Dr.A.P.J.Abdul Kalam University BE LATERAL III SEM ALL BRANCH Measurements and Instrumentation (EC224T) Dec - 2020 Question Paper

Dr.A.P.J.Abdul Kalam University

Bachelor of Engineering

Third Semester Main Examination, Dec-2020

Measurements and Instrumentation (EC224T)

Time: 3:00 Hrs Max Marks 70

Note: 1. Attempt any five questions out of eight.

          2. Answer should be precise & to be point only.

          3. Assume suitable data if necessary & state them clearly.

Q.1 (a) Describe the working principal of chopper type D. C. Voltmeter. What are the advantages and disadvantages of chopper type. D. C. Voltmeter over basic D. C. Voltmeter.

(b) Explain the working principal of Bolometer.

Q.2 (a) What is electrostatic deflection ? What do you understand by post deflection acceleration?

(b) With the help of circuit diagram explain the working of Maxwell’s inductance and capacitance bridge.

Q.3 (a) Discuss the working principal of calorimeter.

(b) Discuss the following terms.

(i) Sensitivity (ii) Linearity (iii) Resolution

Q.4 (a) Describe the circuit and working of a Q-meter. Also describe the impedance measurement using Q-meter.

(b) List of various parts of CRO. Draw its block diagram and explain the working of all parts of CRO.

Q.5 (a) Explain the principal working of LVDT with the help of diagram.

(b)What is a thermistor? Describe with the help of neat sketches.

Q.6 (a) Draw the block diagram of function generator and explain the working of it.

(b)Explain square wave generator.

Q.7 (a) Describe the construction and working of photovoltaic cells. Draw their

characteristics. Name the different materials used for these cells. (b) Write short notes on.

(i) RVDT (ii) Optical Transducer.

Q.8 (a) Explain the working of beat frequency os collator.

(b) Explain the principal of working and application of sweep frequency generator.

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