6.  The temperature distribution in a large thin plate with uniform surface temperature will be
(Assume steady state condition) 
a.  Logarithmic 
b.  Hyperbolic 
c.  Parabolic 
d.  Linear 
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Answer: (d).Linear

7.  Let us assume two walls of same thickness and crosssectional area having thermal conductivities in the ratio 1/2. Let us say there is same temperature difference across the wall faces, the ratio of heat flow will be 
a.  1 
b.  1/2 
c.  2 
d.  4 
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Answer: (b).1/2

8.  The interior of an oven is maintained at a temperature of 850 degree Celsius by means of a suitable control apparatus. The oven walls are 500 mm thick and are fabricated from a material of thermal conductivity 0.3 W/m degree. For an outside wall temperature of 250 degree Celsius, workout the resistance to heat flow 
a.  0.667 degree/W 
b.  1.667 degree/W 
c.  2.667 degree/W 
d.  3.667 degree/W 
View Answer Report Discuss 5050! 
Answer: (b).1.667 degree/W

9.  A plane slab of thickness 60 cm is made of a material of thermal conductivity k = 17.45 W/m K. Let us assume that one side of the slab absorbs a net amount of radiant energy at the rate q = 530.5 watt/m². If the other face of the slab is at a constant temperature t₂ = 38 degree Celsius. Comment on the temperature with respect to the slab? 
a.  87.5 degree Celsius 
b.  32 degree Celsius 
c.  47.08 degree Celsius 
d.  32.87 degree Celsius 
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Answer: (c).47.08 degree Celsius

10.  The rate of heat transfer for a plane wall of homogenous material with constant thermal conductivity is given by 
a.  Q = kA (t₁t₂)/δ 
b.  Q = 2kAx/ δ 
c.  Q = 2kAδx 
d.  Q = 2k/δ x 
View Answer Report Discuss 5050! 
Answer: (a).Q = kA (t₁t₂)/δ
