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Process Control and Instrumentation

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

D³
D²
D
D⁴

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Process Control and Instrumentation
Thermal conductivity measurement is used for the determination of

CO₂ percentage in the flue gas
O₂ percentage in the flue gas
Specific gravity of petrofuels
Composition of an alloy

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Process Control and Instrumentation
Out of the following themocouple wire insulating material, the highest temperature rating is for

Teflon
Asbestos
Fibre glass
Ceramic fibre

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Process Control and Instrumentation
Thermocouple is suitable for measuring

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

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Process Control and Instrumentation
Working principle of radiation pyrometer is based on the

Wien's law
Stafan-Boltzman law
Kirchoffs law
Seebeck effect

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Process Control and Instrumentation
Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.

- 51 and 439
- 39 and 350
- 79 and 395
- 10 and 425

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