Electrical Measurement and Measuring Instruments — Winter 2025

List types of systematic error. Explain the measures taken to minimize these errors.

Describe use of instrument transformers in the extension of range of measuring instruments.

Explain in detail working principle and construction of LVDT. Explain how the magnitude and direction of the displacement of core of LVDT can be detected.

Why PMMC instrument cannot be used for ac measurement ?

Explain any one method for measurement of high resistance.

Explain seebeck effect. Describe construction of thermocouple in detail with different materials used for the same.

Explain construction and working principle of electrodynamometer type wattmeter.

Define sensor, transducer & actuator.

A 250 : 5, CT is used along with an ammeter. If ammeter reading is 3.6 Amp, find out the line current.

Explain working principle and construction of Piezoelectric transducer.

Describe the working and construction of resistance thermometers with different materials used for the same. Draw the resistance versus temperature characteristic.

Explain why CT secondary should not be kept open ?

Define the following terms : (1) True value (2) Threshold (3) Sensitivity (4) Zero drift (5) Reproducibility (6) Accuracy (7) Fidelity

Draw & explain construction of PMMC instrument.

Explain working principle of Hall effect transducer.

Explain Maxwell’s bridge with necessary diagram. Write its advantages, disadvantages. Draw phasor diagram.1

Describe various controls of power scope.

Draw circuit of Owen’s bridge. Write its applications

Draw circuit of Kelvin’s double bridge method used for measurement of low resistance. Derive the condition for balance.

Write a brief note on Megger.

Compare Analog & digital multimeter.

Explain construction and working of Q - meter.

Explain the working principle of LCR meter.

Discuss the loss of charge method for high resistance measurement.

Draw & explain block diagram of Digital storage oscilloscope.