Instrumentation Academy

# Instrumentation Interview Challenge #2 – Answer

Correct Answer: C – It moves to 100% open.

What is a Fail-Safe Position?

A fail-safe position is the position a control valve automatically moves to when the instrument air supply or power is lost. This position is selected during the design stage to keep the process in the safest possible condition.

What does Fail Open (FO) mean?

A Fail Open (FO) valve is designed to move to its fully open position whenever the instrument air supply fails.

In this question, when the air supply is completely lost, the actuator spring drives the valve to its fail-safe position, which is 100% open.

Key Point:
Fail Open describes what the valve does after an air failure. It does not describe the valve's normal operating position.

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1 day ago | [YT] | 24

Instrumentation Academy

Instrumentation Interview Challenge #2

Can you get this one right?

Comment your answer A, B, C, or D below — and if you can, explain why.

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Take our FREE Instrumentation Knowledge Test and see how well you score!

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1 week ago | [YT] | 81

Instrumentation Academy

How strong is your Instrumentation knowledge?

Take our FREE Instrumentation Knowledge Test and challenge yourself with 30 questions covering key instrumentation concepts.

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Take the FREE Test here: courses.instrumentationacademy.com/learn


After completing the test, comment your score below!

2 weeks ago | [YT] | 18

Instrumentation Academy

The correct answer is ✅ B) 12 mA

Why?

A standard pressure transmitter calibrated from 0–10 bar has an output of 4–20 mA, not 0–20 mA.

✅ When the transmitter input is 0 bar, the output is 4 mA (Live Zero).
✅ When the transmitter input is 10 bar, the output is 20 mA.
✅ An input of 5 bar represents 50% of the calibrated range.

Therefore,

Output = 4 mA + (50% × 16 mA)
= 4 mA + 8 mA
= ✅ 12 mA
So,


⚠️ Common Mistake:
Many people selected 10 mA because they assumed the transmitter outputs 0–20 mA. In reality, industrial transmitters use a 4–20 mA live zero, so the correct answer is 12 mA.

Congratulations to everyone who answered correctly!


More instrumentation interview challenges are coming soon. Stay tuned!

2 weeks ago | [YT] | 59

Instrumentation Academy

Can you solve this Instrumentation Question?

Comment your answer (A, B, C, or D) along with your reasoning.

Ready for a bigger challenge?
Take our FREE Instrumentation Knowledge Test:
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2 weeks ago (edited) | [YT] | 68

Instrumentation Academy

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3 weeks ago | [YT] | 62

Instrumentation Academy

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10 months ago (edited) | [YT] | 14

Instrumentation Academy

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1 year ago | [YT] | 18