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Posted By: Sree.... Member Level: Diamond Posted Date: 14 Mar 2008
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2007 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech CALIBRATION AND ELECTRONIC MEASUREMENTS(R05) Set No. 1 Question paper
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Code No: R05221001 Set No. 1
II B.Tech II Semester Regular Examinations, Apr/May 2007
CALIBRATION AND ELECTRONIC MEASUREMENTS
(Electronics & Instrumentation Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. In a test temperature is measured 100 times with variations in apparatus and
procedures. After applying the corrections, the results are: [16]
Temeperature0C 397 398 399 400 401 402 403 404 405
Frequency of occurence 1 3 12 23 37 16 4 2 2
Calculate:
(a) the arithmetic mean
(b) the deviation from the mean
(c) Standard deviation
(d) Variance
(e) Probable error of one reading
(f) Probable error of mean
(g) Standard deviation of the mean
(h) Standard deviation of standard deviation
2. (a) Explain the concept of voltage standards?
(b) How can time and frequency standards be disseminated? [8+8]
3. Write short notes on any of the THREE:
(a) Testing
(b) Calibration
(c) Reliability
(d) Traceability [16]
4. (a) Write short notes on the principle of peak reading voltmeter?
(b) Illustrate the principle and working of ramp type DVM? Compare its perfor-
mance with other types of DVM’s? [8+8]
5. (a) What causes problems for bridges at radio frequencies? [6]
(b) Mention the applications of Wien bridge. [4]
(c) Point out the sources of errors in Q meter. [6]
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Code No: R05221001 Set No. 1
6. (a) With the help of a block diagram explain the multiplexed display technique
used in a frequency counter. [4+6]
(b) Explain in detail about frequency mode errors and period mode errors. [6]
7. (a) Derive an expression for the deflection sensitivity of electrostatic CRT. [10]
(b) The Lissajous pattern on an CRO is stationary and has 6 horizontal and 3
vertical tangencies. The frequency of the vertical input is 600Hz. Determine
the frequency of horizontal input. [6]
8. (a) Draw the block diagram of a logic analyzer and explain its operation. [2+6]
(b) Explain the different applications of spectrum analyzer. [8]
? ? ? ? ?
2 of 2
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