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Process Control and Instrumentation

Process Control and Instrumentation
__________ stability method uses open loop transfer function.

Ruth
Mikhalov
None of these
Nyquist

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Process Control and Instrumentation
A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.

Hydrogen
None of these
Helium
Nitrogen

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Process Control and Instrumentation
Stability of a control system containing a transportation lag can be best analysed by

Routh test
Root locus methods
None of these
Frequency response methods

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Process Control and Instrumentation
Thermocouple in a thermal well behaves as a true

Second order system (underdamped)
Second order system (overdamped)
First order system
Multiple first order system

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Process Control and Instrumentation
A system with a double pole at the origin is unstable since the corresponding term in the time domain

Decays linearly with time
Grows linearly with time
Grows exponentially with time
Is a constant

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Process Control and Instrumentation
Thermal wells used in temperature measurements should have

High transmissivity of radiation
Low emissivity
Polished surface
Very thick walls

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