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GATE 2020: Heat Transfer Rapid Quiz

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Question 1

A cylindrical body of 30 cm diameter, 170 cm long having a uniform temperature of 75 °C and thermal conductivity k is 6.08 W/m-K is placed in a surrounding of 20 °C with a heat transfer coefficient to of 8 W/m²-K. The Biot number is ____________.

Question 2

A coolant fluid at 30 °C flows over a heated flat plate maintained at a constant temperature of 110 °C. The boundary layer temperature distribution at a given location on the plate may be approximated as

where y (in m) is the distance normal to the plate and T is in °C. If thermal conductivity of the fluid is 1.0 W/m-K, the local convective heat transfer coefficient at that location will be ____________ W/m²-K.

Question 3

Sun’s surface at 6000 K emits radiation at a wavelength of 0.25 µ. a furnace at 500 °C will emit through a small opening radiation at a wavelength of nearly

Question 4

Steam is generating in a steam generator at 100

by a hot fluid which enter at 180

and exist at 120

. The mass flow rate of the hot fluid is 0.5 kg/s and its specific heat is 4.186 KJ/KgK. If the overall heat transfer coefficient is 2500 W/m2K. Assuming entire heat from hot fluid is useful for heating. Find the heat transfer area ( in m2) for the heat exchanger used for the purpose of heat transfer.

Question 5

The main trunk duct of an air conditioning system is rectangular in cross-section (400 mm $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image001.png$ 800mm) and has air at atmospheric pressure and at 20⁰C temperature flowing with a velocity of 7 m/s. estimate the heat leaskage (W) per meter length per unit temperature difference. Relevant physical properties of air are:
$Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image054.png$

Question 6

Match list-I (Surface with orientations) with List-II (Equivalent emissivity) and select the correct answer using the codes given below the lists :
List-I
A- Infinite parallel planes
B- Body 1 completely enclosed by body 2 but body 1 is very small
C- Radiation exchange between two small gray bodies.
D- Two concentric cylinders with large lengths.
List-II
1- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image024.png$
2- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image025.png$
3- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image026.png$
4- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image027.png$

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ESE & GATE ME Heat Transfer

Sep 3ESE & GATE ME