JNTU B.Tech II Semester INSTRUMENTATION Examinations, Apr/May 2008

JNTU B.Tech II Semester INSTRUMENTATION Examinations, Apr/May 2008

(Electrical & Electronic Engineering)

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks


1. (a) Define ‘drift’, ‘threshold value’ and ‘dead-band’ of a measuring system and

give an example for each.

(b) Distinguish between ‘range’ and ‘span’ of an instrument. [8+8]


2. (a) Explain the spectra of a periodic rectangular pulse train for the following.

i) Amplitude

(ii) Phase spectra when time origin coincides with centre of pulse.

iii) Phase spectra with pulse starting at t=0.

(b) Define line spectra. [8+8]


3. Define deflection sensitivity and deflection factor of a cathode ray tube. [16]


4. On what basis digital voltmeters are classified and explain any two non-integrating

type digital voltmeters. [16]


5. (a) Mention a few applications of heterodyne wave analyzers.

(b) Explain the principle and operation of basic spectrum analyzer with a neat block diagram. [4+12]


6. Explain the operation of Control type synchro system. [16]


7. (a) Explain the operation of DC Tachometer generators. What are it’s advantages

and disadvantages.

(b) Explain Strobotran with a neat sketch. [8+8]


8. Write a short notes on the following:

(a) Electromagnetic flow meter

(b) Inductive method of liquid level measurement

(c) thermocouples. [6+5+5]

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