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Process Control and Instrumentation

Process Control and Instrumentation
On-off controllers are normally used for

Low loads
None of these
Temperature changes
Flow rate changes

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Process Control and Instrumentation
Bode diagram is a plot of

None of these
Log (AR) vs. log (f) and (Φ) vs. log (f)
AR vs. log (f) and Φ vs. log (f)
Log (AR) vs. f and log Φ vs.f

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Process Control and Instrumentation
Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?

Platinum resistance thermometer
Radiation pyrometer
Mercury in glass thermometer
Vapor pressure thermometer

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Process Control and Instrumentation
pH meter has

One cell
No cell
Two cells
Three cells

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Process Control and Instrumentation
The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by

None of these
Introducing integral control
Introducing derivative control
Reducing value of Kc

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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?

None of these
Thomson effect
Seebeck effect
Peltier effect

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