Electrical And Electronics Measuring Instruments — Summer 2019

Define and explain: (i) Precision (ii) Accuracy (iii) Sensitivity (iv) Resolution

Drift (vi) Repeatability (vii) Error.

Explain the voltage standards.

Describe the construction and working of PMMC instrument.

Differentiate between spring control and gravity control methods used to produce the controlling torque.

Explain construction working of D’Arsonval galvanometer. Also derive its torque equation.

Discuss the methods by which range of ammeter and voltmeter can be extended.

Give brief note on digital tachometer.

Sketch and explain the construction and working of attracted disc type Kelvin absolute electrometer.

Explain the various factors which are taken in to consideration while selecting an electronic type analog voltmeter.

Explain the electrodynamometer type wattmeter.

Draw the circuit diagram of a Crompton’s Potentiometer & explain its working. Describe the steps used when measuring an unknown resistance.

Differentiate AC and DC potentiometers.

Describe the constructional detail of single phase induction type energy meter.

Write a short note on Weston frequency meter.

Discuss the types of errors. Explain the causes of various types of errors.

Write a short note on single phase electrodynamometer type power factor meter.

Explain construction and working of a maximum demand indicator.