Engineering :: Instrumentation and Process Control

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31.

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

A.	Resistance thermometer	B.	Radiation pyrometer
C.	Iron-constantan thermocouple	D.	Bimetallic thermometer

32.

Which of the following temperature measuring devices is widely used measure tube side temperature in a shell and tube heat exchanger?

A.	Radiation pyrometer	B.	Ordinary mercury-in-glass thermometer
C.	Thermocouple	D.	Constant-volume helium thermometer

33.

A constant-volume gas thermometer works on

A.	the principle of Archimedes	B.	Boyles law
C.	Pascals law	D.	Charles law

34.

Ordinary mercury-in-glass thermometer works on the principle of

A.	volumetric expansion of mercury with increase in temperature	B.	increase of vapour pressure with increase in temperature
C.	increase of electrical resistance with increase in temperature	D.	decrease of vapour pressure with increase in temperature

35.

The volumetric expansion of a liquid caused by temperature changes is minimum for

A.	mercury	B.	ethyl alcohol
C.	toluene	D.	pentane

36.

Bimetallic thermometer works on the principle of

A.	increase in electrical resistance with increase in temperature	B.	linear thermal expansion of metals
C.	volumetric expansion of metals

37.

Bimetallic thermometers use

A.	two similar metal wires	B.	two dissimliar metal wires
C.	two strips of metals welded together having different coefficients of thermal expansion	D.	two strips of metals welded together having same coefficient of thermal expansion

38.

Thermal coefficient of linear expansion has the units of

A.	K-1	B.	m/K
C.	m3/K	D.	m

39.

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

A.	Chromel	B.	Brass (70-30)
C.	Nickel	D.	Invar

40.

When a strip made of iron and copper is heated

A.	it does not bend	B.	it gets twisted
C.	it bends with iron on concave side	D.	it bends with iron on convex side