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GATE 2023 || Heat Transfer || Evaluation Quiz 10

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Question 1

When one of the fluids in heat exchanger is undergoing to phase change like steam condenser. The effectiveness of counter flow heat exchanger will be given as _____________.

Question 2

What is the value of the shape factor for two infinite parallel surface separated by a distance d ?

Question 3

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- $Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image027.png$

Question 4

The wavelength (in

) for maximum monochromatic excessive power of a body at a temperature of 1200 K will be

Question 5

In a counter flow heat exchanger, water is heated from 30°C to 60°C with flow rate of 2kg/s by an oil having temperature of 110° and 70°C at inlet and outlet respectively and flow rate of 3 kg/s. The specific heats of water and oil are 4.2 KJ/kg-k and 2.1 kJ/kg-K respectively. Find the maximum possible heat transfer (in kW) between the fluids.

Question 6

Solar radiation of 1000 W/m² falls perpendicularly on a grey surface of emissivity 0.6. if the surface temperature is 40 °C and surface emissive power is 500 W/m² the radiosity of that will be

Question 7

A counter flow type air heater has an area of 80 m². The overall heat transfer coefficient is 200 W/m²-K and heat capacity of both the hot and cold stream is 3200 W/K. The effectiveness of heat exchanger will be.

Question 8

A small sphere of outer area 2.4 m² is totally enclosed by a large cubical hall. The shape factor of hall w.r.t sphere is 0.004. What is the measure of the internal side of the cubical hall (in meters)?

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ESE & GATE ME General

Jun 25ESE & GATE ME