Engine : General Subjects - 2068/1128
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| Suppose that a standard bourdon tube pressure gauge has a scale of 0 to 1000 psig. If the accuracy of the gauge is plus or minus .5% of the span, what would the range of measured pressure be if the gauge indicates 690 psig? |
| A) 640 to 740 psig |
| B) 680 to 700 psig |
| C) 685 to 695 psig |
| D) 686.55 to 693.45 psig |
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| Comments |
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| .5% = .005, so the Answer should be D) 636.55 to 693.45 Unless I read wrong? |
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| .005 * 1,000 = 5.. So +/- 5 from 690? That's my guess, but I'm not an engineer. |
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| Ah, yes. I re-read the question (the problem was my reading comprehension. Not the problem.) Thanks, Shawn. |
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| Answer should be D) 686.55 to 693.45 as we are referring/basing to 690 PSIG and not the 1000 psig range of the gauge. correct me if am wrong. |
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| It is actually C, because it is looking at the .5% from the span (1000 psig) |
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| Answer is 685 to 695, 0.5% = 0.005, 0.005 * 1000(total span) = 5, +/- 690 is 685-690 |
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| says on the box or gauge + or - 5PSI or the % :), 690 is irrelevant here. not a trick question this applies to every gauge you read will have a + or - for the gauge not just the reading you want. |