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Process Control and Instrumentation

Process Control and Instrumentation
pH meter has

No cell
One cell
Two cells
Three cells

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Process Control and Instrumentation
An amplitude ratio of 0.1 corresponds to __________ decibels.

20
-10
-20
10

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Process Control and Instrumentation
Change of angle of refraction with composition comprises the working principle of a

Refractrometer
Polarimeter
Spectrometer
Polarograph

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Process Control and Instrumentation
Continuous measurement of moisture content of paper in paper industry is done by measuring the

Electrical resistance through the paper
None of these
Thermal conductivity through the paper
Magnetic susceptibility

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Process Control and Instrumentation
Pirani gauge is used for the measurement of

Very high pressure
High vacuum
Liquid level at atmospheric pressure
Liquid level under pressure

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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

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

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