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Process Control and Instrumentation

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

54
68
12
36

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Process Control and Instrumentation
Flow rate through an orifice is __________ the pressure differential.

Inversely proportional to the square of
Proportional to
Proportional to the square root of
Inversely proportional to the square root of

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Process Control and Instrumentation
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?

O₂
CO
N₂
CO₂

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Process Control and Instrumentation
__________ is an example of distributed parameter system

CSTR
None of these
On-off controller
Tubular reactor

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Process Control and Instrumentation
__________ thermometer can not measure sub-zero (< 0° C) temperature,

Resistance
Mercury in glass
Bimetallic
Vapor pressure

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Process Control and Instrumentation
Conversion formula for converting amplitude ratio (AR) into decibels is

Decibel = 20 log10 (AR)0.5
Decibel = 20 loge (AR)
Decibel = 20 loge (AR)0.5
Decibel = 20 log10 (AR)

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