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Process Control and Instrumentation

Process Control and Instrumentation
Thermocouple is suitable for measuring

Both high and low temperatures
Liquid temperatures only
Very high temperatures only
Very low temperatures only

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Process Control and Instrumentation
Process degree of freedom indicates __________ number of controllers to be used.

The minimum
Both maximum and the minimum
The maximum
Nothing about the

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Process Control and Instrumentation
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is

Iron-constantan
Chromel-alumel
None of these
Platinum-platinum+rhodium

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

Radiation pyrometer
Mercury thermometer
Thermocouple
Bimetallic thermometer

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Process Control and Instrumentation
A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.

-80.9
-11.9
-60.9
-38.9

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Process Control and Instrumentation
Thermocouple in a thermal well behaves as a true

Second order system (overdamped)
Multiple first order system
Second order system (underdamped)
First order system

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