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Process Control and Instrumentation

Process Control and Instrumentation
On-off controllers are normally used for

Flow rate changes
None of these
Low loads
Temperature changes

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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
Ratio
Difference

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Process Control and Instrumentation
A manometer measures the __________ pressure.

Atmospheric
Absolute
Gauge
None of these

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

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

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Process Control and Instrumentation
Compositional analysis of flue gas coming out of a furnace in respect of O₂ and CO₂% can be continuously done by a/an

Thermal conductivity cell
Orsat apparatus
Chromatograph
Zirconia probe

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Process Control and Instrumentation
Which of the following controllers has maximum offset?

P-controller
P-I-D controller
P-D controller
P-I controller

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