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Process Control and Instrumentation

Process Control and Instrumentation
What is the dynamic error in a critically damped second order instrument for a ramp input (AT)?

1.5 AT
√AT
2 AT
0.5 AT

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

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

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Process Control and Instrumentation
Measurement of sub-zero Celcius temperature in industry is done most commonly by

Resistance thermometers
Thermocouples
Bi-metallic thermometers
Gas thermometers

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Process Control and Instrumentation
In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.

Load
None of these
Manipulated
Controlled

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Process Control and Instrumentation
Thermistors are used in __________ devices.

Temperature compensating
Voltage measuring
Temperature measuring
Both B & C

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

1/RC
R + C
R - C
RC

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