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Process Control and Instrumentation

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

Both B and C
Chromatograph
Mass spectrometer
Haldane apparatus

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Process Control and Instrumentation
Gain margin is equal to the

Gain in P-I controller
Reciprocal of amplitude ratio
Gain in P controller
Amplitude ratio

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Process Control and Instrumentation
Positioning controllers are used for

Temperature changes
High loads
Flow rate changes
Low loads

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Process Control and Instrumentation
Polarograph is meant for the analysis of

Solids
Gaseous mixture
Miscible liquids
Isotopes

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Process Control and Instrumentation
Pick out the one which is a first order instrument.

Mercury in glass thermometer (without any covering or air gap)
Bare vapor pressure thermometer
Bare metallic thermometer
All of these

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Process Control and Instrumentation
0n-off control which is a special case of proportional control, has a band width of about __________ percent.

25
100
75

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