Bengal Engineering and Science University 2006 B.E Electrical Engineering Instrumentation - Question Paper
The ques. paper is with the attachment in pdf format. Ex/BESUS/ EE-604/ 06
B.E. (EE) Part-Ill 6th Semester Examination, 2006 Instrumentation (EE-604)
Time : 3 hours Full Marks : 100
Use separate answerscript _for each half.
Answer SIX questions, taking THREE _from each half.
Two marks are reserved_for neatness in each half.
FIRST HALF
a) Discuss four important properties both for static & dynamic performances of a good instrumentation system.
b) How linear displacement can be measured by potentiometer type transducer? Discuss its constructional features.
c) How loading of a potentiometer type transducer affects its linearity? How it _,A_,4s overcome?
[6+6+4]
identical strain gauges of gauge factor 2 are mounted on the ring and connected in full bridge configuration, calculate the change in out of balance voltage of the bridge for a change of 1 cm of water level. Take bridge supply voltage = 5 V. Also draw the schematic diagram of the system. [6+2+8]
4. a) How displacement is measured by using inductive transducers? Comment
on its linearity.
b) What are the advantages of using push-pull type variable reluctance type transducers? Draw its schematic diagram.
c) How very small displacement can be measured using capacitance transducers?
[6+6+4]
5. a) Write short notes on any two :
i) Diaphragm type pressure transducer
ii) Absolute measurement of acceleration
iii) Active transducers for temperature measurement
b) The resistance of a thermistor at 50C is 1 kQ and 4 kQ at ice point. Calculate the characteristic coefficients P and a at an ambient of 25C. [(2x6)+4]
6. a) Explain with circuit diagram the use of instrumentation amplifier in connection
with load cell.
b) Give pin detail of uA 725 chip.
c) Draw and explain circuit diagram for a fixed frequency sawtooth generator.
[6+2+8]
7. a) How can you distinguish between the following pairs of filters -
i) Digital/Analog filter ii)
Passive/Active filter iii)
Audio/Radio freq. filter
b) Draw the circuit diagram of a 1 st order Butterworth low pass filter and explain its operation.
c) Explain with circuit diagram the operation of a DAC with binary weighted resistors. [3+5+8]
8. a) How an op-amp based comparator can be used as a building block of an ADC.
b) Draw and explain the circuit diagram of a V/I converter with grounded load.
c) Draw the circuit diagram of an astable multivibrator using op.amp. and propose the circuit for seperate control of ON time & OFF time. [4+4+8]
9. a) Draw the circuit diagram of a 3-op.amp. configured instrumentation amplifier
and find out the expression of its gain. Discuss the advantages and disadvantages of this circuit and suggest the solution to overcome disadvantages.
b) With the help of a circuit diagram, enlist the gains of a 2-bit programmable gain instrumentation amplifier using analog multiplexers. [8+8]
10. Write short notes on any two : [8+8]
a) Generalised Analog/Digital Close-loop Instrumentation scheme showing different stages from transducer to actuator through DAS, Data logger (Recorder & Display), Controller.
b) CMOS 4-channel MUX-cum-DMUX and its utilisation in instrumentation system.
c) Operation of the single channel digital display system where the input is from an analog transducer circuit (i) using V/f converter, (ii) using V/T converter.
d) Single bit Programmable Gain Bipolar Amplifier with same magnitude of gain.
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| Earning: Approval pending. |
