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Process Control and Instrumentation

Process Control and Instrumentation
The term analogous to the electrical current in a thermal system is the

Heat content in the system
Temperature difference
None of these
Heat flow rate

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Process Control and Instrumentation
The function of a transducer is to

Codify/decodify the input signal
Modify the input signal
Amplify the input signal
Convert the primary signal into a more useful quantity, usually an electric impulse

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Process Control and Instrumentation
Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?

Platinum resistance thermometer
Mercury in glass thermometer
Radiation pyrometer
Vapor pressure thermometer

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Process Control and Instrumentation
The operation of a rotameter is based on

Variable flow area
Pressure at a stagnation point
Pressure drop across a nozzle
Rotation of a turbine

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Process Control and Instrumentation
Which of the following is never used as an element of industrial resistance thermometer?

Nickel
Copper
30% iron + 70% nickel
Lead

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Process Control and Instrumentation
Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature

Embrittlement of iron occurs
Rusting of iron takes place
Both B and C Here
Emf produced is very low of the order of microvolt

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