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Process Control and Instrumentation

Process Control and Instrumentation
The transfer function of a first order system is

S/(Ts + 1)
1/(Ts + 1)
1/Ts
None of these

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Process Control and Instrumentation
Which of the following filled system expansion thermometer has the capability to measure the lowest temperature?

Alcohol in glass thermometer
Mercury in steel thermometer
Fused metal (Na or K) in steel thermometer
Mercury in glass thermometer

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Process Control and Instrumentation
Gas chromatography is used for the measurement of

Pressure
Concentration
Temperature
Flow rate

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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.

25
75
100

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Process Control and Instrumentation
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

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

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

High transmissivity of radiation
Polished surface
Low emissivity
Very thick walls

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