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Process Control and Instrumentation

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

Polarimeter
Spectrometer
Polarograph
Refractrometer

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Process Control and Instrumentation
__________ thermometer can not measure sub-zero (< 0° C) temperature,

Bimetallic
Mercury in glass
Resistance
Vapor pressure

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Process Control and Instrumentation
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

Derivative control action is introduced
Kc is reduced
Integral control action is introduced
Kc is increased

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Process Control and Instrumentation
Which thermocouple can be used to measure a temperature of around 1400°C ?

None of these
Platinum-platinum+rhodium
Aluminium-chromel
Copper-constantan

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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?

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

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Process Control and Instrumentation
Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm³.

50
100
10
1

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