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MMLU-Pro / 12016 / Air at a velocity of 10 ft/sec flows through a wide duct with an innerwall…

Problem

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question

Air at a velocity of 10 ft/sec flows through a wide duct with an innerwall temperature of 1,200°F. A thermocouple of diameter1/25 in and emissivity 0.5, is placed in the duct, normalto the airstream. The thermocouple indicates a temperatureof 1,400°F Find the true value of the air temperature. For calculating theconvectionbetween the thermocoupleand the air, take theNusseltnumber as Nu = 0.8 Re^0.38, andthe diameter of the thermocouple as the characteristic lineardimension. Also, the values of k and \mu are to be taken atthe mean film temperature. If the air velocity is doubled, whatwould be the approximate reading of the thermocouple ?

category

engineering

options

  1. 1,522°F and 1,400°F
  2. 1,450°F and 1,400°F
  3. 1,500°F and 1,400°F
  4. 1,550°F and 1,389°F
  5. 1,522°F and 1,380°F
  6. 1,522°F and 1,419°F
  7. 1,500°F and 1,419°F
  8. 1,600°F and 1,450°F
  9. 1,570°F and 1,460°F
  10. 1,480°F and 1,430°F

src

stemez-HeatTransfer

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