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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

Frequency response methods
None of these
Root locus methods
Routh test

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

1500
800
400
1200

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

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

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

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Process Control and Instrumentation
Positioning controllers are used for

Low loads
Temperature changes
Flow rate changes
High loads

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