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Process Control and Instrumentation

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

Stable
None of these
Unstable
Critically damped

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

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

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Process Control and Instrumentation
Non-metallic diaphragm used as pressure sensor in instruments is generally made of

Teflon
Thick paper
Bakelite
Synthetic rubber

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Process Control and Instrumentation
Number of poles in a system with transfer function 1/(s² + 2s² + 1) is

5
3
1
2

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Process Control and Instrumentation
Working principle of radiation pyrometer is based on the

Wien's law
Seebeck effect
Stafan-Boltzman law
Kirchoffs law

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Process Control and Instrumentation
Mercury thermometer can be used to measure the temperature upto __________ °C.

750
250
100
350

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