Mechanical Measurement Lab Manual

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  • Topic: Pressure, Sensors, Pressure measurement
  • Pages : 22 (6091 words )
  • Download(s) : 69
  • Published : May 18, 2013
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List of Experiments :

1. To Study various Temperature Measuring Instruments and to Estimate their Response times. (a) Mercury – in glass thermometer
(b) Thermocouple
(c) Electrical resistance thermometer
(d) Bio-metallic strip

2. To study the working of Bourdon Pressure Gauge and to check the calibration of the gauge in a deadweight pressure gauge calibration set up.

3. To study a Linear Variable Differential Transformer (LVDT) and use it in a simple experimental set up to measure a small displacement.

4. To study the characteristics of a pneumatic displacement gauge.

5. To measure load (tensile/compressive) using load cell on a tutor.

6. To measure torque of a rotating shaft using torsion meter/strain gauge torque transducer.

7. To measure the speed of a motor shaft with the help of non-contact type pick-ups (magnetic or photoelectric).

8. To measure the stress & strain using strain gauges mounted on simply supported beam/cantilever beam.

9. To measure static/dynamic pressure of fluid in pipe/tube using pressure transducer/pressure cell.

10. To test experimental data for Normal Distribution using Chi Square test.

11. To learn the methodology of pictorial representation of experimental data and subsequent calculations for obtaining various measures of true value and the precision of measurement using Data acquisition system/ calculator.

12. Vibration measurement by Dual Trace Digital storage Oscilloscope.

13. To find out transmission losses by a given transmission line by applying capacitive /inductive load.

14. Process Simulator.

Note:
1. At least ten experiments are to be performed in the Semester. 2. At least seven experiments should be performed from the above list. Remaining three experiments may either be performed from the above list or designed & set by the concerned institution as per the scope of the Syllabus.

Experiment No:1

Aim: To Study various Temperature Measuring Instruments and to Estimate their Response times. (a) Mercury – in glass thermometer
(b) Thermocouple
(c) Electrical resistance thermometer
(d) Bi-metallic strip

Apparatus used: Mercury thermometer, Thermocouple setup, Platinum thermometer and Bi-metallic strip.

Theory:

(a) Mercury – in glass thermometer:

A liquid-in-glass thermometer is widely used due to its accuracy for the temperature range -200 to 600°C. Compared to other thermometers, it is simple and no other equipment beyond the human eye is required. The LIG thermometer is one of the earliest thermometers. It has been used in medicine, metrology and industry. In the LIG thermometer the thermally sensitive element is a liquid contained in a graduated glass envelope. The principle used to measure temperature is that of the apparent thermal expansion of the liquid. It is the difference between the volumetric reversible thermal expansion of the liquid and its glass container that makes it possible to measure temperature. The liquid-in-glass thermometer comprises of

1. A bulb, a reservoir in which the working liquid can expand or contract in volume 2. A stem, a glass tube containing a tiny capillary connected to the bulb and enlarged at the bottom into a bulb that is partially filled with a working liquid. The tube's bore is extremely small - less than 0.02 inch (0.5 millimetre) in diameter 3. A temperature scale is fixed or engraved on the stem supporting the capillary tube to indicate the range and the value of the temperature. It is the case for the precision thermometers whereas for the low accurate thermometers such as industrial thermometer, the scale is printed on a separate card and then protected from the environment. The liquid-in-glass thermometers is usually calibrated against a standard thermometer and at the melting point of water 4. A reference point, a calibration point, the most common being the ice point 5. A working liquid, usually mercury or alcohol

6. An inert gas is used for mercury intended to...
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