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Process Control and Instrumentation

Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

Eτds
Τds + 1
1/(τds + 1)
E-τds

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Process Control and Instrumentation
Which of the following is not a composition measuring instrument?

Hot wire anemometer
Thermal conductivity cell
Mass spectrometer
Polarograph

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Process Control and Instrumentation
Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?

NO₂
O₂
CO₂
NO

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Process Control and Instrumentation
Pick out the first order system from among the following.

Interacting system of two tanks in series
Damped vibrator
Non-interacting system of two tanks in series
Mercury in glass thermometer kept in boiling water

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Process Control and Instrumentation
The __________ of a vapor pressure thermometer is a secondary element.

Pointer
Bourdon tube
Bulb
None ofthese

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

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

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