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PROCESS CONTROL AND INSTRUMENTATION

Process Control and Instrumentation
Stability of a control system containing a transportation lag can be best analysed by

None of these
Frequency response methods
Routh test
Root locus methods

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Process Control and Instrumentation
Starting temperature of optical radiation pyrometer is __________ °C.

1200
400
1500
800

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Process Control and Instrumentation
A system with a double pole at the origin is unstable since the corresponding term in the time domain

Grows linearly with time
Decays linearly with time
Is a constant
Grows exponentially with time

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Process Control and Instrumentation
Use of I-control along with P-control facilitates

Reduction of offset
Reduction of stability time
Elimination of offset
None of these

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Process Control and Instrumentation
Positioning controllers are used for

Low loads
Flow rate changes
High loads
Temperature changes

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