**Sale ends today**Get 30% off any course (excluding packages)

**Ends in --- --- ---**

Anthony,

I suspect your question may be based on something specific you've seen in course material. Can you link us to a video and time mark to review what you're asking about?

Right before that Andre was talking about standard conditions that assumed 1 Bar of atmospheric pressure or 14.7 psi...

But when an ECU makes air mass calculations it makes adjustment based on actual air pressure in the area

Right, but how are you supposed to calculate the answer with only knowing air pressure of 14.7?

What is the mass flow at an air pressure of 14.7 psi?

SELECT ONE ANSWER

A. 107 kg/min

B. 10.7 lb/min

C. 1.07 lb/hour

D. 10.7 lb/sec

My post above is literally the whole question as it reads.

Ok, so given the question above. What's your answer and show your work?

The question would have been better phrased as 'Which value could be a valid Mass Flow at 14.7 psi?"

Yes, that's a bit confusing indeed...

This question was a follow up to the question right before it.

The answer to the prior question is the volume flow.

To get mass flow you multiply volume flow by density.

Multiplying that volume flow from the prior question, by the density value taught in the course for use at standard pressure (14.7 psi mentioned in this question), gives you the correct answer to this question.

Out of context for the folks here who weren't taking the test at the moment, it does seem like volume flow info is lacking, and I can understand why Shota tried to narrow it down based on units, but that's not necessary. All info to do the calculation has been given, but part of the info was in the prior question.

I've proposed an update to the question to make this more obvious. Thank you for your feedback.

Ah thanks. I don't recall if it was random back when I took that course or not.

It's the weekend in NZ so I'll check in with the crew Monday to see what they think.