56.  With respect to the equation k = k0 (1 +β t) which is true if we put β = 0? 
a.  Slope of temperature curve is constant 
b.  Slope of temperature curve does not change 
c.  Slope of temperature curve increases 
d.  Slope of temperature curve is decreases 
View Answer Report Discuss 5050! 
Answer: (a).Slope of temperature curve is constant

57.  If β is greater than zero, then choose the correct statement with respect to given relation
k = k0 (1 +β t) 
a.  k doesn’t depends on temperature 
b.  k depends on temperature 
c.  k is directly proportional to t 
d.  Data is insufficient 
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Answer: (c).k is directly proportional to t

58.  The unit of thermal conductivity doesn’t contain which parameter? 
a.  Watt 
b.  Pascal 
c.  Meter 
d.  Kelvin 
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Answer: (b).Pascal

59.  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
K = k0 e^(x/δ) Where, k0 is constant and δ is the wall thickness. Find the relation for temperature distribution in the wall? 
a.  t 1 – t x / t 1 – t 2 = x 
b.  t 1 – t x / t 1 – t 2 = δ 
c.  t 1 – t x / t 1 – t 2 = δ/x 
d.  t 1 – t x / t 1 – t 2 = x/δ 
View Answer Report Discuss 5050! 
Answer: (d).t 1 – t x / t 1 – t 2 = x/δ

60.  “If β is less than zero, then with respect to the relation k = k0 (1 + β t), conductivity depends on surface area”. True or false 
a.  True 
b.  False 
c.  May be 
d.  Can't say 
View Answer Report Discuss 5050! 
Answer: (b).False
