Given below are two statements: Statement (I): The heat transfer coefficient for air in free convection varies between 5 to 30 W/m 2 ·K. Statement (II): The heat transfer coefficient of steam during condensation lies between 5000 to 110000 W/m 2 ·K. In light of the above statements, choose the most appropriate answer from the options given below.

Question

cdquestions Admin · Accepted Answer

Statement I is correct as the heat transfer coefficient for air in free convection generally lies in the range of 5 to 30 W/m².K Statement II is also correct as the heat transfer coefficient of steam during condensation typically ranges between 5000 and 110000 W/m².K

Answer

Both Statement (I) and Statement (II) are correct

Answer

Both Statement (I) and Statement (II) are incorrect.

Answer

Statement (I) is correct but Statement (II) is incorrect.

Answer

Statement (I) is incorrect but Statement (II) is correct.

LIST I	LIST II
A. Nusselt Number	I. \( \mu C_p / k_f \) (where \( k_f \) is thermal conductivity of fluid)
B. Biot Number	II. \( hL / k_s \) (where \( k_s \) is thermal conductivity of solid)
C. Prandtl Number	III. \( h / \rho C_p \)
D. Stanton Number	IV. \( hL / k_f \) (where \( k_f \) is thermal conductivity of fluid)

List I (Dimensionless Quantity)	List II (Application)
(A) Number of transfer units	(I) Recuperative type heat exchangers
(B) Periodic flow heat	(II) Regenerative type heat exchangers
(C) Chemical additive	(III) A measure of heat exchanger size
(D) Deposition heat exchanger	(IV) Prolongs dropwise condensation surface
	(V) Fouling factor

Show Hint

The Correct Option is A

Solution and Explanation

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