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Process Control and Instrumentation

Process Control and Instrumentation
Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called

Insulators
Conductors
Dielectrics
Semi conductors

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Process Control and Instrumentation
Bimetal strips are not used in

Bimetallic thermometers
Thermostats
Thermocouples
Relays for opening & closing of electrical circuits

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Process Control and Instrumentation
Composition of natural gas is determined by the

Mass spectrometer
Chromatograph
Haldane apparatus
Both B and C

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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.

25
100
75

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

Thermocouple
Vapor pressure thermometer
Mercury in glass thermometer
Reistance thermometer

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Process Control and Instrumentation
The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches

1
-1
∞

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