Download GTU BE/B.Tech 2018 Winter 3rd Sem New 2130903 Electrical Measurement And Measuring Instruments Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER-III (New) EXAMINATION - WINTER 2018

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Subject Code:2130903 Date:05/12/2018

Subject Name:Electrical Measurement and Measuring Instruments

Time:10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. (a) Define the following terms:
   1. Resolution
   2. Sensitivity

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   3. Threshold (03)
2. (b) Define error and classify it in detail. (04)
3. (c) Define transducer and explain transducer selection factors. (07)

Q.2

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1. (a) Explain advantages and limitations of Wheatstone’s bridge. (03)
2. (b) Derive the generalized equation for bridge balance condition of an a.c. bridge with necessary diagram. (04)
3. (c) Describe the principle and characteristics of LVDT with necessary diagram. (07)

   OR

   Write a technical note on : Hall effect transducer. (07)

Q.3

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1. (a) List advantages of digital voltmeter. (03)
2. (b) Compare analog and digital instruments. (04)
3. (c) Explain Maxwell’s bridge with necessary bridge balance equation and vector diagram. (07)

   OR

   Explain important features of a power-analyzer. (07)

Q.4

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1. (a) Write a technical note on : Electronic Multimeter. (03)
2. (b) Draw the circuit diagram of Kelvin’s double bridge used to measure low resistance. Also derive its bridge balance condition. (04)
3. (c) Define : i) Active transducer(ii) Passive transducer iii) Inverse transducer (07)

Q.5

1. (a) Explain piezoelectric transducer. (03)

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2. (b) Explain the construction and working of moving iron meter. Derive its torque equation. (04)

   OR

   Describe the use of multiplier in voltmeters. (07)
3. (c) Compare - Moving coil and Moving iron instruments. (07)

1. (a) Derive the equation for gauge factor of a resistive strain gauge in terms of Poisson’s ratio. (03)
2. (b) Why PMMC instruments cannot be used for a.c. measurements? (04)

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3. (c) Explain advantages and disadvantages of instrument transformers. (07)

1. (a) Define Telemetry. Explain with necessary block diagram the basic telemetry system. (03)

   OR

   Explain objective and requirements of recording data. (07)
2. (b) Explain principle of operation of basic strip chart recorder. (04)
3. (c) Explain the use of single wattmeter in measurement of 3-phase power. (07)

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