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Process Instrumentation and Control - Interview Questions and Answers

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41. Which of the following glass is used for 00-600�C temperature measurement by mercury-in-glass thermometer :
A. lead glass
B. normal grade
C. borosilicate
D. supermax
E. any one of the above.
Explanation:
42. Cold junction compensation is needed in ase of measurement of temperature by :
A. thermocouple
B. thermopile
C. thermistor
D. zener diode
E. resistance thermometer.
Explanation:
43. Which of the following consists of a very thin strip of nickel or platinum foil which responds to temperature in the same manner as the resistance thermometer :
A. thermo pile
B. bolometer
C. radiation pyrometer
D. thermistor
E. optical pyrometer.
Explanation:
44. Motion of fast-moving systems may be timed and studied by means of a :
A. stroboscope
B. piezoelectric crystal
C. electronic timer
D. chronometer
E. photovoltaic cell.
Explanation:
45. Twisting the thermocouple wires together and heat welding them :
A. is the standard practice of making junction
B. would result in noise generation
C. cause small errors due to local e.m.f. which may arise if the junction is too long
D. would slow down the response
E. result in inaccuracies.
Explanation:
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