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Process Control and Instrumentation

Process Control and Instrumentation
Emission spectroscopy is used for

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

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Process Control and Instrumentation
The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by

Reducing value of Kc
Introducing integral control
Introducing derivative control
None of these

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Process Control and Instrumentation
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

100
95
87.5
63.2

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Process Control and Instrumentation
The unit of 'time constant' of a system is the same as that of

None of these
Time
(time)⁻¹
Velocity

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Process Control and Instrumentation
Flow rate through an orifice is __________ the pressure differential.

Inversely proportional to the square root of
Proportional to
Proportional to the square root of
Inversely proportional to the square of

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Process Control and Instrumentation
Measurement of sub-zero Celcius temperature in industry is done most commonly by

Resistance thermometers
Bi-metallic thermometers
Gas thermometers
Thermocouples

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