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Process Control and Instrumentation

Process Control and Instrumentation
Mass spectrometer is used for the composition analysis of

Isotopes
None of these
Solids
Alloys

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Process Control and Instrumentation
Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature

Rusting of iron takes place
Embrittlement of iron occurs
Both B and C Here
Emf produced is very low of the order of microvolt

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Process Control and Instrumentation
A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is

-45°
-180°
-90°
45°

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Process Control and Instrumentation
Humidity of air can be determined by a

Sling psychrometer
Chromatograph
Mass spectrometer
Polarimeter

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Process Control and Instrumentation
Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

0.0001
0.001
0.1
0.01

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Process Control and Instrumentation
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

54
36
12
68

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