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Process Control and Instrumentation

Process Control and Instrumentation
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

36
54
12
68

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Process Control and Instrumentation
Thermistors are made of

Iron-copper alloys
Metal oxides
Ultra pure metals
Nickel-chromium alloys

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

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

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Process Control and Instrumentation
Composition of alloys can be determined by

None of these
Refractrometer
Polarograph
Chromatograph

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Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

A metal powder or graphite
Mercury
Oil
Air

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Process Control and Instrumentation
Psychrometer determines the

Hygroscopic nature of solids
Humidity of gases
Water of crystallisation
Moisture content of solids

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