CLASS: B.Sc. ELECTRONICS
15A/ 125
St. JOSEPH’S COLLEGE (AUTONOMOUS) TIRUCHIRAPPALLI – 620 002
SEMESTER EXAMINATIONS – APRIL 2015
TIME: 3 Hrs.
MAXIMUM MARKS: 100
SEM
SET
PAPER CODE
TITLE OF THE PAPER
VI
2012
11UEL630214
SENSORS, TRANSDUCERS AND
MEASUREMENT
SECTION – A
Answer all the questions:
20 x 1 = 20
Choose the correct answer:
1. In present day measurement systems uses ______.
a) direct methods
b) direct methods is limited but indirect methods
c) both direct and indirect method
d) all of the above
2. A transducer converts _______
a) mechanical energy into electrical energy
b) mechanical displacement into electrical signal
c) one form of energy into another form of energy
d) electrical energy into mechanical form
3. A null type instrument has _______ in compared to a deflection
type instrument.
a) a higher accuracy
b) a lower sensitivity
c) a faster response
d) all of the above
4. The active transducer in the measurement of pressure is _______.
a) piezoelectric transducer
b) capacitive transducer
c) strain gauge
d) inductive transducer
5. Loud speaker is also used in the recorder of
a) EMG
b) ECG
c) EOG
d) EEG
Fill in the blanks:
6.
Accuracy refers to the degree of _______ to the true value of the
quantity under measurement.
7.
The mechanical elements that convert force into displacement is
called as _______ device.
8.
The piezoelectric transducer is used to measure _______.
9.
Common source of energy for pacemaker is the _______ battery.
10. _______ is an electrical pulse generator for starting and / or
maintaining the normal heart beat.
Match the following:
11. Rectifier instrument
- a) Gas velocities
12. clamp-on ammeter
- b) high ac current
13. Pirani gauge
- c) Acceleration
14. Hot wire anemometer
- d) RMS value
15. Piezo – electrical quartz - e) Very low pressure
State True or False:
16. An inverse transducer converts mechanical energy into electrical
energy.
17. To reduce common mode interference during recording of bio
signals one can use Chopper amplifier.
18. The gross errors are mainly made by instrument.
19. The decibel is a measure of power level.
20. Pre amplifier isolation in ECG circuit is to Increase output
impedance.
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Differentiate between the sensor and transducer.
OR
b. Explain the following terms (i) accuracy and precision.
22. a. Explain the classification of transducer.
OR
b. What is the need of measurement? List the two basic
requirements.
23. a. Describe the working of Pirani gauge with suitable diagram.
OR
b. How to measure pressure using electrical transducer as
secondary transducer?
24. a. Write short notes on different types of electronics instruments.
OR
b. Explain the universal shunt type ammeter with relevant
illustration.
25. a. Briefly mention the uses of ECG.
OR
b. What do you mean by CT? Give the mathematical details
obtaining X-ray image in CT.
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. Describe the function of Mechanical, thermal and electrical
dynamic models of sensor.
27. Explain the construction and principle of working of LVDT with
block diagram.
28. Explain the construction, working and theory of techogenerator
with neat diagram.
29. Write a short notes on (i) The Transistor voltmeter
(ii) Micro voltmeter with diagram
(iii) Vertical Amplifier
30. Draw the block diagram of EEG unit and express the working of
different parts in it.
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