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Process Control and Instrumentation

Process Control and Instrumentation
Phase margin is equal to

Phase lag + 180°
Phase lag + 90°
180° - phase lag
Phase lag - 180°

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Process Control and Instrumentation
Change of angle of refraction with composition comprises the working principle of a

Refractrometer
Polarimeter
Polarograph
Spectrometer

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Process Control and Instrumentation
Meleoid gauge measures the __________ pressure.

Atmospheric
Very high
Positive
Sub-atmospheric

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Process Control and Instrumentation
In second order underdamped system,

Large damping co-efficient means smaller damping
Decay ratio = overshoot
Overshoot increases for increasing damping co-efficient
Decay ratio = (overshoot)²

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Process Control and Instrumentation
Liquid levels in autocalves are measued by

Glass gauge
Simple float
None of these
Differential float type manometer

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Process Control and Instrumentation
Liquid column manometers are used for measuring the pressure __________ kgf/cm² .

> 2(gage)
< 3 (gage)
< atmospheric
< 10 (gage)

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