Gujarat Technological University 2011 M.E Low Temperature asurent and Instruntation - Question Paper

Seat No.:__Enrolment No._

GUJARAT TECHNOLOGICAL UNIVERSITY ME Semester -III Examination Dec. - 2011

Subject code: 731001    Date: 05/12/2011

Subject Name: Low Temperature Measurement and Instrumentation Time: 10.30 am - 01.00 pm    Total Marks: 70

Instructions:

1.    Attempt all questions.

2.    Make suitable assumptions wherever necessary.

3.    Figures to the right indicate full marks.

Explain the functional stages of measuring systems with a line diagram. 07 Explain clearly the difference between (i) Accuracy and Precision (ii)

Span and Range (iii) Dead zone and Dead time with neat free sketches List out the all various types of thermometers and explain working 07 principle of resistance type thermometer and vapour pressure thermometer with neat sketch

Explain step response of the second order under damped systems. Draw 07 a sketch of response for various damping ratio Z- What should be the ideal range of Z for good control system? Explain why?

Enlist the various types of sensors and transducers. Explain 0 7 (1) capacitive transducers (2) piezoelectric transducer sensors with neat sketches.

What are the selection criteria for instrument transducers? Write a short 07 note on LVDT with neat sketch stating clearly merits and demerits.

Give detail Classification of flow measuring instruments. Write a note 07 on flow visualization with a neat sketch.

Explain calibration of level measuring instruments. Explain how the 07 capacitance level sensor is used for level measurement with neat sketch?

Explain working of hot wire anemometer with neat sketch and 07 advantages and disadvantages.

Explain (1) McLeod Gauge (2) Knudsen gauge for vacuum 07 measurement.

Enlist various techniques for sound measurement. Explain how the 07 sound is measured with microphones. Also write a note on capacitor microphone.

State various methods used for density measurement write a note on 07 density measurement by differential pressure (D/p) transmitter methods.

Q.5 (a) Explain (i) 3He melting curve thermometer (ii) Infrared thermometer with neat sketch. 07 (b) Write a short note on radiography as a non- destructive testing method. OR 07 Q.5 (a) How the calibration of thermometer is done? Explain errors and precautions in temperature measurement. 07 (b) Explain ultrasonic techniques used for non destructive testing. 07

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Attachment: gujarat-technological-university-2011-m-e--52855-1.pdf

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