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Process Control and Instrumentation

Process Control and Instrumentation
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

Sum
Product
Difference
Ratio

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

3
5
1
2

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Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

Τds + 1
Eτds
E-τds
1/(τds + 1)

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

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

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Process Control and Instrumentation
The term analogous to voltage in a single tank system is the

Liquid volume in the tank
Heat content of the system
Level of liquid
Flow rate

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Process Control and Instrumentation
Psychrometer determines the

Water of crystallisation
Hygroscopic nature of solids
Moisture content of solids
Humidity of gases

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