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Process Control and Instrumentation

Process Control and Instrumentation
Thermistors are made of

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

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Process Control and Instrumentation
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?

29
3
13
0.1

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Process Control and Instrumentation
If response of a control system is to be free of offset and oscillation, the most suitable controller is

Proportional-derivative(PD)controller
Proportional controller
Proportional-integral (PI) controller
Proportional integral-derivative (PID) controller

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Process Control and Instrumentation
Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by __________ effect.

None of these
Thomson
Seebeck
Peltier

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

Load
None of these
Controlled
Manipulated

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Process Control and Instrumentation
High temperature of around 2000°C of incandescent gas mantles is measured by a/an

None of these Here
Optical pyrometer
Radiation pyrometer
Specially designed thermocouple

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