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Process Control and Instrumentation

Process Control and Instrumentation
__________ controller has the maximum stabilising time.

P
PI
PID
PD

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Process Control and Instrumentation
Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an

Radiation pyrometer
Chromel-alumel thermocouple
Optical pyrometer
Either B or C

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Process Control and Instrumentation
Which is the most suitable instrument for measuring pressure below 3 microns?

Alphatron
Bourdon guage
Mcleoid gauge
Ionisation gauge

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Process Control and Instrumentation
E.m.f. generated by thermocouples is of the order of

Volts
Millivolts
Kilo volts
Microvolts

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

Temperature changes
Flow rate changes
None of these
Low loads

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Process Control and Instrumentation
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

High thermal conductivity
Large area but small mass
Small specific heat
All of these

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