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Process Control and Instrumentation

Process Control and Instrumentation
The frequency response of a first order system, has a phase shift with lower and upper bounds given by

-π/2, π/2
- ∞, π/2
-π/2, 0
0, π/2

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Process Control and Instrumentation
The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

D
D⁴
D²
D³

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Process Control and Instrumentation
Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively

- 273° & 80°
0° & 80°
32° & 80°
32° & 460°

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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)?

0.5 AT
1.5 AT
2 AT
√AT

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Process Control and Instrumentation
Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.

< 0
> 800
< 100
> 0

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Process Control and Instrumentation
Which of the following measurements can be made by the measurement of emf?

Composition of complex ions
PH value
Degree of hydrolysis
All of these

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