This document contains an exam for an Instrumentation course with 8 questions. Question 1 defines key terms related to instrumentation accuracy and errors. Question 2 describes the principle and applications of the Bourdon tube and ionization gauge. Question 3 derives an expression for potentiometric transducers and calculates the maximum nonlinearity error and optimal potentiometer value. Question 4 discusses materials used in strain gauges and the relationship between gauge factor and Poisson's ratio. Question 5 explains the magnetostrictive effect and operation of a magnetostrictive transducer and photo pulse pickup transducer. Question 6 describes the principles of dual slope integrating analog to digital conversion. Question 7 explains dual slope ramp digital voltmeters and laser Doppler anemometry. Question 8

1. JNTUW
ORLD
Code No: D6403
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
M.Tech II - Semester Examinations, March/April 2011
INSTRUMENTATION
(POWER ENGINEERING AND ENERGY SYSTEMS)
Time: 3hours Max. Marks: 60
Answer any five questions
All questions carry equal marks
- - -
1. a) Define the terms:
i) Accuracy ii) Precision iii) Sensitivity
iv) Resolution v) Lag vi) Repeatability vii) Reproducibility
viii) Limiting error, giving examples and bringing out the differences between them.
b) A voltmeter having a sensitivity of 15 /k vΩ reads 100V in its 300V scale when
connected across an un known resistor when the current through the resistor is 2.0 mA.
Calculate the percentage error due to loading effect. [12]
2. a) With the help of a neat sketch explain the principle and working of Bourdon Tube. What are
its applications?
b) Draw the sketch and explain the principle and working of Ionisation gauge. [12]
3. a) Derive the expression for
eo
e
ex
in the case of potentiometer transducers. What is the
maximum % error that can occur due to non-linearity in these transducers? Deduce the
relatives.
b) A potentiometric transducer is being used in conjunction with a recorder of 15kΩ input
resistance. Non- Linearity is to be controlled to within 1.2% Potentiometers of 10W rating
with values form 100Ω to 10kΩ are available in steps of 100Ω . Determine the
value of potentiometer which gives the greatest sensitivity. [12]
4. a) Explain about the materials used for filament wires, base carrier materials, strain gauges
cements used in the construction of strain gauges.
b) Describe the relation ship between gauge factor and Piossson’sgation of a strain gauge
material. [12]
5. a) What is magneto strictive effect? Describe the principle and operation of magneto strictive
transducer.
b) Draw the circuit schematic and explain the principle of operation of photo pulses pick up
transducer. [12]
6. a) With the help of necessary graphs, explain the principle and working of Dual Slope
Integrating type ADC.
b) Draw the schematic and explain the principle of weighted Resistor Network type DAC. [12]
7. a) Draw the graphs and explain the principle and working of Dual Slope ramp type DVM.
b) What is the principle of Laser Doppler Anemometer? Explain its working. [12]
8. Write notes on any Two
a) Computer Aided Measurements b) IEEE 488 Electrical Interface
c) Smart Transmitters [12]
********
R09
www.jntuworld.com
www.jntuworld.com