Which of the following is not true for a Carnot cycle?
A) It is a fictitious cycle
B) Heat transfer occurs across small temperature differences
C) No friction or sudden expansion is allowed
D) No cycle can exceed its efficiency
B) Heat transfer occurs across small temperature differences
Heat transfer must occur across an infinitesimal temperature difference dT. “Small” is much larger
than dT. If such a cycle is attempted in a lab, the temperature difference across which heat is
transferred would be made very small. The efficiency of such a cycle would only approach the
efficiency of a Carnot cycle.
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The R-value of a 1-in.-thick extruded polystyrene board is 5.0. If the R-value of a 1-in.-thick brick wall is 0.2, how thick should the brick wall be to equal the R-value of 1-in.-thick extruded polystyrene?
A) 2.5 in. B) 50 in. C) 5 in. D) 10 in. E) None of the above
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Refer to the girder brace in Drawing Number W11784S R1.
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Answer the following statement true (T) or false (F)