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Posted Date: 05 Jul 2008 Posted By: Vidya Member Level: Diamond
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2007 Anna University B.Tech EC1255-MEASUREMENTS ANDINSTRUMENTAION Question paper
B.TECH DEGREE EXAMINATION MAY/JUNE 2007
Fourth Semester
Electronics and Communication Engineering
EC1255-MEASUREMENTS ANDINSTRUMENTAION
(Regulation 2004)
Time:3hrs Maximum:100marks
Answer ALL questions.
PART A -(10X2=20 marks)
1.What are the different types of standard of measurement?
2.What is a transfer instrument?
3.How is the electron beam focused to a fine spot on the face of the cathode ray tube?
4.List the disadvantages of storage cathode ray tube.
5.Give the functions of an attenuator in a signal generator.
6.What are the draw backs of tuned circuit analyzers?
7.What is the importance of gate time in frequency counter?
8.How is trigger time error reduced?
9.Distinguish between analog and digital data acquisition systems.
10.How much elapsed time would occur to a reflection from a break in an optical fibre of 1.4km if the index of refraction
of the core was 1.55?
PART B - (16X5=80 marks)
11.(a)(i)With a neat diagram explain in detail the construction of PMMC instrument.(8 )
(ii)How do you measure large currents in PMMC instruments?(4)
(iii)What is Ayrton shunt?(4)
Or
(b)(i)Discuss in detail about Kelvin double bridge.(8 )
(ii)With a neat diagram explain in detail about Hay bridge.(8 )
12.(a)With a neat diagram explain in detail about
(i)Ramp type DVM(8 )
(ii)Successive approximation DVM.(8 )
Or
(b)With a neat block diagram explain in detail about vector impedance meter.(16)
13.(a)With a neat block diagram explain in detail about the frequency divider typer of signal generator with
frequency modulation.(16)
Or
(b)Explain:
(i)General purpose spectrum analyzer.(8 )
(ii)Phase locked circuit for the first local oscillator of spectrum analyzer.(8 )
14.(a)(i)What method can be used to increase the frequency range of frequency counter.(8 )
(ii)How can this be achieved without degrading the accuracy of the counter.(8 )
Or
(b)Discuss in detail about
(i)Gating error
(ii)Time-base error and trigger level error.
(iii)Maximum accuracy achieved for frequency measurements.
15.(a)(i)What are the requirements of an automatic test system?
(ii)Explain in detail about IEEE 488 system.
Or
(b)With a neat block diagram explain
(i)Optical power meter
(ii)Auto ranging power meter
(iii)Optical time-domain reflectometer.
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