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Process Control and Instrumentation

Process Control and Instrumentation
Stability of a control system containing a transportation lag can be best analysed by

None of these
Routh test
Frequency response methods
Root locus methods

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

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

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Process Control and Instrumentation
Composition of natural gas is determined by the

Chromatograph
Haldane apparatus
Both B and C
Mass spectrometer

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Process Control and Instrumentation
Photoelectric pyrometers are suitable in the temperature range of __________ °C.

400-1600
800-1600
400-1000
800-2500

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Process Control and Instrumentation
Which of the following thermocouples can measure the maximum temperature?

Chromel-alumel
Iron-constantan
Platinum-rhodium
Tungsten-molybdenum

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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
None of these
Bode stability
Nyquist

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