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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

D⁴
D²
D
D³

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Process Control and Instrumentation
Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?

Mercury in glass thermometer
Vapor pressure thermometer
Platinum resistance thermometer
Radiation pyrometer

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Process Control and Instrumentation
Liquid column manometers are used for measuring the pressure __________ kgf/cm² .

> 2(gage)
< atmospheric
< 3 (gage)
< 10 (gage)

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Process Control and Instrumentation
Continuous measurement of moisture in paper is done by

Hair-hygrometer
Weighing
High resistance Wheatstone's bridge circuit
Sling psychrometer

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Process Control and Instrumentation
Composition of alloys can be determined by

Refractrometer
Chromatograph
Polarograph
None of these

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Process Control and Instrumentation
Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

Inconel
Nichrome
Vycor (a glass)
Steel

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