(a) Write bearing faults and shaft voltages. 03
(b) Explain bulk measurement for temperature monitoring. 04
(c) Explain structure of electrical machines and their types 07
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Q.5 (a) Explain Hot — Spot measurement. 03
(b) Explain frequency spectrum monitoring. 04
(c) What are the factors that affect detection. 07
OR
(a) Explain sleeve bearing. 03
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(b) Explain fault that can be detected with motor current signature analysis. 04
(c) Write insulation degradation detection and explain particulate detection for chemical analysis. 07
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