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Process Control and Instrumentation

Process Control and Instrumentation
In an exothermic chemical reactor, the manipulated variable is the flow rate of

Reactants
Coolant
Product
None of these

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

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Process Control and Instrumentation
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?

13
29
3
0.1

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Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is

Iron-constantan
Chromel-alumel
Platinum-platinum+rhyodium
Platinum-rhodium

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Process Control and Instrumentation
In second order underdamped system,

Overshoot increases for increasing damping co-efficient
Decay ratio = overshoot
Large damping co-efficient means smaller damping
Decay ratio = (overshoot)²

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