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Process Control and Instrumentation

Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

Τds + 1
E-τds
1/(τds + 1)
Eτds

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

√AT
0.5 AT
1.5 AT
2 AT

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Process Control and Instrumentation
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?

29
13
0.1
3

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Process Control and Instrumentation
Which of the following flow-metering instru-ments is an areameter?

Rotameter
Pitot tube
Hot wire anemometer
Venturimeter

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Process Control and Instrumentation
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?

Radiation/infrared pyrometer
Thermo electric pyrometer
Filled system thermometer
Mercury in glass thermometer

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Process Control and Instrumentation
Which of the following is the dynamic characteristics of an instrument?

Fidelity
Reproducibility
Sensitivity
Dead zone

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