Department of Aerospace Engineering
Assignment_2
Submission deadline: 20th May 2022
Submission mode: Google Classroom
Bloom’s
Q.No Question Marks COs
Level
Air enters a nozzle steadily at 280 kPa and 77oC with a velocity of 50
m/s and exits at 85 kPa and 320 m/s. The heat losses from the nozzle
1. to the surrounding medium at 20oC are estimated to be 4.8 kJ/kg. 7 3 L1
Determine (a) the exit temperature and (b) the total entropy change
for this process.
1-kg of air at 200 kPa and 127oC is contained in a piston-cylinder
device. Air is now allowed to expand in a reversible, isothermal
2. 6 3 L5
process until its pressure is 100 kPa. Determine the amount of heat
transferred to the air during this expansion.
The turbines in steam power plants operate essentially under
adiabatic conditions. A plant engineer suggests to end this practice.
She proposes to run cooling water through the outer surface of the
3. casing to cool the steam as it flows through the turbine. This way, she 5 4 L3
reasons, the entropy of the steam will decrease, the performance of
the turbine will improve, and as a result the work output of the turbine
will increase. How would you evaluate this proposal?
On a T-s diagram, does the actual exit state (state 2) of an adiabatic
4. turbine have to be on the right-hand side of the isentropic exit state 4 4 L3
(state 2s)? Why?
The exhaust nozzle of a jet engine expands air at 300 kPa and 1808C
adiabatically to 100 kPa. Determine the air velocity at the exit when
5. 8 3 L2
the inlet velocity is low and the nozzle isentropic efficiency is 96
percent.
Vamsi Krishna Chowduru
Asst Prof
Assignment_2
Submission deadline: 20th May 2022
Submission mode: Google Classroom
Bloom’s
Q.No Question Marks COs
Level
Air enters a nozzle steadily at 280 kPa and 77oC with a velocity of 50
m/s and exits at 85 kPa and 320 m/s. The heat losses from the nozzle
1. to the surrounding medium at 20oC are estimated to be 4.8 kJ/kg. 7 3 L1
Determine (a) the exit temperature and (b) the total entropy change
for this process.
1-kg of air at 200 kPa and 127oC is contained in a piston-cylinder
device. Air is now allowed to expand in a reversible, isothermal
2. 6 3 L5
process until its pressure is 100 kPa. Determine the amount of heat
transferred to the air during this expansion.
The turbines in steam power plants operate essentially under
adiabatic conditions. A plant engineer suggests to end this practice.
She proposes to run cooling water through the outer surface of the
3. casing to cool the steam as it flows through the turbine. This way, she 5 4 L3
reasons, the entropy of the steam will decrease, the performance of
the turbine will improve, and as a result the work output of the turbine
will increase. How would you evaluate this proposal?
On a T-s diagram, does the actual exit state (state 2) of an adiabatic
4. turbine have to be on the right-hand side of the isentropic exit state 4 4 L3
(state 2s)? Why?
The exhaust nozzle of a jet engine expands air at 300 kPa and 1808C
adiabatically to 100 kPa. Determine the air velocity at the exit when
5. 8 3 L2
the inlet velocity is low and the nozzle isentropic efficiency is 96
percent.
Vamsi Krishna Chowduru
Asst Prof
