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Process Control and Instrumentation

Process Control and Instrumentation
A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is

-180°
-45°
45°
-90°

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Process Control and Instrumentation
Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.

Fahrenheit
Reaumer
Centigrade
Kelvin

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Process Control and Instrumentation
Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a

Thermocouple
Mercury in glass thermometer
Reistance thermometer
Vapor pressure thermometer

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Process Control and Instrumentation
In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.

Manipulated
Load
None of these
Controlled

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Process Control and Instrumentation
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?

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

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Process Control and Instrumentation
Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an

Orificemeter
Venturimeter
Magnetic flow meter
Hot wire anemometer

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