THERMODYNAMICS
/ CHPTER 5
Lec. Saleh Hasson
THERMODYNAMICS
/ CHPTER 5
Lec. Saleh Hasson
Results of the first law
1- Reversible process
If a simple system (a system can determine it's state by P , v , T) gave
a little heat
Q
du
Q , the work done by the sys
Question 1
(a) Water with a density and kinematic viscosity of =1000 kg/m3 and =1x10-6m2/s,
respectively, flows down a car parking area with a slope angle to the horizontal and
100 m wide. If the hydrostatic effects are ignored (i.e. gravity is the only d
Question 1
A pin-jointed space frame, shown in Figure Q1, consists of five bar members connected
together at point 1 with fully fixed supports at points 2, 3, 4, 5 and 6. Point 2 lies on the
vertical XY plane and points 4, 5 and 6 lie on the vertical YZ p
Question 1
(a)
Explain in detail, with a diagram, how an optical pyrometer is used to determine gas,
soot and/or surface temperatures in high temperature environments.
[6 marks]
(b)
The soot from a flame emits a blackbody spectrum with a maximum intensity
No.
CITY UNIVERSITY
LONDON
BSc Degree Courses:
Electrical and Electronic Engineering
Computer Systems Engineering
BEng Degree Courses:
Aeronautical Engineering
Air Transport Engineering
Computer Systems Engineering
Electrical and Electronic Engineering
Me
Question 1
A horizontal irrotational flow system results from the combination of a free vortex,
rotating anticlockwise, of strength K=2vr , located with its centre at the origin, with a
uniform flow of velocity U in the x-direction.
a)
Derive general expr
Question 1
(a)
A panel element of width a, height b, and thickness t is subjected to forces Fx, Fy, Fz,
and moments Mx, My, Mz acting about the x, y and z axes, respectively. The method of
Simple Structural Surfaces can be used in the evaluation of vehicl
Question 1
a)
Define:
i)
A Fluid
[3 Marks]
ii)
Newtons Law of Viscosity.
[7 Marks]
b)
A cylinder, with a shaft attached through its centre, spins at a constant angular
velocity of 1200 rads/second inside a tube filled with oil (Fig. Q1). The shaft
torque
No.
CITY UNIVERSITY
SCHOOL OF ENGINEERING AND MATHEMATICAL SCIENCES
MEng/BEng in Aeronautical and Air Transport Engineering
PART II EXAMINATION
AIRCRAFT STRUCTURAL ANALYSIS AND MATERIALS
[AE2202]
PAPER 2
Examiners: Dr. C.W. Cheung (Q1-Q3)
Dr. J. Busfield
Module AE3250: Dynamics and Control - Resit
Examiner: Dr P Liatsis
Question 1
(a)
For the RLC network in Figure Q1, find the transfer function:
G ( s) =
Y ( s)
U (s)
Give expressions for the natural frequency n and the damping ratio in terms of R1, R2,
C
Question 1
The pin-jointed plane frame shown in Figure Q1 comprises six bar members and four
nodes. The diagonal members cross at the centre of the frame without being
connected there. All members of the frame have the same value of axial rigidity, equal
Question 1
The conductivity of a pipe material is a function of temperature: k(t) = (6 + 0.2t)
W/mK, where t is given in oC. The inner pipe diameter is 0.05 m, and the pipe wall
thickness is 0.015 m. The inner pipe surface temperature is maintained at 100
Question 1:
(a) Explain (with the use of a block diagram) the operation of a high-powered pulsed radar system
[8 marks]
(b) A duplex radar system has a directional antenna with the transmitted pulse power Pt, gain Gt and an
effective area of Ar. Consideri
Question 1
The method of Simple Structural Surfaces can be used in the evaluation of vehicle structures:
(a)
For a panel element of width a, height b, and thickness t, subjected to forces Fx, Fy, Fz,
and moments Mx, My, Mz acting about the x, y and z axes
Question 1
(a) Give an expression of the gradient f of a scalar field f ( x, y, z ) in Cartesian
co-ordinates. Show that f at a point ( x0 , y0 , z0 ) is orthogonal to the levelcontour f ( x, y, z ) = f ( x0 , y0 , z0 ) .
[6 marks]
(b) Find all critical p
Question 1
(a)
Show that the thermodynamic efficiency of a simple open-circuit gas turbine
plant with a compressor isentropic efficiency and turbine isentropic efficiency
of C and T respectively, and the ratio of specific heats given by k for the air
and
No:
CITY UNIVERSITY
LONDON
PART 2 EXAMINATION
ENGINEERING MATHEMATICS 2
EX2001 and EX2003
Date: May 2007
Time: 3 hours
Attempt FIVE out of EIGHT questions
Page1 of 7
EX2001 Engineering Mathematics-07.doc
Question 1
(a) Find all critical points of the func
Section A
Professional, Industrial and Management Studies (PIMS)
(Answer both questions from this section)
Question 1
Three quantities form the basis for cost performance measurement using Earned
Value Management. They are Budgeted Cost of Work Scheduled
Question 1
Consider the following equation, where u is the fluid velocity and x and y the
directions of the Cartesian coordinate system:
u x u y
+
=0
x
y
a) Which conservation law is expressed by this equation and under which
assumptions?
[ 5 marks ]
b) E
Question 1
(a) (i) Explain what is meant by absolute probability and what is meant by conditional
probability.
[2 marks]
(ii) A given population (eg the population of the UK or a collection of similar
engineering components) will have a failure probabilit
SECTION A DYNAMICS
Attempt any two questions from this section
Question 1
The trolley in the Fig. Q1 has the mass m and rests on frictionless wheels. The
trolley is connected to the wall using a system of springs with the spring constant
k and a single da
Question 1
(a)
A pulsed Nd:YAG laser is to be employed in a Rayleigh scattering experiment
to determine gas temperature. The laser can be used at 532 nm (second
harmonic), 355 nm (third harmonic), or 266 nm (fourth harmonic). If the laser
linewidths are t
Question 1
(a)
A pulsed Nd:YAG laser is to be employed in a Rayleigh scattering experiment
to determine gas temperature. The laser can be used at 532 nm (second
harmonic), 355 nm (third harmonic), or 266 nm (fourth harmonic). If the laser
linewidths are t
Question 1
(a) The three primary maintenance processes recognised by the CAA and FAA are;
hard-time, on-condition, and condition-monitoring. Explain these three
maintenance processes by giving an example of each.
[8 marks]
(b) Explain the MSG-3 assigned t
Question 1
a) The momentum equation of a fluid in motion can be written in the form:
Dui
1 P 2ui + ui
(
)
= Fi
+
+
xi x 2j
xi x j
Dt
(1)
Using the following definition of dimensionless parameters for density, velocity,
distance, time and pressure:
=
,
Seat No:
School of Engineering & Mathematical Sciences
BEng in Biomedical Engineering and Applied Physics
BEng in Electrical and Electronic Engineering
BEng in Media Communication Systems
BEng in Multi-media and Internet Systems
BSc / BEng in Computer Sys
Question 1
(a) Use your knowledge of metals processing to explain how a metallic body panel for
use as an aircraft skin is made. Your answer should explain why casting is not a
suitable manufacturing route.
[11 marks]
(b) Explain why is it desirable to us
Section A Gas Turbines
Question 1
A critical isentropic flow exists within a converging-diverging duct with the following
parameters: A-in/A-th = 2.50, intake diameter D-in = 85cm, p-in = 0.11MPa,
-in = 300K, p-out = 37,841.80 Pa. Determine the following
Question 1
(a)
Determine the products for the reaction
C16H34 + 20 (O2 + 3.76 N2) b CO2 + c CO + d H2O + e H2 + f N2
at 2400 K in a diesel furnace, using the water-gas shift reaction
CO + H2O CO2 + H2.
[14 marks]
For the reaction
CxHy + a (O2 + 3.76 N2) b
Question 1
(a) Calculate the following limits:
(i) lim x
ln x
,
x
(ii) lim x
sin x
2 x 2 + 3x + 1
, (iii) lim x 0
2
x
x + 2x + 3
(10 marks)
(b) Find the domain and range of the function: f ( x) =
1
and sketch its graph.
x 1
(10 marks)
Question 2
3
(a) S