Thermodynamics (FSCT3108)
Mechanical Engineering - MEN
Semester: First Semester
Level: 300
Year: 2019
REPUBLIC OF CAMEROON The UNIVERSITY OF BAMENDA
Peace — Work - Fatherland P.O. BOX 39 Bambili
School: HTTTC Department: _INDUSTRIAL TECHNICQUES Lecturer(s): Dr. NDIKUM ERIC
Course Code: FSCT2204 Course Title:
THERMODYNAMICS
Date: /07/2019 Hall: Duration: 1 Hr 30 Min
INSTRUCTIONS: ANSWER ALL QUESTIONS
QUESTION 1 (14 Mks)
The mass of air in a room 3 cm x 5 cm x 20 cm is known to be 3.5 x 10
5
g. Determine
i) the density ii) the specific volume iii) the specific weight of the air
QUESTION 2 (12 Mks)
One mole of oxygen gas is at a pressure of 6.00 atm and a temperature of 27.0°C.
(a) If the gas is heated at constant volume until the pressure triples, what is the final
temperature? (b) If the gas is heated until both the pressure and volume are doubled, what
is the final temperature?
QUESTION 3 (12 Mks)
Find the minimum amount of ice at - 10 °C needed to bring the temperature of 500 g of
water at 20 °C down to 0 °C. (c
water
=4185 KJ/kg°C, c
lce
= 2.09 KJ/kg°C, L
f,ice
= 335 KJ/kg)
QUESTION 4 (14 Mks)
A gas expands by 1.2L at a constant pressure of 2.5 bar. Find the change in the internal
energy of the gas if 0.5 KJ of heat is added during the expansion. (1L = 10
3
m
3
, 1 bar = 10
5
Pa)
QUESTION 5 (18 Mks)
A carnot engine absorbs 1 MJ of heat from a reservoir at 300 °C and exhausts heat to a
reservoir at 150 °C. Find the work it does.
ALL THE BEST!!!!
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