Instrumentation & Process control Mcqs
This set of Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Instrumentation & Process control ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Chemical Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Instrumentation & Process control comprehensively.
32. Which of the following temperature measuring devices is widely used measure tube side temperature in a shell and tube heat exchanger?
Radiation pyrometer
Ordinary mercury-in-glass thermometer
Thermocouple
Constant-volume helium thermometer
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33. A constant-volume gas thermometer works on
The principle of Archimedes
Boyles law
Pascals law
Charles law
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34. Ordinary mercury-in-glass thermometer works on the principle of
Volumetric expansion of mercury with increase in temperature
Increase of vapour pressure with increase in temperature
Increase of electrical resistance with increase in temperature
Decrease of vapour pressure with increase in temperature
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35. The volumetric expansion of a liquid caused by temperature changes is minimum for
Mercury
Ethyl alcohol
Toluene
Pentane
36. Bimetallic thermometer works on the principle of
Increase in electrical resistance with increase in temperature
Linear thermal expansion of metals
Volumetric expansion of metals
B
37. Bimetallic thermometers use
Two similar metal wires
Two dissimliar metal wires
Two strips of metals welded together having different coefficients of thermal expansion
Two strips of metals welded together having same coefficient of thermal expansion
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38. Thermal coefficient of linear expansion has the units of
K-1
M/K
M3/K
M
39. Which of the following metals/alloys has the maximum thermal coefficient of linear expansion?
Chromel
Brass (70-30)
Nickel
Invar
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40. When a strip made of iron and copper is heated
It does not bend
It gets twisted
It bends with iron on concave side
It bends with iron on convex side
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41. The pressure thermometer bulb should have a
Large area
Large mass
Large specific heat
Low thermal conductivity
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42. Vapour pressure thermometers work on the principle of
Increase of vapour pressure with decrease in temperature
Increase of vapour pressure with increase in temperature
Volumetric expansion of vapour with increase in temperature
Increase in electric resistance with increase in temperature
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43. Thermocouples use two
Dissimilar metal wires
Similar metal wires
Similar metal strips
Dissimilar metal strips
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44. The generation of e.m.f. in thermocouples is fundamentally explained by
Ohms law
Stefan-Boltzmans law
Seebeck effect
Joule heating effect.
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45. Which one of the following thermocouples develops least e.m.f. for the same difference of temperature between hot and cold junctions?
Iron-constantan
Copper-constantan
Chromel-alumel
Platinum-platium + 13% rhodium
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