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