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Process Control and Instrumentation

Process Control and Instrumentation
Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)

nRT/V
nRT/P
V/nRT
p/nRT

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Process Control and Instrumentation
Degree to which an instrument indicates the changes in measured variable without dynamic error is called its

Fidielity
Reproducibility
Static characteristics
Speed of response

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Process Control and Instrumentation
Pyrometry refers to the measurement of temperature

All of these
Directly
Which is of higher magnitude
With the mercurial thermometer upto 350°C

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Process Control and Instrumentation
Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

Low flash point
High viscosity index
Low thermal conductivity
Low electrical conductivity

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Process Control and Instrumentation
Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

Inconel
Nichrome
Vycor (a glass)
Steel

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Process Control and Instrumentation
Which of the following controllers has the least maximum deviation?

P-controller
P-I controller
P-D controller
P-I-D controller

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