1.  In case of heat conduction through plane wall, which one of the following is not a correct assumption? 
a.  Steady state 
b.  Three dimensional heat flow 
c.  Volumetric heat generation must be constant 
d.  K must be constant 
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Answer: (b).Three dimensional heat flow

2.  If Q X is heat generated in at distance ‘x’, then heat conducted out at a distance (x + d x) will be 
a.  Q X + 3d (Q X) d x /d x 
b.  2Q X + d (Q X) d x /d x 
c.  d (Q X) d x /d x 
d.  Q X + d (Q X) d x /d x 
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Answer: (d).Q X + d (Q X) d x /d x

3.  Notable example of uniform generation of heat within the conducting medium are
(i) Energy of a nuclear reactor (ii) Liberation of energy due to some exothermic chemical reactions (iii) Resistance heating in electrical appliances Which of the statements made above are correct? 
a.  1, 2 and 3 
b.  1 and 2 
c.  1 and 3 
d.  Only 2 
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Answer: (a).1, 2 and 3

4.  For a plane wall of thickness l with uniformly distributed heat generation q g per unit volume, the temperature t₀ at mid plane is given by 
a.  t₀ = q g l²/2k +t w 
b.  t₀ = q g l²/4k +t w 
c.  t₀ = q g l²/8k +t w 
d.  t₀ = q g l²/16k +t w 
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Answer: (c).t₀ = q g l²/8k +t w

5.  The temperature drop in a plane wall with uniformly distributed heat generation can be decreased by reducing 
a.  Wall thickness 
b.  Heat generation rate 
c.  Thermal conductivity 
d.  Surface area 
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Answer: (a).Wall thickness
