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Process Control and Instrumentation

Process Control and Instrumentation
Working principle of disappearing filament type optical pyrometer is based on the

Kirchoff's law
Peltier effect
Wien's law
Seebeck effect

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Process Control and Instrumentation
Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

Solid semi-conductor
Liquid semi-conductor
Insulator
Conductor

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Process Control and Instrumentation
Compositional analysis of __________ is done using mass spectrometer.

A solid
An alloy
Natural gas
An isotope

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Process Control and Instrumentation
A sinusoidal variation in the input passing through a linear first order system

Becomes less oscillatory (frequency decreases)
Gets attenuated (magnitude decreases)
Gets amplified (magnitude increases)
Becomes more oscillatory (frequency increases)

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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.

550
250
350
700

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Process Control and Instrumentation
Flow rate of sludge is not measured by a/an

Open weir
Kennison nozzle
Both B & C
Orificemeter

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