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Process Control and Instrumentation

Process Control and Instrumentation
Feed forward controller accounts for the __________ changes.

Set point
Neither A nor B
Both A & B
Load

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Process Control and Instrumentation
Psychrometer determines the

Moisture content of solids
Humidity of gases
Water of crystallisation
Hygroscopic nature of solids

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Process Control and Instrumentation
Paramagnetism method is not used for the composition determination of __________ in gases.

Carbon dioxide
Any of these
Oxides of nitrogen
Oxygen

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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
Which of the following is not a composition measuring instrument?

Polarograph
Mass spectrometer
Hot wire anemometer
Thermal conductivity cell

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Process Control and Instrumentation
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

180°
0°
45°
90°

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