GTU Electrical And Electronics Measuring Instruments - June 2014 Exam Question Paper

GTU Electrical and Electronic Engineering (Semester 7)
Electrical And Electronics Measuring Instruments
June 2014

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) What is measurement standard? List out different types of standard. Explain voltage standard in brief.

7 M

1 (b) Define: (1) Accuracy (2) Precision (3) Resolution (4) Sensitivity (5) Threshold (6) Drift (7) Reproducibility.

7 M

2 (a) Describe the various operating torque needed for proper operation of an analog indicating instrument. Draw the neat sketch & explain in detail of eddy current damping torque in analog instrument.

7 M

Answer any two question from Q2 (b) or Q2 (c)

2 (b) Explain the construction and working of an electrodynamometer type of wattmeter.

7 M

2 (c) A resistance of approximate value of 80 ohm is to be measured by voltmeter-ammeter method using a 1 An ammeter having resistance of 2 ohm and 50 V voltmeter having a resistance of 5000 ohm. (a) Suggest which two method should be used? (b) Supposing in the suggested method I=0.42A and V=35.5v what is the resulting error if the accuracy of the instrument is 0.5% at full scale and the error are standard deviations.

7 M

Answer any two question from Q3 (a), (b) or Q3 (c), (d)

3 (a) Describe the working of Hay's bridge for the measurement of inductance. Derive the condition for balance and draw the phasor diagram

7 M

3 (b) State different method for the measurement of unknown capacitance.

7 M

3 (c) Explains the PMMC Type Ammeter With Torque Equation.

7 M

3 (d) Explains the electrodynamometer type low power factor wattmeter.

7 M

Answer any two question from Q4 (a), (b) or Q4 (c), (d)

4 (a) Draw the phasor diagram & derive the expression for deflecting torque & braking torque in single phase induction type energy meter.

7 M

4 (b) Explain Maxwell's bridge for measurement of unknown inductance. Also determine condition for balance with phasor diagram.

7 M

4 (c) Derive expression for unknown resistance in case of Kelvin's double bridge.

7 M

4 (d) Describe the working of Hay's bridge for the measurement of inductance. Derive the condition for balance and draw the phasor diagram.

7 M

Answer any two question from Q5 (a), (b) or Q5 (c), (d)

5 (a) Describe with the help of neat diagram the loss of charge method to determine the insulation resistance of a short length of cable and derive an expression for determination of insulation resistance.

7 M

5 (b) Explain construction and working of potential transformer. Also explain ratio and phase angle error.

7 M

5 (c) Explain with the help of neat diagram the working of a digital voltmeter.

7 M

5 (d) Explain with the help of a block diagram the working of a spectrum analyzer? Where is spectrum analyzers commonly used?

7 M

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