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Process Control and Instrumentation

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
A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is

-180°
-45°
-90°
45°

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Process Control and Instrumentation
Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

0.1
0.001
0.0001
0.01

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Process Control and Instrumentation
Hot wire anemometer is used for the measurement of

Very high temperature
Flow rates of granular solids
Thermal conductivity of gases
Flow rates of fluids

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Process Control and Instrumentation
The transfer function for a P-D controller is

Kc(1+τD s)
Kc/τD s
Kc(1 +1/τD s)
Kc τD s

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Process Control and Instrumentation
Thermal conductivity measurement is used for the determination of

Specific gravity of petrofuels
Composition of an alloy
O₂ percentage in the flue gas
CO₂ percentage in the flue gas

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