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Process Control and Instrumentation

Process Control and Instrumentation
Pirani gauge is used for the measurement of

Very high pressure
Liquid level at atmospheric pressure
Liquid level under pressure
High vacuum

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Process Control and Instrumentation
Which of the following is the dynamic characteristics of an instrument?

Sensitivity
Dead zone
Reproducibility
Fidelity

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Process Control and Instrumentation
Thermal wells are used in the temperature measurement to

Reduce measuring lag
Guard against corrosive and oxidising action on thermocouple materials
Increase the fidelity
Increase the sensitivity

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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
Which of the following thermometers is not suitable for distant reading upto 60 metres?

Resistance thermometer
Constant volume gas thermometer
Vapor pressure thermometer
Mercury in glass thermometer

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Process Control and Instrumentation
Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?

Peltier effect
Seebeck effect
None of these
Thomson effect

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