Engineering Thermodynamics (PETE2101)
Petroleum Engineering - PET
Semester: First Semester
Level: 200
Year: 2018
School/Faculty: NAIHP1 DEPARTMENT/YEAR: PETE/Year 1 LECTURER(S): Dr. Bawe G
COURSE CODE: PETE 2103 COURSE TITLE: ENGINEERING THERMODYNAMICS COURSE CREDIT: 03
DATE: 07/05/2018 HALL: NAHP12 TIME: 2hr
THE UNIVERSITY OF BAMENDA
P.O BOX 39 Bambili
REPUBLIC OF CAMEROON
Peace-Work-Fatherland
0 .
. 1 7 0
r.
Instructions:
Answers all
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Questions
Q1 a. One mole of a monatomic perfect gas initially at temperature To expands from
volume Vo to 2Vo. (a) at constant temperature (b) at constant pressure. Calculate the
work of expansion and the heat absorbed by the gas in each case
Q1 b. For a diatomic ideal gas near room temperature, what fraction of the heat
supplied is available for external work if the gas is expanded at (a) constant
pressure? (b) constant temperature?
Q2. 10 liters of gas at atmospheric pressure is compressed isothermally to a volume
of 1 liter and then allowed to expand adiabatically to 10 liters.
a) Sketch the process on a pV diagram for a monatomic gas
b) Make a similar sketch for a diatomic gas
c) Is a network done on or by the system?
d) Is it greater or less?
Q3. Two systems with heat capacities C1 and C2 respectively, interact thermally and
come to a common temperature T
f
. If the initial temperature of system 1 was T
f5
, what
was the initial temperature system 2? You may assume that the total energy of the
combined systems remains constant.
Q4. Calculate an engine working in a reversible cycle and using an ideal gas with
constant heat capacity c
p
as the working substance. The cycle consists of two
processes at constant pressure, joined by two adiabatics
a) Which temperature of T
a
, T
b
, T
c
and Td is highest, and which is lowest?
b) Find the efficiency of this engine in terms of p
1
, p
2
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