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Process Control and Instrumentation

Process Control and Instrumentation
Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

0.0001
0.01
0.001
0.1

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

Low loads
None of these
Temperature changes
Flow rate changes

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Process Control and Instrumentation
Thermocouple is suitable for measuring

Both high and low temperatures
Liquid temperatures only
Very low temperatures only
Very high temperatures only

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Process Control and Instrumentation
Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.

- 10 and 425
- 39 and 350
- 51 and 439
- 79 and 395

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Process Control and Instrumentation
Liquid column manometers are used for measuring the pressure __________ kgf/cm² .

< 3 (gage)
> 2(gage)
< 10 (gage)
< atmospheric

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Process Control and Instrumentation
Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?

Iron-constantan
Chromel-constantan
All of these
Platinum-platinum + rhodium

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