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Process Control and Instrumentation

Process Control and Instrumentation
Bourdon tube is never made of

Monel metal
Cast iron
Phosphor bronze
Stainless steel

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Process Control and Instrumentation
Smoke density of the flue gas going out of the chimney is measured by a

Photo electric cell
Chromatograph
Polarograph
Thermal conductivity meter

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Process Control and Instrumentation
Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by __________ effect.

None of these
Seebeck
Peltier
Thomson

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Process Control and Instrumentation
Which is the strongest paramagnetic gas?

CO₂
NO₂
NO
O₂

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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.

Bode stability
Nyquist
None of these
Routh stability

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Process Control and Instrumentation
Emission spectroscopy is used for

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

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