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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2007/
Module Title: Instrumentation & Calibration
Module Code: PHYS 6009
School: Mechanical and Process Engineering
Programme Title: Bachelor of Engineering in Biomedical Engineering – Year 1
Programme Code: EBIME_7_Y
External Examiner(s): Mr. M. Murphy , Dr. G. McGuinness
Internal Examiner(s): Mr. D. Polley
Instructions: Attempt THREE out of the four questions. All carry 25 marks each.
Duration: Two hours
Sitting: Winter 2007
Requirements for this examination: N/A
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you are attempting the correct examination paper. If in doubt please contact an Invigilator.
1. (a) In an experiment to calibrate a Pressure transducer , the following data was obtained.
(i) Plot a calibration graph. Ensure you include graph title, axes labels etc (10 marks) (ii) Determine the output span of the instrument. (2 marks) (iii) Calculate the maximum hysterisis error and the pressure at which it occurs. (3 marks) (iv) Express the error as a percentage of output span. (3 marks) (b) Write notes to clarify the difference between Accuracy and Precision (7 marks)
2. (a) Define the terms Gauge Pressure and Absolute Pressure. (3 marks)
(b) Sketch a fully labelled diagram of a well-type manometer for measuring differential pressure. Explain what advantage this type has over a simple U-tube manometer. (10 marks) (c) A well-type manometer is being used to measure gauge pressure. It is filled with mercury of density 13600 kgm-3^. The well diameter is 110 mm and the limb diameter is 10 mm. Determine the area ratio of the manometer. Calculate the gauge pressure when the height reading on the limb scale is 40 mm. (12 marks)
Applied Pressure (Bar) 0 1.0 2.0 3.0 4.0 5.0 6.0 7. Output for P increasing (mA) 4.0 6.8 9.4 12 14 16 18 20 Output for P decreasing (mA) 4.0 5.8 7.8 9.6 12.4 15 17.6 20
