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Process Control and Instrumentation

Process Control and Instrumentation
The frequency response of a first order system, has a phase shift with lower and upper bounds given by

- ∞, π/2
-π/2, 0
-π/2, π/2
0, π/2

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

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Process Control and Instrumentation
__________ temperature scale assigns 0° to the 'ice point' and 80° to the 'steam point'

Rankine
Reumur
Farenhite
Celcius

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Process Control and Instrumentation
A typical example of a physical system with under damped characteristic is a

U-tube manometer
Thermocouple kept immersed in a liquid filled thermowell
CSTR with first order reaction
Spring loaded diaphragm valve

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Process Control and Instrumentation
Which of the following is a 'contact' pyrometer?

Infra red pyrometer
Optical pyrometer
Radiation pyrometer
Resistance pyrometer

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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

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

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