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Process Control and Instrumentation

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

Vapor pressure
Mercury in glass
Constant volume gas
Bimetallic

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Process Control and Instrumentation
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is

0.25
0.5
1
1/√2

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Process Control and Instrumentation
The function of a transducer is to

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

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Process Control and Instrumentation
Use of I-control along with P-control facilitates

None of these
Reduction of offset
Reduction of stability time
Elimination of offset

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

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

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

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

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