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Process Control and Instrumentation

Process Control and Instrumentation
Positioning controllers are used for

Temperature changes
High loads
Low loads
Flow rate changes

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Process Control and Instrumentation
Thermistors are made of

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

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Process Control and Instrumentation
When the damping co-efficient (ξ) is unity, the system is

Critically damped
Underdamped
Highly fluctuating
Overdamped

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Process Control and Instrumentation
Pick out the one which is a first order instrument.

Bare metallic thermometer
Mercury in glass thermometer (without any covering or air gap)
Bare vapor pressure thermometer
All of these

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

Mercury in glass
Bimetallic
Constant volume gas
Vapor pressure

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Process Control and Instrumentation
Flow rate of a river is measured by a/an

Vane meter
Kennison nozzle
Open weir
Pitot tube

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