#### Question

a.

True

b.

False

c.

May be

d.

Can't say

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###### Q. “All the factors relating to geometry of the sections are grouped together into a multiple constant called the shape factor” True or false

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Q. Shape factor for plane wall is equal to

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Q. Which is true regarding a complete rectangular furnace?

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Q. The shape factor for complete rectangular furnace is

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Q. The inner and outer surfaces of a furnace wall, 25 cm thick, are at 300 degree Celsius and 30 degree Celsius. Here thermal conductivity is given by the relation

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Q. A plane wall of thickness δ has its surfaces maintained at temperatures T₁ and T₂. The wall is made of a material whose thermal conductivity varies with temperature according to the relation k = k₀ T². Find the expression to work out the steady state heat conduction through the wall?

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Q. With respect to the equation k = k0 (1 +β t) which is true if we put β = 0?

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Q. The unit of thermal conductivity doesn’t contain which parameter?

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Q. The temperatures on the two sides of a plane wall are t1 and t2 and thermal conductivity of the wall material is prescribed by the relation

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Q. A cable of 10 mm outside is to be laid in an atmosphere of 25 degree Celsius (h = 12.5 W/m² degree) and its surface temperature is likely to be 75 degree Celsius due to heat generated within it. How would the heat flow from the cable be affected if it is insulated with rubber having thermal conductivity k = 0.15 W/m degree?

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