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Process Control and Instrumentation

Process Control and Instrumentation
Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm³.

50
10
1
100

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Process Control and Instrumentation
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

Either A, B or C
Iron-constantan
Platinum-platinum+rhodium
Chromel-alumel

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Process Control and Instrumentation
The __________ of a vapor pressure thermometer is a primary element.

Pointer
Bourdon tube
None of these
Bulb

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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
Temperature difference
None of these

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Process Control and Instrumentation
A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in

Current
Flux density
Light intensity
Voltage

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Process Control and Instrumentation
Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

Thomson effect
Joule heating effect
Peltier effect
Seebeck effect

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