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Process Control and Instrumentation

Process Control and Instrumentation
Liquid argon level in a pressurised storage tank (at 3 kg/cm² ) is measured by a/an

None of these
Differential pressure gage
External float gage
Gage glass

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

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

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Process Control and Instrumentation
A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is

-180°
-90°
-45°
45°

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Process Control and Instrumentation
__________ are analysed using a polarograph.

Gases
Isotonic solutions
Solids
Liquids

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Process Control and Instrumentation
__________ controller has the maximum stabilising time.

P
PI
PD
PID

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Process Control and Instrumentation
The closed loop pole of a stable second order system could be

Complex conjugate with positive real parts
Both real and positive
Both real and negative
One real positive and the other real negative

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