11A heat exchanger in which hot and cold fluids flow in opposite directions is:AParallel-flowBCounter-flowCCross-flowDRegeneratorView AnswerDiscussWorkspaceReportSaveEasy
12Kirchhoff's law of radiation states that, at equilibrium:AEmissivity is zeroBTransmissivity is maximumCEmissivity equals absorptivityDReflectivity equals oneView AnswerDiscussWorkspaceReportSaveEasy
13Newton's law of cooling relates to:ARadiationBConductionCConvectionDEvaporationView AnswerDiscussWorkspaceReportSaveEasy
14Which has the highest thermal conductivity?ASilverBSteelCAirDWaterView AnswerDiscussWorkspaceReportSaveEasy
15Natural convection correlations typically involve the:AMach numberBReynolds number onlyCWeber numberDGrashof (or Rayleigh) and Prandtl numbersView AnswerDiscussWorkspaceReportSaveEasy