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Process Control and Instrumentation

Process Control and Instrumentation
Which is the strongest paramagnetic gas?

CO₂
O₂
NO₂
NO

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

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

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Process Control and Instrumentation
A bolometer is

Used for the measurement of thermal radiation
Neither A nor B Here
Both A & B Here
An element which senses optical input and delivers thermal output

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Process Control and Instrumentation
Which of the following is not a differential pressure flow meter?

Flow nozzle
Venturimeter
Rotameter
Orificemeter

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Process Control and Instrumentation
Which thermocouple can be used to measure a temperature of around 1400°C ?

Platinum-platinum+rhodium
None of these
Aluminium-chromel
Copper-constantan

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Process Control and Instrumentation
A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.

Routh stability
Nyquist
None of these
Bode stability

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