Heat Transfer Questions

Q.  Gray body can emits radiation

a. at higher rate than the black body
b. at lower rate than the black body
c. at equal rate than the black body
d. cannot predict


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No explanation is available for this question!
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MCQs:  When a composite wall of three layers in series having thermal resistances R1, R2 and R3 respectively, the heat transfer takes place normal to the surface of the layers. How is the total thermal resistance of the composite system calculated?
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MCQs:  Why is the Buckingham π–Theorem used?
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