Chemical Engineering - Process Control and Instrumentation - Discussion


Which of the following is an undesirable dynamic characteristic of an instrument ?

[A]. Reproducibility
[B]. Dead zone
[C]. Time lag
[D]. Static error

Answer: Option C


No answer description available for this question.

Rekha said: (Sep 2, 2012)  
What is actual meaning of the dead zone?

Y92 said: (Sep 29, 2012)  
Dead zone is a part of the reactor where there is accumulation of solution and no mixing occurs it is normally due to the sharp ends at the corners.

Sunil Kumar said: (Oct 12, 2012)  
All are static characteristics except time lag or time delay.

Bala said: (Mar 25, 2014)  
For a good instrument time lag should be zero then only we can get the reading as it is that's why it is undesirable.

Sankarvinayaka said: (Aug 7, 2014)  
No mixing occurs it is normally due to sharp ends at the corners.

Rimjhim said: (Oct 7, 2014)  
Dead zone is corresponds to that range of input frequencies for which output does not change even on changing the input(in that particular range only).

Rajan Verma said: (Aug 17, 2016)  
Time delay increases the stability by increasing the PM, so how it could be an undesirable dynamic characteristic?

Mukesh said: (Oct 12, 2016)  
All are static characteristics except time lag or time delay.

Veerendra Yadav said: (Dec 30, 2016)  
Time lag is the main immportent charecterstics of the instrument.

Vivek S. said: (May 2, 2019)  
1)Static characteristics:

- Desirable.
* Accuracy, Repeatability, Reproducibility,
* Sensitivity.

- Undesirable.
* Drift, Dead zone, static error.

2)Dynamic Characteristics:
- Desirable.
*Speed of response, Fidelity.

- Undesirable.
*Time lag, Steady state error.

Ayushi Soni said: (Dec 23, 2020)  
Thank you so much @Vivek S.

It's really helpful.

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