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Process Control and Instrumentation

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

Low loads
Temperature changes
None of these
Flow rate changes

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Process Control and Instrumentation
Alphatron measures pressure __________ microns.

< 0.1
< 3
> 3
< 1

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Process Control and Instrumentation
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.

250
1000
750
500

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Process Control and Instrumentation
The transfer function for a P-D controller is

Kc τD s
Kc(1+τD s)
Kc(1 +1/τD s)
Kc/τD s

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Process Control and Instrumentation
__________ temperature scale assigns 0° to the 'ice point' and 80° to the 'steam point'

Reumur
Farenhite
Rankine
Celcius

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

None of these
Ruth
Nyquist
Mikhalov

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