Osmania University (OU) 2006-1st Sem B.E Electronics & Tele-Communication Engineering 3/4 (E.C.E)(ESTER)SUPPLEMENTARY ,IL, Electronic measurements and instrumentation - Question Paper
B.E 3/4 (E.C.E)(I-SEMESTER)SUPPLEMENTARY EXAMINATION,APRIL,2006
Electronic measurements and instrumentation
StfSiH Code No.: 10297
FACtJI/fY Or ENG*NI&i<ING
9.E. IIJ/IV Year (ECE) I Semester (Supplementary) Examination, May 2006
ELECTRONIC MEASUREMENTS AND INSTRUMENTATION Time : 3 Hours] [Max. Marks : 75
Answer a3H questions of Part A.
- Artsuer five questions from P&et B.
! iNdft A - tMarks : 25)
1. A Voltmeter having a sensitivity of 1000Q/V reads 100V on its 150V scale when connected across an unknown resistor in series with milli ammeter calculate the error due to loading effect of voltmeter. 3
2. Match the Statements: 3
Ctixkijp A Group B
(a) Hotwire Hotfilm Anemometer (1) Measurement of humidity is used for
(b) Hygrometer is used for (ii) Measurement of liquid level
(c) Nucleonic Gauge is used for (iii) Measurement of Temperature
(iv) Measurement of fluid flow
(v) Measurement of pH value
3. Write the principle of ElectrOdynamicmicrophone. Mention its applications. 3
4. Explain Seebeck effect with reference to Thermocouple.
5. What is the main difference between the principle of operation of a wave analyser and spectrum analyser.
6. What is meant by 4Vz digit DVM? Find its resolution.
7. An electrically deflected CRT has a final anode Voltage of2000V and parallel deflecting plates 1. 2cm long and 5mm apart. If the screen is 50 cm from the centre of deflecting plates find Beam speed and deflection sensitivity of tube.
8. Show the NRZ recording of digital data for 11001011 data. 2
9. Compare the performance of different types of DVMs. 3
10. Explain the terms Action potential and resting potential.
, . ~ i S i ' Hi i
11. (a) Explain what do you understand by random errors. How do you reduce tne
effect of these errors in the neasureiMeiith 7
fb) Briefly give the classification of standards. ,.3
12. Draw the equivalent of Piezo Electric Transducer (PZT) and derive the expression for frequency response of PZJl Sfaaw that they axe not suitable for static measurements.
13. A parallel plate capacitive transducer has plates of600 mm2 area which are separated by air by a distance of 0.2mm. The resistance of the transducer is 20 x 1012.
f Calculate the time constant of the transducer and find the attenuation of the oUtput at lOOCMz. The pfetmittivtty ofair&8.85 x I0"12 F/M. 10
14. (a) With a neat Schematic, explain the construction and operation of condenser
type microphone. J n ; 4
(b) What is the use of Aluminium Oxide Hygrometers and feedback Pneumatic Load Cell. Explain their functioning. 6
15. The following sound pressure levels are measured for a machine working Textile industry operating in a noisy environment: 10
(a) SPL of machine and background noise = 90dB
(b) SPL of background nois = 80dB Determine the SPL of the machine alone.
16. Indicate tjie manifestation of the ECG signal on lead II and label all its component parts making the appropriate amplitudes and durations in a normal human subject. Explain what is happening electrically with in the heart during each wave or interval.
17. Write short notes on : m
(a) Temperature Measurement
(b) GPIB Interface and protocol.
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