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Process Control and Instrumentation

Process Control and Instrumentation
E.m.f. generated by thermocouples is of the order of

Millivolts
Microvolts
Kilo volts
Volts

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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)?

1.5 AT
2 AT
√AT
0.5 AT

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Process Control and Instrumentation
A simple pitot tube measures the

Static pressure
Point velocity
Average velocity
Maximum velocity

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Process Control and Instrumentation
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.

250
500
1000
750

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Process Control and Instrumentation
Nichol's chart deals with

Frequency response values of controllers
Closed loop values vs. open loop values
R. vs. phase lag of second order
R. vs. phase lag of first order

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Process Control and Instrumentation
Which of the following is a desirable characteristic of an instrument?

High drift
Poor reproducibility
High measuring lag
High fidelity

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