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Process Control and Instrumentation

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

13
3
0.1
29

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Process Control and Instrumentation
What is the Laplace transform of sin t ?

S/(s² - 1)
S/(s² + 1)
1/(s² - 1)
1/(s² + 1)

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

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Process Control and Instrumentation
The unit step response of the transfer function 1/(s² + 2s + 3)

Has a non-zero slope at the origin
Is overdamped
Is unstable
Has a damped oscillatory characteristics

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Process Control and Instrumentation
A pyranometer is an instrument used for measuring the

Global radiation
Bright sunshine period
Beam radiation
None of these

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Process Control and Instrumentation
Out of the following themocouple wire insulating material, the highest temperature rating is for

Asbestos
Ceramic fibre
Teflon
Fibre glass

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