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Process Control and Instrumentation

Process Control and Instrumentation
A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.

Hydrogen
Nitrogen
Helium
None of these

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Process Control and Instrumentation
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer

Increases exponentially
Remains constant
Decreases
Increases

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Process Control and Instrumentation
The transfer function of a process is 1/(16s² + 8s + 4). If a step change is introduced into the system, then the response will be

Under damped
Critically damped
Over damped
None of these

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Process Control and Instrumentation
A system with transfer function (2S/4S) + 1 is of __________ order.

Zero
2nd
1st
3rd

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Process Control and Instrumentation
Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is

Carbon tetrachloride
Ethylene glycol
Water
Paraffin

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Process Control and Instrumentation
In second order underdamped system,

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

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