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Process Control and Instrumentation

Process Control and Instrumentation
The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

5π/12
π/6
π/12
π/3

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Process Control and Instrumentation
What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?

< 1
>1
1
None of these

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Process Control and Instrumentation
Compositional analysis of flue gas coming out of a furnace in respect of O₂ and CO₂% can be continuously done by a/an

Orsat apparatus
Thermal conductivity cell
Zirconia probe
Chromatograph

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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?

Thermocouples
Radiation pyrometer
Photoelectric pyrometer
Optical pyrometer

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Process Control and Instrumentation
Thermocouple is suitable for measuring

Both high and low temperatures
Very low temperatures only
Very high temperatures only
Liquid temperatures only

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Process Control and Instrumentation
Mcleoid gauge is used to measure the

Point velocity
Pressure
Flow rate
Vacuum

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