Electronic Instruments and Measurements - May 2013

Electronics & Telecomm. (Semester 3)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

Solve any four questions :-

1 (a) Write a note on thermocouples,explain thermoelectric laws(5 marks) 1 (b) Explain the function of time base generator in a CRO(5 marks) 1 (f) Explain PCM telemetry system (5 marks) 1 (c) State important specifications of spectrum analyzer(5 marks) 1 (d) Explain true RMS meter (5 marks) 1 (e) What are data loggers (5 marks) 2 (a) Compare following temperature transducers with respect to their characteristics, measurement range ,applications RTD,thermocouple and thermostats(10 marks) 2 (b) Give specifications and applications of CRO and DSO(10 marks) 3 (a) Explain the elements of a digital FFT analyser with a suitable block diagram.(10 marks) 3 (b) Digital frequency counter used for ratio measurement for frequencies such as f1=1MHz and f2=200KHz.Calculate %error in meaurement.Suggest suitable solution for improving accuracy of measurement by 10 times.(10 marks) 4 (a) Draw a typical data acquisition system and explain function of each block (10 marks) 4 (b) What is the need of modulation in data transmission ?Explain with waveforms the various digital modulation techniques.(10 marks) 5 (a) Explain the principle of operation of dual slope DVM.(10 marks) 5 (b) How is the electron beam focused to a fine spot on the face of CRT(10 marks) 6 (a) Explain the need of data transmission and telemetry. What are the different modulation methods used in RF telemetry systems?(10 marks) 6 (b) Explain universal counter with neat block diagrams .Explain The applications of universal counter(10 marks) 7 (a) Significance of 3-1/2 and 4-1/2 digit in DVM(7 marks) 7 (b) True RMS meter (7 marks) 7 (d) Telemetry(7 marks) 7 (c) Strain gauges(7 marks) 7 (e) Automation in Digital Instruments.(7 marks)