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Process Control and Instrumentation

Process Control and Instrumentation
A non-linear system will have __________ steady state values.

More than one
Two
One
Three

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Process Control and Instrumentation
A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.

Bode stability
None of these
Nyquist
Routh stability

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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 fidelity
Increase the sensitivity
Reduce measuring lag

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Process Control and Instrumentation
An amplitude ratio of 0.1 corresponds to __________ decibels.

-10
20
10
-20

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Process Control and Instrumentation
Response of a system to a sinusoidal input is called __________ response.

Unit step
None of these
Frequency
Impluse

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

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

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