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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 mm800mm) 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:
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-
2-
3-
4-
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-
2-
3-
4-
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