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Process Control and Instrumentation

Process Control and Instrumentation
Positioning controllers are used for

Flow rate changes
High loads
Temperature changes
Low loads

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Process Control and Instrumentation
Radiation pyrometers as compared to thermocouples

Can't measure the temperature of moving objects
Is more affected by corrosive atmosphere
Can measure higher temperature
Has a slower speed of response

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Process Control and Instrumentation
Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?

Mercury in glass thermometer
Radiation pyrometer
Vapor pressure thermometer
Platinum resistance thermometer

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

Rotameter
Pitot tube
Venturimeter
Hot wire anemometer

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Process Control and Instrumentation
A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.

Routh stability
Nyquist
Bode stability
None of these

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Process Control and Instrumentation
The amplitude ratio for the sinusoidal response of a __________ is 1.

Second order system
First order system
None of these
Transportation lag

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