Monday, July 2, 2012
Instrumentation Common Questions -2
EPC School 2012 Series
I for Instrumentation
Q: What is potential free contact? What is the significance and application of this contact?
Contacts having not potential. E.g. Relay contacts/ field switches contacts. They are used in logic circuits. A potential free contact is usually wired into an electrical circuit. However it must be ensured that the contact ratings are suitable for the service in which it is used.
Read more »I for Instrumentation
Q: What is potential free contact? What is the significance and application of this contact?
Contacts having not potential. E.g. Relay contacts/ field switches contacts. They are used in logic circuits. A potential free contact is usually wired into an electrical circuit. However it must be ensured that the contact ratings are suitable for the service in which it is used.
Labels: common interview instrumentation questions, control, engineering, EPC School, instrument, instrument questions, instrumentation, Interview, interview questions, Questions, Rahul Kapoor, transmitters, valves
Instrumentation Common Questions -1
EPC School 2012 Series
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Q: Why do we use pipelines for transmitters in steam service and tubes in any other service?
A) Pipe as well as tubes can be used for steam line transmitters. However pipe walls being thicker provide more corrosion allowance. B) For steam services, with high temp and pressure needs IBR standard. Max. Working pressure is 153 kg/cm2 at 38 degC for 1/2” O.D tube as per design standard. So tube is not suitable.
Labels: common interview instrumentation questions, common questions, instrument, instrument questions, interview questions, Questions, Rahul Kapoor, reference questions for interview
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