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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is a desirable characteristic of an instrument?

High measuring lag
High fidelity
Poor reproducibility
High drift

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Process Control and Instrumentation
The fluid used in hydraulic controller is

Steam
Air
Water
Oil

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Process Control and Instrumentation
The temperature range for which copper resistance thermometer can be used is __________ °C

0 to 150
-200 to 150
350 to 750
500 to 900

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Process Control and Instrumentation
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

Chromel-alumel
Either A, B or C
Iron-constantan
Platinum-platinum+rhodium

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Process Control and Instrumentation
Thermal wells are used in the temperature measurement to

Reduce measuring lag
Guard against corrosive and oxidising action on thermocouple materials
Increase the sensitivity
Increase the fidelity

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Process Control and Instrumentation
A negative gain margin expressed in decibels means a/an __________ system.

Critically damped
None of these
Unstable
Stable

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