Engineering Thermodynamics (PETE2101)
Petroleum Engineering - PET
Semester: First Semester
Level: 200
Year: 2019
UNIVERSITY OF BAMENDA
NAHPI (SCHOOL OF ENGINEERING)
First Semester Examination
DEPARTMENT/Year: PETE/Year 1 COURSE INSTRUCTORS: Dr Bawe
Hall: NAHPI AMPHI
COURSE CODE: PETE2101
DATE: 15/03/2019 COURSE TITLE: Engineering Thermodynamics
TIME: 13:00 — 15:00 TIME ALLOWED: 2 HoursCREDIT VALUE: 4
INSTRUCTIONS: Answer ALL Questions.
Ex. 1. The length of the mercury column in the old-fashioned mercury-in-
glass thermometer is 15.00 cm when the thermometer is in contact with
water at its triple point. Consider the length of the mercury column as the
thermometric property X and let 9 be the empirical temperature
determined by this thermometer.
(a) Define key terms thermometric substance and thermometric
property.
(b) What do you understand by 'Empirical temperature'?
(c) Calculate the empirical temperature when the length of the
mercury column is 19.00cm.
(d) If X can be measured with a precision of 0.01 cm, can this
thermometer distinguish between the normal freezing point of water
and the triple point of water? Prove/explain your answer.
Ex. 2. (a) The resistance of platinum at the ice point is 15.34 ohms and
17.15 ohms at the steam point. What will be the temperature when the
resistance if 22.5 ohms?
(b)
What will be the resistance at the sulphur point (660
0
C)?
(c)
The table below compares the response behavior of mercury-in-glass and
the platinum-resistance thermometer; of their respective thermometric
substances with temperature. Explain why they do not correspond at all
temperatures.
Thermometer type
Various temperature
Mercury
-in-
glass
0
50
100
200
300 °C
Platinum-resistance
0 50
50.2 197
291 °C
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Ex. 3, In the table below, a number in the top represents the pressure of a
gas in the bulb of a constant-volume gas thermometer (corrected for dead
space, thermal expansion of bulb, etc.) when the bulb is immersed in a
water-triple-point cell. The bottom row represents the corresponding
readings of the pressure when the bulb is surrounded by a material at a
constant unknown temperature. Calculate the ideal-gas temperature T of
this material. (Use five significant figures.)
P
TP
,
kPa
133.32
99.992 66.661
33.331
P, kPa
204.69
153.54 102.37
51.190
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