Electrical Measurement and Measuring Instruments — Winter 2018

Resolution, ii) Sensitivity, iii) Threshold

Define transducer and explain transducer selection factors.

Define error and classify it in detail.

Define the following terms:

Write a technical note on : Hall effect transducer.

Derive the generalized equation for bridge balance condition of an a.c. bridge with necessary diagram.

Describe the principle and characteristics of LVDT with necessary diagram.

Explain advantages and limitations of Wheatstone’s bridge.

Draw the circuit diagram of Kelvin’s double bridge used to measure low resistance. Also derive its bridge balance condition.

List advantages of digital voltmeter.

Compare analog and digital instruments.

Explain Maxwell’s bridge with necessary bridge balance equation and vector diagram.

Explain important features of a power analyzer.

Write a technical note on : Electronic Multimeter.

Define : i) Active transducer ii) Passive transducer iii) Inverse transducer

Explain piezoelectric transducer.

Explain the construction and working of moving iron meter. Derive its torque equation.

Describe the use of multiplier in voltmeters.

Compare Moving coil and Moving iron instruments.

Derive the equation for gauge factor of a resistive strain gauge in terms of Poisson’s ratio.

Why PMMC instruments cannot be used for a.c. measurements?

Explain advantages and disadvantages of instrument transformers.

Define Telemetry. Explain with necessary block diagram the basic telemetry system.

Explain objective and requirements of recording data.

Explain principle of operation of basic strip chart recorder.

Explain the use of single wattmeter in measurement of 3-phase power.