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Process Control and Instrumentation

Process Control and Instrumentation
Bimetal strips are not used in

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

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Process Control and Instrumentation
Volumetric expansion is the working principle of the __________ thermometers.

Vapor pressure
Constant volume gas
Bimetallic
Mercury in glass

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Process Control and Instrumentation
Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.

0.0001
0.001
0.1
0.01

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Process Control and Instrumentation
A sinusoidal variation in the input passing through a linear first order system

Becomes less oscillatory (frequency decreases)
Becomes more oscillatory (frequency increases)
Gets amplified (magnitude increases)
Gets attenuated (magnitude decreases)

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Process Control and Instrumentation
Turbine flow meters are suitable for

Very limited flow ranges
Both B and C
Aerospace and in air borne applications
Cryogenic flow measurements

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Process Control and Instrumentation
Dead zone in an instrument must be less than __________ percent of the scale.

0.2
8
1.5
4

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