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Process Control and Instrumentation

Process Control and Instrumentation
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Approaches 180° asymptotically
Is 120°
Is 30°
Is 90° at the most

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Process Control and Instrumentation
Platinum resistance thermometer is the international standard for temperature measurement between

13.81°K to 903.9°K
Neither A nor B
Both A and B
Triple point of hydrogen and freezing point of antimony

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Process Control and Instrumentation
The open loop transfer function of a control system is KR/(1 + TS) . This represents

Dead time system
A first order system
A second order system
A first order time lag

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Process Control and Instrumentation
Transfer function of transportation lag is

1/(TS + 1)
ETS
None of these
E-TS

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Process Control and Instrumentation
Which of the following is not the triple point of water?

32°R
32°F
273°K
492°R

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Process Control and Instrumentation
The inverse Laplace transform of the function f(s) = 1/S(1 + S) is

1 - et
1 - e-t
1 + e-t
1 + et

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