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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
__________ type of element is normally not used in the bimetallic thermometers.

Bourdon tube
Multiple helix
Single helix
Flat spiral

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Process Control and Instrumentation
Optical activity of a solution can be determined using a

Polarograph
Refractrometer
Dilatometer
Polarimeter

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Process Control and Instrumentation
Which of the following does not figure in the list of seven substances selected for international temperature scale?

Zinc (B.P) and mercury (F.P)
Ice (F.P) and steam (B.P)
Antimony and silver (F.P)
Oxygen and sulphur (B.P)

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Process Control and Instrumentation
Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

Steel
Inconel
Nichrome
Vycor (a glass)

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

Routh test
None of these
Root locus methods
Frequency response methods

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