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Process Control and Instrumentation

Process Control and Instrumentation
A mercury barometer measures the __________ pressure.

Gauge
Vacuum
Atmospheric
Absolute

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Process Control and Instrumentation
Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a

Vapor pressure thermometer
Thermocouple
Mercury in glass thermometer
Reistance thermometer

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Process Control and Instrumentation
Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C?

Photoelectric pyrometer
Thermocouples
Radiation pyrometer
Optical pyrometer

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Process Control and Instrumentation
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

Integral control action is introduced
Derivative control action is introduced
Kc is reduced
Kc is increased

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Process Control and Instrumentation
Which is the most suitable instrument for measuring pressure below 3 microns?

Ionisation gauge
Mcleoid gauge
Alphatron
Bourdon guage

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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
D
D³
D²

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