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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

D
D⁴
D³
D²

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Process Control and Instrumentation
Mercury thermometer can be used to measure the temperature upto __________ °C.

350
750
250
100

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Process Control and Instrumentation
A typical example of a physical system with under damped characteristic is a

Spring loaded diaphragm valve
U-tube manometer
CSTR with first order reaction
Thermocouple kept immersed in a liquid filled thermowell

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Process Control and Instrumentation
Humidity of air can be determined by a

Sling psychrometer
Mass spectrometer
Polarimeter
Chromatograph

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

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

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Process Control and Instrumentation
The time constant of a first order process with resistance R and capacitance C is

R - C
RC
R + C
1/RC

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