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← GATE CH 2020 (with Solutions).pdf

Q53

FAILNATpage 29holdREVIEW_LOW_CONFIDENCEP2UNREVIEWED
type=NAT · page=29–30 · marks=2 · content_conf=0.7999999999999999 · math_conf=0.791

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Source / evidence

file: GATE CH 2020 (with Solutions).pdf
pages: 29–30

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Extracted53 / 67

A fluid is heated from 400C40^0 C to 600C60^0 C
in a countercurrent, double pipe heat exchanger. Hot fluid enters at
1000C100^0 C and exits at 700C70^0 C .The log mean temperature difference, i.e. LMTD (in ⁰C⁰ C ), is _______(round off to 2 decimal places).

Options

none

Answer

34.76

Solution

600C60^0C
1000C100^0C
700C0700C70^0C_070^0C
100C100C
600C60^0C
40C400C40C400C
L/mathrmMTD=(100−60)0−/frac(70−40)(/ln(/frac(100−60)(70−40)))L_{/mathrm{MTD}} = (100-60)^0-/frac{(70-40)}{(/ln(/frac{(100-60)}{(70-40)}))}
L/mathrmMTD=34.760CL_{/mathrm{MTD}} = 34.76^0C

Why review

Category: REVIEW_LOW_CONFIDENCE · Priority: P2 · Disposition: extraction_defect

Extractor validation_status=low_confidence.

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Human review

state=UNREVIEWED · resolution=— · trust=UNRESOLVED · WAVE-12 priority=P2
Review actions

Writes a viewer overlay only. Never converts verification REVIEW into automatic PASS.

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Provenance status

Source PDF: GATE CH 2020 (with Solutions).pdf
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Equations:none

Dimensions

  • structurePASS
  • question_textFAIL
  • optionsPASS
  • answerPASS
  • solutionPASS
  • mathPASS
  • cross_entityPASS

Issues

  • operator_set_changed_raw_vs_derived
  • digit_sequence_changed_raw_vs_derived