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Process Control and Instrumentation

Process Control and Instrumentation
Continuous measurement of moisture in paper is done by

Weighing
Sling psychrometer
High resistance Wheatstone's bridge circuit
Hair-hygrometer

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Process Control and Instrumentation
Dilatometer is used to measure

Deflection
Stress
Contraction/expansion due to changes in temperature
Strain

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

PD
PI
PID
P

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

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

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Process Control and Instrumentation
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?

Chromel
Invar
Nickel
Brass

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Process Control and Instrumentation
The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

Pressure
All of these
Viscosity
Volume

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