Yashwantrao Chavan Maharashtra Open University 2006 Certification TES Instrumentation - I - Question Paper

TES111/20070812
Instrumentation - I
Time : 180 minutes Marks : 100
Instructions for the students :
1. All ques. are compulsory.
2. “Long ans kind ques. (LAQ)” is a supply kind ques. of 20 marks,
which require typical ans of about 60-80 lines in about 32-40 minutes.
3. “Short ans kind ques. (SAQ)” is a supply kind ques. of five marks,
which require typical ans of about 15-20 lines in about 08-10 minutes.
4. Use of non-programmable kind of scientific calculator is allowed.
5. Draw neat diagrams wherever necessary.
6. presume suitable data if necessary.

Long ans kind ques. (LAQ’s)

1. (a) elaborate the objectives of control systems ?
(b) discuss loading effect with an example.
(c) An amplifier outputs a voltage that is ten times the voltage
on its input terminals. It has an input resistance of 10 k
.
A sensor outputs a voltage proportional to temperature with
a transfer function of 20 mV/0C. The sensor has output
resistance of five k
. If the temperature is 500C, obtain the
amplifier output.



2. (a) Draw the circuit diagram of differential instrumentation
amplifier and derive an expression for output of it.
(b) Draw and discuss the operation of dual slope kind ADC.

3. (a) A strain gauge with GF = 2.03 and R = 350
is used in the
circuit beneath.
The bridge resistors are R1=R2=350
and the dummy RD=350
.
If a strain of 1450 µm/m is applied, obtain the bridge offset voltage
if Vs=10V.
(b) discuss the various techniques used for reference junction
compensation in thermocouple.


4. (a) discuss the working principles of electro-magnetic flow
meter with a neat diagram.
(b) elaborate the various properties of laser light ? discuss.


Short ans kind ques. (SAQ’s)
5. What is the necessity of linearization circuit ? 5
6. discuss the working of sample and hold circuit. 5
7. discuss any 1 application of load cell. 5
8. With a symbol discuss the working of photodiode.

Earning:   Approval pending.