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Process Control and Instrumentation

Process Control and Instrumentation
The unit of 'time constant' of a system is the same as that of

None of these
(time)⁻¹
Velocity
Time

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Process Control and Instrumentation
Emf generated in a thermocouple depends on the temperature

Of hot junction only
Difference between cold junction and atmospheric temperature
Of cold junction only
Difference between hot and cold junctions

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Process Control and Instrumentation
The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

D⁴
D³
D
D²

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Process Control and Instrumentation
Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

Radiation pyrometer
Thermocouple
Mercury thermometer
Bimetallic thermometer

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Process Control and Instrumentation
In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.

Manipulated
Controlled
Load
None of these

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Process Control and Instrumentation
The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly

Hyperbolic
Linear
Non-linear
Parabolic

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