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Process Control and Instrumentation

Process Control and Instrumentation
Flame photometry is used for the determination of compositional analysis of

Isotopes
Alkali metals
Natural gas
Solids

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Process Control and Instrumentation
The transfer function of a process is 1/(16s² + 8s + 4). If a step change is introduced into the system, then the response will be

None of these
Under damped
Critically damped
Over damped

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Process Control and Instrumentation
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.

250
550
350
700

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Process Control and Instrumentation
__________ thermometer can not measure sub-zero (< 0° C) temperature,

Bimetallic
Resistance
Vapor pressure
Mercury in glass

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Process Control and Instrumentation
The function of a transducer is to

Amplify the input signal
Modify the input signal
Codify/decodify the input signal
Convert the primary signal into a more useful quantity, usually an electric impulse

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Process Control and Instrumentation
Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is

Ethylene glycol
Water
Carbon tetrachloride
Paraffin

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