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.

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31.
Which of the following temperature measuring devices is widely used to measure the temperature in furnaces?

Resistance thermometer

Radiation pyrometer

Iron-constantan thermocouple

Bimetallic thermometer

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

33.
A constant-volume gas thermometer works on

The principle of Archimedes

Boyles law

Pascals law

Charles law

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

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

39.
Which of the following metals/alloys has the maximum thermal coefficient of linear expansion?

Chromel

Brass (70-30)

Nickel

Invar

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

41.
The pressure thermometer bulb should have a

Large area

Large mass

Large specific heat

Low thermal conductivity

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

43.
Thermocouples use two

Dissimilar metal wires

Similar metal wires

Similar metal strips

Dissimilar metal strips

44.
The generation of e.m.f. in thermocouples is fundamentally explained by

Ohms law

Stefan-Boltzmans law

Seebeck effect

Joule heating effect.

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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