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Process Control and Instrumentation

Process Control and Instrumentation
When the damping co-efficient (ξ) is unity, the system is

Critically damped
Underdamped
Highly fluctuating
Overdamped

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Process Control and Instrumentation
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

Kc is increased
Kc is reduced
Derivative control action is introduced
Integral control action is introduced

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

Refractrometer
Polarograph
Dilatometer
Polarimeter

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Process Control and Instrumentation
Which of the following thermometers is not suitable for distant reading upto 60 metres?

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

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Process Control and Instrumentation
In Bode plot, A.R. vs. w is plotted on a/an __________ graph paper.

Ordinary
Log-lag
Semi-log
Triangular

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Process Control and Instrumentation
Which of the following thermocouples has the widest temperature measurement range?

Iron-constantan
Copper-constantan
Chromel-alumel
Platinum-platinum/rhodium

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