Assignment-1
(Due Date: 16/03/2023)
Instruction
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This assignment is a part of the Exam. Therefore, any query regarding the solution
to the problem will not be entertained. Assume appropriate values for any missing
data/information.
The assignment must be Handwritten.
Numerical answers till the 3rd decimal are required to be written. Each
question will have unique answers based on the student‘s ID number. No
marks even for the correct procedure will be awarded if the Wrong ID Number
is used to solve the numerical questions.
Schematic and/or Ts diagrams (whichever is applicable) of the questions with
complete labeling must be sketched.
Submission must be Electronic as a single pdf-file (no Image or word file) within MS
Teams.
No marks will be assigned to all the assignments with the same handwriting and/or
for late submissions.
Question-1:
Air in piston–cylinder assembly undergoes a
process from state 1, where T1 is the initial
temperature, p1 = 100 kPa, to state 2, where T2 = 500 K, p2 = 650 kPa. Using the ideal gas model
for air, determine the change in specific entropy between these states, if the process occurs
(a) without internal irreversibilities, (b) with internal irreversibilities, (c) Sketch the schematic
and Ts-diagrams of the system with complete labeling.
Note: T1 = Last 2 digits of Student ID Number
For example: if your ID Number is 202006719 then T1 = 19 oC.
Question-2:
Steam enters a turbine operating at a steady state at 1 MPa, and T (→ Temperature = 200 +
Last 2 digits of Student ID Number in oC) and exits at 40oC with a quality of 83%. Stray heat
transfer and kinetic and potential energy effects are negligible.
(a) Sketch the schematic and Ts-diagrams of the system with complete labeling.
Determine:
(b) the power developed by the turbine, in kJ per kg of steam flowing,
(c) the change in specific entropy from inlet to exit, in kJ/K per kg of steam flowing.
Question-3:
A rigid tank contains 8 kg of saturated vapor steam at T (→ where T = 100 + Last 2 digits
of Student ID Number in oC). The steam is cooled to the ambient temperature of 25 oC.
(a)
Sketch the process on a T-s diagram.
(b)
Determine the entropy change of the steam, in kJ/K.
(c)
For the steam and its surroundings, determine the total entropy change associated with
this process, in kJ/K.
Question-4:
Two m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at T (where T =
200 + Last 2 digits of Student ID Number in K), 200 kPa. The air receives 710 kJ by work
from the paddle wheel. Assuming the ideal gas model with cv = 0.72 kJ/kg K,
(a) Sketch the schematic diagram.
Determine for the air:
(b) the mass, in kg,
(c) final temperature, in K, and
(d) the amount of entropy produced, in kJ/K.