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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- III(OLD) EXAMINATION — SUMMER 2019
Date: 18/06/2019
Subject Name: Electrical And Electronics Measuring Instruments
Time: 02:30 PM TO 05:00 PM
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Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define and explain: (i) Precision (ii) Accuracy (iii) Sensitivity (iv) Resolution (v) Drift (vi) Repeatability (vii) Error. [07]
(b) Explain the voltage standards. [07]
Q.2 (a) Describe the construction and working of PMMC instrument. [07]
(b) Differentiate between spring control and gravity control methods used to produce the controlling torque. [07]
OR
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(b) Explain construction working of D’Arsonval galvanometer. Also derive its torque equation. [07]
Q.3 (a) Discuss the methods by which range of ammeter and voltmeter can be extended. [07]
(b) Give brief note on digital tachometer. [07]
OR
Q.3 (a) Sketch and explain the construction and working of attracted disc type Kelvin absolute electrometer. [07]
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(b) Explain the various factors which are taken in to consideration while selecting an electronic type analog voltmeter. [07]
Q.4 (a) Explain the electrodynamometer type wattmeter. [07]
(b) Draw the circuit diagram of a Crompton’s Potentiometer & explain its working. Describe the steps used when measuring an unknown resistance. [07]
OR
Q.4 (a) Differentiate AC and DC potentiometers. [07]
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(b) Describe the constructional detail of single phase induction type energy meter. [07]
Q.5 (a) Write a short note on Weston frequency meter. [07]
(b) Discuss the types of errors. Explain the causes of various types of errors. [07]
OR
Q.5 (a) Write a short note on single phase electrodynamometer type power factor meter. [07]
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(b) Explain construction and working of a maximum demand indicator. [07]
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