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Process Control and Instrumentation

Process Control and Instrumentation
Continuous measurement of specific gravity of a liquid is done by

Contact-type electric indicators
Both A and C
Hydrometer
Displacement meter

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Process Control and Instrumentation
0n-off control which is a special case of proportional control, has a band width of about __________ percent.

75
25
100

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Process Control and Instrumentation
Radiation pyrometers as compared to thermocouples

Can't measure the temperature of moving objects
Has a slower speed of response
Can measure higher temperature
Is more affected by corrosive atmosphere

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Process Control and Instrumentation
Alphatron measures pressure __________ microns.

< 3
< 0.1
< 1
> 3

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Process Control and Instrumentation
The operation of a rotameter is based on

Rotation of a turbine
Pressure drop across a nozzle
Variable flow area
Pressure at a stagnation point

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Process Control and Instrumentation
Reset rate is the another term used for __________ time.

Dead
Derivative
None of these
Integral

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