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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/3
π/6
π/12

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Process Control and Instrumentation
Presence of a small amount of water in the organic systems can be determined by the __________ method.

Emission spectroscopy
Dielectric constant end loss factor
Polarimetry
Electrical conductivity

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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
Flow rate of sludge is not measured by a/an

Kennison nozzle
Orificemeter
Both B & C
Open weir

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Process Control and Instrumentation
Thermistors are made of

Nickel-chromium alloys
Ultra pure metals
Metal oxides
Iron-copper alloys

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Process Control and Instrumentation
Number of poles in a system with transfer function 1/(s² + 2s² + 1) is

2
3
1
5

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