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Process Control and Instrumentation

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

Transportation lag
First order system
None of these
Second order system

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Process Control and Instrumentation
Response of a linear control system for a change in set point is called

Transient response
Servo problem
Frequency response
Regulator problem

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Process Control and Instrumentation
A stable system is the one

For which the output response is bounded for all bounded input
Which exhibits an unbounded response to a bounded input
None of these
Which satisfies the conditions for a servo problem

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Process Control and Instrumentation
A sinusoidal variation in the input passing through a linear first order system

Gets amplified (magnitude increases)
Becomes less oscillatory (frequency decreases)
Becomes more oscillatory (frequency increases)
Gets attenuated (magnitude decreases)

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Process Control and Instrumentation
Which thermocouple can be used to measure a temperature of around 1400°C ?

Platinum-platinum+rhodium
Aluminium-chromel
None of these
Copper-constantan

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

Reproducibility
Dead zone
Time lag
Static error

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