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Process Control and Instrumentation

Process Control and Instrumentation
Which of the systems having following transfer functions is stable?

Exp(-20s)/(s² + 2s-l)
1/(s² + 2s + 2)
1/(s²-2s + 3)
1/(s²+ 2)

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Process Control and Instrumentation
A non-linear chemical system is exemplified by a/an

None of these
Non-isothermal CSTR
Mixer
Isothermal CSTR

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Process Control and Instrumentation
Liquid argon level in a pressurised storage tank (at 3 kg/cm² ) is measured by a/an

Differential pressure gage
External float gage
Gage glass
None of these

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Process Control and Instrumentation
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.

63.2
87.5
95
100

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Process Control and Instrumentation
Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C?

Optical pyrometer
Radiation pyrometer
Thermocouples
Photoelectric pyrometer

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Process Control and Instrumentation
In a single tank system, the transfer function of level to inlet flow rate is

R/TS
1/TS
L(TS + l)
R/(TS + 1)

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