Question

108 109 5) The specific energy of some gas is increased by 100 kJ/kg in a vessel with constant volume. 110 The vessel has a volume of 200 litres [2 marks] 111 The initial pressure is 101 kPa 112 The intial temperature is 300 K 113 The gas constant is 2078.5 J/(kg K) 114 The ratio of specific heats is 1.6 115 What is the heat transfer to the gas and what is its change in entropy? 116 117 A) 3.24 J A) 0.01 J/K 118 B) 234 B) 23 J/K 119 C) 100 C) 56.5 J/K 120 D) 12434 D) 318 J/K 121 E) 32,456 E) 345 J/K 122 F) none of the above : F) none of the above : 123 actual value actual value J/K 124 125 J J - J 19c

Answer 1

Given data in energy change (DE)- 100 KT/Kg process Constant volume volume of reusel (r) = 200 litres M²= = 1000 litres r 0.2 M3 3ook Initial pressure pressure (P ). (p. ) = rolkpa Initial temperature (11) Cras constant Tlogic ratio of specific heats (%) = 1.6 For non- flow process ( و ) 20 78.5 Q = DET setyono For constant volume wid= DE w - Sear Q = 1001 100 kilkg dre Gas equation Pri= mrti 101x10? 10.2 = Mt 2078.5 x 300 M=0.0323 kg

in Unit Mais Q is por the mais by mutplying convert this by in T to heat transfer 0.0323 x 100 x 10 xio Q = Heat transfer 32300 We know СР- Сү= 5 Dividing cr on both indes Cp i a . CV cr rol - Cr Cr= (r.1) ין 2078.15 (16-1) Cr=3464.16 lkgk (for non-flow Q DE = E Mer (T2 ~?) process 3230 = 0.0323 x 3464.16 (T2-300) 12 - 328.86 K

ds dQ T } do- j do 2 şds s Marat dů a Mcydt for Content volume Mer enc 52-5, 1,- T 11 as= 0.0323x3484.16xln / 328.86 300 osa 10.277 T/K Both Heat transfer (Q 1= 3230 T change in entropy (AS) in entropy (As) = 10.277 TIK answers are (F) none of the above