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Process Control and Instrumentation

Process Control and Instrumentation
Dead zone in an instrument must be less than __________ percent of the scale.

1.5
8
4
0.2

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

Reactants
None of these
Product
Coolant

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Process Control and Instrumentation
Which of the following thermocouples is capable of measuring a temperature of -50°C?

Platinum - platinum + rhodium
Chromel - alumel
Copper - constantan
Iron-constantan

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Process Control and Instrumentation
Pressure of 0.0001 absolute psi can be measured by __________ gauge

Thermocouple
Pirani
None of these
Mcloid

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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)0.5
Decibel = 20 log10 (AR)

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Process Control and Instrumentation
0n-off control which is a special case of proportional control, has a band width of about __________ percent.

100
75
25

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