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Process Control and Instrumentation

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

45°
-180°
-45°
-90°

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Process Control and Instrumentation
In an exothermic chemical reactor, the manipulated variable is the flow rate of

Product
None of these
Reactants
Coolant

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Process Control and Instrumentation
The time constant of a first order process with resistance R and capacitance C is

RC
R - C
R + C
1/RC

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Process Control and Instrumentation
Mcleoid gauge is used to measure the

Vacuum
Point velocity
Pressure
Flow rate

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Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

Air
Oil
A metal powder or graphite
Mercury

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Process Control and Instrumentation
Conversion formula for converting amplitude ratio (AR) into decibels is

Decibel = 20 loge (AR)
Decibel = 20 log10 (AR)
Decibel = 20 loge (AR)0.5
Decibel = 20 log10 (AR)0.5

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