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TS EAMCET 5 May 2018 Shift 1 Solved Paper
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© examsnet.com
Question : 17
Total: 160
An electric heater with constant heat supply rate is used to convert a certain amount of liquid ammonia to saturated vapour at high pressure. The heater takes 14 minutes to bring the liquid at 15 °C to the boiling point of 50 °C and 92 minutes to convert the liquid at the boiling point wholly to vapour. If the specific heat capacity of liquid ammonia is 4.9 kJ/kg K. the latent heat of vaporization of ammonia in kJ/kg is
557
981
1127
2250
Validate
Solution:
Consider Mass of liquid ammonia taken as m and rate of heat supplied is r.
Then the heat exchanged equation is given by
r
×
14
=
m
×
4.9
×
(
50
−
15
)
r
×
92
=
m
L
Solving above two equations,
L
=
1127
k
J
∕
k
g
© examsnet.com
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