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Process Control and Instrumentation

Process Control and Instrumentation
On-off controllers are normally used for

Low loads
Temperature changes
Flow rate changes
None of these

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Process Control and Instrumentation
Thermistors are used in __________ devices.

Both B & C
Voltage measuring
Temperature measuring
Temperature compensating

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Process Control and Instrumentation
Emission spectroscopy is used for

NOxdetermination
Determination of CO₂ in gases
Solids and metal analysis
Determining water purity

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Process Control and Instrumentation
The response of two tanks of same size and resistance in series is

Over damped
Under damped
None of these
Critically damped

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Process Control and Instrumentation
Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature

Rusting of iron takes place
Embrittlement of iron occurs
Emf produced is very low of the order of microvolt
Both B and C Here

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

Root locus methods
Routh test
Frequency response methods
None of these

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