Electrical Measurement and Measuring Instruments — Summer 2022

What do you understand by static and dynamic characteristics of a measuring instrument ?

Define the following terms : (1) True value (2) Threshold (3) Sensitivity (4) Zero drift

Explain in detail working principle and construction of LVDT.

Differentiate between statistical and random errors.

Acapacitive transducer with its plate separation of 0.05mm under static conditions has a capacitance of 5 X 10-12 F. Determine axial displacement, which causes change of capacitance of 0.75 X 10-12 F.

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

Define Gauge factor. Derive its expression.

Define sensor, transducer & actuator.

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

Explain working principle and construction of Piezoelectric transducer.

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

Explain why CT secondary should not be open ?

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

Draw & explain construction of PMMC instrument.

Explain working principle of Hall effect transducer.

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

Explain various controls of power scope.

Draw circuit of Owen’s bridge. Write its applications

Draw & explain block diagram of Digital storage oscilloscope.

Write a brief note on Megger.

Compare Analog & digital multimeter.

Explain construction and working of Q - meter.1

What is clamp on meter ? Write its applications.

Discuss the loss of charge method for high resistance measurement.

Explain Maxwell’s inductance capacitance bridge with connection diagram and phasor diagram also state balance condition for the same.