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Process Control and Instrumentation

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

75
25
100

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Process Control and Instrumentation
Typical specifications for design stipulates the gain margin and phase margin to be respectively

> 1.7 and > 30°
< 1.7 and < 30°
< 1.7 and > 30°
> 1.7 and < 30°

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Process Control and Instrumentation
Specific gravity of a liquid can not be measured by a/an

Anemometer
Hydrometer
Specific gravity bottle
Pycnometer

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Process Control and Instrumentation
Which of the following thermometers is not suitable for distant reading upto 60 metres?

Mercury in glass thermometer
Resistance thermometer
Constant volume gas thermometer
Vapor pressure thermometer

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

None of these
Mixer
Non-isothermal CSTR
Isothermal CSTR

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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

π/3
π/6
5π/12
π/12

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