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Process Control and Instrumentation

Process Control and Instrumentation
In a single tank system, the transfer function of level to inlet flow rate is

1/TS
R/TS
L(TS + l)
R/(TS + 1)

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Process Control and Instrumentation
The level of a liquid under pressure can be determined using

Differential pressure manometer
Diaphragm box system
Air-trap system
Bubbler system

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Process Control and Instrumentation
Strain gage pressure transducers are used to measure __________ pressures.

Absolute as well as differential
Gage as well as vacuum
Both A & B Here
Neither A nor B

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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
Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is

Chromel-alumel
Platinum-rhodium
Iron-constantan
Platinum-platinum+rhyodium

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Process Control and Instrumentation
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.

250
350
550
700

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