Electrical Measurement and Measuring Instruments — Winter 2023

Define the following terms : (1) True value (2) Threshold (3) Sensitivity

Discuss different methods of measurement.

Explain in detail working principle and construction of LVDT.

Explain how strain gauges are used for the torque measurement.

Differentiate between statistical and random errors.

Define transducer and classify it.

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

How is the instrument range extended by Instrument Transformers?

Draw the circuit diagram of Anderson’s bridge

Explain working principle and construction of Piezoelectric transducer.

Explain working principle of Weston frequency meter.

State different methods used to measure low, medium and high resistance

Explain construction and working principle of 1-phase induction type energy meter.

Explain why CT secondary should not be open ?

Explain any one method for measurement of high resistance.

Explain working of Kelvin’s double bridge for measurement of low resistance with neat diagram

Explain the different principles of working of capacitive transducers.

Draw & explain the construction of PMMC instrument.

Describe the constructional detail of a moving iron instrument with the help of diagram. Derive the equation for defection if spring control is used

Discuss the loss of charge method for high resistance measurement.

Explain working principle of Hall effect transducer.

Draw & explain block diagram of Digital storage oscilloscope.

Write a brief note on Megger.

Explain the working principle of LCR meter.

Explain measurement of unknown capacitance with the help of Schering bridge. Also draw phasor diagram.