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Thermal - Part 3
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Questions on Radiation and Natural Convection.

IRSME. Graduated in Mechanical engineering. Secured AIR 1 in ESE 2017. Believes in Quality Education for all.

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Xander Blessed
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1. Solution and Analysis of One Mark Questions (In English) GATEa By: Lohit Kumar Yadav GRADUATE APTITUDE TEST IN ENGINEERING Afternoon Session

2. About me: Secured AIR 1 in ESE 2017 Appeared for ISRO, BARC, BEL, BPCL, IOCL Interviews 2 years professional experience AFSB Mysore, 2014 Educator on Unacademy since December, 2017 Hobbies: Reading Fictional Novels, Cooking, Playing Piano

3. Sphere i with a diameter of 0.1 m is completely enclosed by another sphere 2 of diameter o.4 m. The view factor F is (a) o.25 (b) 0.5 (c) o.0625 12 1.0

4. Given data 4 2 12

5. A thin vertical flat plate of height L, and infinite width perpendicular to the plane of the figure, is losing heat to the surroundings by natural convection. The temperatures of the plate and the surroundings and the properties of the surrounding fluid, are constant. The relationship between the average Nusselt and Rayleigh numbers is given as Nu K Ra4, where K is a constant. The length scales for Nusselt and Rayleigh numbers are the height of the plate. The height of the plate is increased to 16L keeping all other factors constant.

6. If the average heat transfer coefficient for the first plate is hi and that for the second plate is h2, the value of the ratio hi/h2 is Vertical Plate g-9.8 m/s2

7. ara

8. , 3 STL 2. 3

9. Li 2 2. n2