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Process Control and Instrumentation

Process Control and Instrumentation
Dilatometer is used to measure

Stress
Strain
Contraction/expansion due to changes in temperature
Deflection

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Process Control and Instrumentation
In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.

None of these
Load
Controlled
Manipulated

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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
Which of the following is not a mechanical pressure sensing element?

Bourdon tube
U-tube
Diaphragm
Bellows

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Process Control and Instrumentation
Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.

> 50
> 100
< 0
0-100

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Process Control and Instrumentation
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer

Increases exponentially
Increases
Decreases
Remains constant

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