Heat Transfer (3151909) MCQ

MCQs of Heat Transfer From Extended Surfaces

MCQ No - 1

The extended surface used for the enhancement of heat dissipation is

(A)

Convective coefficient

(B)

Fourier number

(C)

Fin

(D)

No finned surface


C
MCQ No - 2

A steel rod (k = 30 W/m degree) 1 cm in diameter and 5 cm long protrudes from a wall which is maintained at 10 degree Celsius. The rod is insulated at its tip and is exposed to an environment with h = 50 W/m2 degree and t a = 30 degree Celsius. Calculate the fin efficiency

(A)

56.57%

(B)

 66.57%

(C)

76.57%

(D)

86.57%


B
MCQ No - 3

In order to achieve maximum heat dissipation, the fin should be designed in such a way that has a

(A)

The maximum lateral surface towards the tip side of the fin

(B)

The minimum lateral surface near the centerline

(C)

The maximum lateral surface at the root side of the fin

(D)

The maximum lateral surface near the center of the fin


C
MCQ No - 4

A steel rod (k = 30 W/m degree) 1 cm in diameter and 5 cm long protrudes from a wall which is maintained at 10 degree Celsius. The rod is insulated at its tip and is exposed to an environment with h = 50 W/m2 degree and T a = 30 degree Celsius. Calculate the rate of heat dissipation

(A)

2.658 W

(B)

3.658 W

(C)

4.658 W

(D)

5.658 W


B
MCQ No - 5

On a heat transfer surface, fins are provided to

(A)

Increase turbulence in flow for enhancing heat transfer

(B)

Increase temperature gradient so as to enhance heat transfer

(C)

Pressure drop of the fluid should be minimized

(D)

Surface area is maximum to promote the rate of heat transfer


D