Heat Transfer - Study Mode

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[#121] In the free convection regime of pool boiling, the heat flux is proportional to

(A) $$Delta {{ ext{t}}^{frac{1}{2}}}$$

(B) Δt 2

(C) $$Delta {{ ext{t}}^{frac{5}{4}}}$$

(D) Δt

Correct Answer

(C) $$Delta {{ ext{t}}^{frac{5}{4}}}$$

[#122] The average heat transfer co-efficient over the entire length of the plate (h a ) and the local heat transfer co-efficient (h L ), in case of heat transfer over a flat plate in lminar zone is related as

(A) H a = 0.8h L

(B) H a = 2h L

(C) H a = h L

(D) H a = 5h L

Correct Answer

(B) H a = 2h L

[#123] For what value of Prandtl number, $${ ext{St}} = frac{{ ext{f}}}{2}?$$

(A) 1.5

(B) 1

(C) > 1

(D) < 1

Correct Answer

(B) 1

[#124] Prandtl and Reynolds analogy are same, when Prandtl number is

(A) 0.5

(B) 1

(C) > 2

(D) 1.5

Correct Answer

(B) 1

[#125] Calburn analogy is applicable for the value of Prandtl number from

(A) 0.001 to 1

(B) 0.6 to 120

(C) 0.5 to 5

(D) 120 to 400

Correct Answer

(B) 0.6 to 120