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ISRO ME Quiz 2 : Heat & Mass Transfer

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Question 1

An unconstrained thin circular disc has a concentric hole in it. On heating the diameter of the hole will

Question 2

Given that Nu = Nusselt number,
Re = Reynolds number, Pr = Prandtl number
Sh = Sherwood number, Sc = Schmidt number, Gr = Grashoff number
The function relationship for free convective heat transfer is given as,

Question 3

A spherical shaped vessel of 1.4 m outer diameter is 90mm thick. Find the rate of heat leakage, if the temperature difference between the inner and outer surfaces is 220 °C. Thermal conductivity of the material of the sphere is 0.083 W/mK.

Question 4

For infinite parallel planes with emissivities

and

, the interchange factor for radiation from surface 1 to surface 2 is given by

Question 5

What is the net radiant interchange per square meter for two very large plates at temperatures 800 K and 500 K respectively. (The emissivity of the hot and cold plates are 0.8 abd 0.6 respectively. Stefan Boltzmann constant is 5.67 X

Question 6

In a furnace made of bricks

Inside heat transfer coefficient = 35 W/ $Description: Description:ISROME2009_files\image024.png$ k

Outside heat transfer coefficient = 25 W/ $Description: Description:ISROME2009_files\image024.png$ k

Thermal conductivity of bricks (15 cm thick) = 0.15 W/ $Description: Description:ISROME2009_files\image024.png$ k
Find Overall Heat transfer coefficient

Question 7

Emissivities of two large parallel plates maintained at 900 °C and 400 °C are 0.3 and 0.5 respectively. What is the net radiant heat exchanger per square meter for the plate ?

Question 8

A heat exchanger is used to heat cold water (C_p=4.18kJ/kg-K) entering at 12⁰C at a rate of 1.2 kg/s by hot air (C_p=1.005 kJ/kg-K) entering at 90⁰C at rate of 2.5 kg/s. The highest rate of heat transfer in the heat exchanger is

Question 9

A counter flow heat exchanger is used to heat from 20⁰C to 80⁰C by using hot exhaust gas entering at 140⁰C and leaving at 80⁰C. the log mean temperature difference for the heat exchanger is

Question 10

For a heat exchange, ΔT_max is the maximum temperature difference and ΔT_min is the minimum temperature difference between the two fluids. LMTD is the log mean temperature difference. C_min and C_max are the minimum and the maximum heat capacity rates. The maximum possible heat transfer (Q_max) between the two fluids is

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ESE & GATE ME Heat Transfer

May 18ESE & GATE ME