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Process Control and Instrumentation

Process Control and Instrumentation
Liquid discharge from a tank or reservoir can not be measured by

Weirs
Notches
Orificemeters
Mouthpieces

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Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

A metal powder or graphite
Mercury
Air
Oil

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Process Control and Instrumentation
When a bare thermocouple is covered by a protective sheath, the response becomes

Faster and oscillatory
Faster and non-oscillatory
Slower and oscillatory
Slower and non-oscillatory

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Process Control and Instrumentation
Use of I-control along with P-control facilitates

None of these
Reduction of offset
Reduction of stability time
Elimination of offset

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Process Control and Instrumentation
Temperature of __________ can not be measured by an optical or radiation pyrometer.

Rotary limestone calcination kiln
Hot blast (air) from stoves
Combustion space in boilers
Molten slag flowing out of blast furnace

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Process Control and Instrumentation
Which of the following judges the accuracy of an instrument?

None of these
Dead zone
Drift
Static error

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