Questions
61
Universal gas constant is defined as equal to product of the molecular weight of the gas and
Answer: gas constant
62
The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is
Answer: 83.14J/kmol°K
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64
If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called
Answer: free expansion
66
For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be
Answer: zero
67
Molecular volume of any perfect gas at 600 x 103 N/m2 and 27°C will be
Answer: 4.17m3/kgmol
68
The more effective way of increasing efficiency of Carnot engine is to
(a)
(b)
(c)
(d)
(e) keep lower temperature constant.
Ans: d
Answer: decrease lower temperature
70
According to first law of thermodynamics
Answer: total energy of a system remains constant
71
Energy can neither be created nor destroyed but can be converted from one form to other is inferred from
Answer: first law of thermodynamics
