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GATE 2019: Heat Transfer Quiz 1

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Question 1

A,B,C,D,E,F & G are the layers of different materials thorough which is heat is to be flow.
If the resistance value of different layers are 
Ra= 5 K/W, Rb=Rc=Rd= 2K/W, Re= 3K/W, Rf= 1K/W, Rg= 1.5K/W

                       

Then effective resistance value for the given circuit will be

Question 2

According to electrical analogy, for a rectangular slab of length L, area A and thermal conductivity K, the resistance can be written as

Question 3

Heat flows through a composite slab as shown below, The depth of the slab is 10 cm. The k values are in W/m-K. The heat flow rate through the composite wall in W is
Description: Description: E:\Gate\SSC JE Mechanical Part 1\Made Easy Questions\08_Heat-Transfer_BLok_files\image060.png

Question 4

A plane wall has a thermal conductivity of 1.15 W/m.K. If the inner surface is at 1100 °C and the outer surface is at 350 °C, then the design thickness (in meter) of the wall to maintain a steady heat flux of 2500 W/m2 should be______

Question 5

A material P of thickness 1 mm is sandwiched between two steel slabs, as shown in the figure below. A heat flux 10 kw/m2 is supplied to one of the steel slabs as shown. The boundary temperatures of the slabs are indicated in the figure. Assume the thermal conductivity of this steel is 10 W/mK. Considering one-dimensional steady state heat conduction for the configuration, the thermal conductivity (k, in W/m.K) of material P is ____________.

Question 6

A 1 cm diameter cable made of a metal is to be insulated with rubber (k=0.17 W/m-K) is laid in to atmosphere of 200C with outside heat transfer coefficient 21.25 W/m2-K. The surface temperature of metal is likely to be 650C due to heat generation within. The maximum heat dissipation (W) per meter length of the cable will be
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