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Process Control and Instrumentation

Process Control and Instrumentation
Bode stability method uses __________ loop transfer function.

Open
Neither A nor B Here
Closed
Either A Or B Here

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Process Control and Instrumentation
Silver point temperature is __________ °C.

960.5
1060.5
860.5
760.5

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

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Process Control and Instrumentation
Thermal wells used in temperature measurements should have

Polished surface
Low emissivity
Very thick walls
High transmissivity of radiation

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Process Control and Instrumentation
Dome temperature of blast furnace stove is most accurately measured by a

Platinum-platinum/rhodium ther-mocuple
Platinum resistance thermometer
Radiation pyrometer
Iron-constantan thermocouple

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

2
5
3
1

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