Departmental Profile
The D
epartment of Mechanical Engineering has been contributing its humble share of the
Mechanical Engineering graduates for National needs since 2001. Several graduates who
have passed out of this department are occupying responsible
positions in various
Engineering Industries like Kirloskar, Steel Authority of India Limited, Tata Consultancy
Services, Engineers India Limited, Hindustan Petroleum Corporation Limited, Infosys,
Bharat Heavy Electrical Limited, Swaraj, Sonalika, Torrent T
echnologies and holding
responsible positions in the premier educational institutes in and outside India.
Department has encouraged faculty and other staff to attend/organize various STC,
workshop, seminar and conferences. Department has organized expert
lectures on
different research areas by the experts of national repute institutes for the benefit of
students and faculty. Department has sponsored a number of faculties and other staff
members for higher studies under QIP. Punjab Technical University has
also established a
regional study center for Post

graduation course Master of Technology in Thermal
Engineering since 2004.
Faculty
The faculty in the department consists of well experienced Assistant Professors and
lecturers with rich and wide experie
nce.
Sr. No
Teaching Faculty
Designation
1
Dr. Arjan Singh
Prof.
2
Rajesh Kumar
Ass
ociate
. Prof.
&
Head
3
Aman Bansal
Ass
ociate
. Prof.
4
Adarsh Kumar
Asstt. Prof.
5
Rakesh Kumar
Asstt. Prof.
6
Jatinder Singh
Asstt. Prof.
7
Gurdeep Singh
Asstt.
Prof.
8
Prabhjot Kaur
Asstt. Prof.
9
Devinder Pal Singh
Asstt. Prof.
10
Jagjit Singh
Asstt. Prof.
11
Onkar Singh
Asstt. Prof.
12
Avtar Singh
Asstt. Prof.
13
Mithlesh Sharma
Asstt. Prof.
14
Naveen Kumar
Asstt. Prof.
15
Prabhjot Singh
Asstt. Prof.
Sr. No
Laboratory Staff
Designation
1
Mr. P.C Saini
Lab. Tech.
2
Mr. Jaspal Singh
Jr.
Lab. Tech
Evaluation of Students Academic Performance
Students’ academic performance is evaluated by internals and external
examinations. Weightages to
theory and practical examination is given below:
Theory
60% Weightage is assigned for external examination.
40% Weightage is assigned internal examination. 60% of the total internal
evaluation is based upon the sessional marks. 20% of total internal ev
aluation
is based upon attendance and rest 20% is based upon assignments & tutorials
work.
Practical
40% Weightage is assigned for external examination.
60% Weightage is assigned internal examination. 66% of the total internal
evaluation is based upon i
ndividuals’ lab performance and practical

notebook,
17% of total internal evaluation is based upon attendance and rest 17% is based
upon internal practical viva.
Every semester, the Institute conducts three sessional tests as per following
University inst
ructions:
1
st
sessional covers
5
0% of the total syllabus.
2
nd
sessional covers next
5
0% of the syllabus.
3
rd
sessional covers remaining
10
0% of the syllabus.
Each sessional examination is divided into following sections:
Section A consists of four questio
ns carrying 2 marks each (total 8
marks) all questions are compulsory.
Section B consists of three questions out of which a student is to
attempt two question each question carries 4 marks (total 8 marks).
Section C consists of two questions out of which a
student is to attempt
one question carrying 8 marks.
During the four year course of B. Tech. each student has to undergo three practical
training.
(i) Practical Training
–
I (Six weeks)
It is a six weeks institutional/industrial training after the 2
nd
se
mester. The student is
evaluated out of a total of 100 marks, in which 60 marks are for internal and 40 marks
for external.
(ii)Practical Training

II (Six weeks)
It is a week’s institutional/industrial training after the 4
th
semester. The student is
evalua
ted out of total of 100 marks, in which 60 marks are for internal and 40 marks
for external.
(iii) Practical Training

III / Six months Industrial Training
It is a six months industrial training and is conducted in 7
th
or 8
th
semester in a reputed
industr
y. There is a joint appraisal during the six month period which is conducted by
the training manager / supervisor from the industry and teacher from the college. The
appraisal is based on project work and presentation made by student. The teacher
makes two
visits during the training and evaluates the student. The student is
evaluated out of 1000 marks in which 500 marks are for internal and 500 marks for
external.
Course Structure and Teaching Schedule
(
FOURTH
SEMESTER
)
NOTE: There shall be industrial tr
aining of 06 weeks duration in reputed industries at
the end of 4
th
semester. The marks for this will be included in the 5
th
semester.
BT
ME

401
STRENGTH OF MATERIALS

II
Syllabus to be covered
w
eek
wise
Week

1
Theories of Failure : Maximum principal stress theory, maximum shear stress
Theory, Total strain energy theory, shears strain energy theory.
Grap
hical
representation and derivation of equation for each and their application
to
problems relating to two dimensional stress systems only.
Course No.
Subject
L
T
P
Marks
Total
Marks
Duration
of Exam
Hrs.
Int.
Ext.
BTME401
Strength of Materials
–
II
4
1

40
60
100
5
BTME402
Theory of Machines
–
II
4
1

40
60
100
5
BTME403
Fluid Mechanics
4
1

40
60
100
5
BTME404
Applied
Thermodynamics

II
4
2

40
60
100
5
BTME405
Manufacturing
Processes

II
4


40
60
100
4
BTME406
Fluid Mechanics Lab


2
30
20
50
1
BTME407
Manufacturing
Processes Lab


2
30
20
50
1
BTME408
Theory of Machines
Lab


2
30
20
50
1
Advisory
Meeting


1





General
Fitness



1
00

100

Total
Week

2
Thin cylinders and spheres: Calculation of Hoop stress, longitudinal stress in a
cylinder, effects of joint
s, change in diameter, length and internal volume.
Principal stresses in sphere, change in diameter and internal volume.
Week

3
Shear stress distribution in rectangular, circular, I, T and channel sections,
Week

4
Shear stress distribution in
B
uilt u
p beams. Shear centre and its importance.
Week

5
Strain energy

Introduction to strain energy, energy of dilation and distortion.
Resilience, stress due to suddenly applied loads.
Week

6
Castigliano’s theorem, Maxwell’s theorem of reciprocal deflectio
n.
Week

7
Open and closed coiled helical springs under the action of axial load and/or
couple.
Week

8
Flat spiral springs

derivation of formula for strain energy, maximum stress and
rotation. Leaf spring

deflection and bending stresses
Week

9
Thic
k Cylinders :
Derivation of Lame’s equations, calculation of radial,
longitudinal and hoop stresses and strains due to internal pressure in thick
cylinders, compound cylinders
.
Week

10
H
ub shrunk on solid shafts, shrinkage allowance and shrinkage stress.
Week

11
Bending of curved beams :
Calculation of stresses in cranes or chain hooks, rings of
circular and trapezoidal section
Week

12
Bending of curved beams:
chain links with straight sides.
Week

13
Rotational stresses in
rotating discs and rims of
uniform thickness
Text Books
Book 1
Strength of Materials by
S
.
S
. Rattan
,
Tata
McGraw Hill, New Delhi
Book 2
Strength of Materials by D.S.Bedi, Khanna book Publishing Company, New
Delhi
Reference Books
Book 3
Strength of Materials by GH Ryder,
III rd Edition, MACMILL
AN
Book 4
Mechanics of Materials

Sl version 2
nd
Edition by EP Popov, Prentice Hall
Inc.
Distribution of Syllabus in various books
Sr.
No.
Topic
Chapters
No. of
classes
Book 1
Book 2
1
Strain energy
Ch

3
Ch

1
2
8
2
Theories
of Failure
Ch

15
Ch

1
3
5
3
Leaf spring, open coiled helical springs and flat
spiral springs
Ch

11
Ch

1
1
7
4
Thi
n
Cylinders
Ch

1
3
Ch

9
5
5
Thick Cylinders
Ch

1
3
Ch

1
0
7
6
Bending of curved beams
Ch

9
Ch

14
6
7
Shear
ing
stress distribution, Importance o
f shear
centre
Ch

6
Ch

5
7
8
Rotational stresses in discs and rims of uniform
thickness; discs of uniform
strength
Ch

14
Ch

15
7
Total Classes
52
BT
ME

40
2
THEORY OF MACHINES
–
II
Syllabus to be covered week
wise
Week

1
Static equilibrium of mechanism, concept of force and couple, free body
diagram, condition of equilibrium
Week

2
Methods of static force analysis of simple mechanisms and power transmis
sion
elements, considerations of frictional forces
Week

3
Determination of forces and couples for a crank, inertia of reciprocating parts,
dynamically equivalent system, analytical and graphical method,
Week

4
Inertia force analysis of basic engine mech
anism torque required to overcome
inertia and gravitational force of a four bar linkage.
Week

5
Classifications, need for balancing, balancing of single and multiple rotating
masses, static and dynamic balancing, primary and secondary balancing for
recipr
ocating masses,
Week

6
partial balancing of locomotives, swaying couple, hammer blow, variation in
tractive effort, balancing of V

engine, concept of direct and reverse crank,
balancing of machines, rotors, reversible rotors.
Week

7
Toothed gears and sp
ur gears, types of toothed gears, definitions, pitch circle
diameter, pitch surface, pitch point, circular pitch, module pitch, diametrical
pitch, addendum, Dedendum clearance, outside and internal diameters, root
diameter, base circle diameter, face and f
lank of tooth, pressure angle, path of
contact, arc of contact,
Week

8
Conditions for correct gearing, forms of teeth, involute and its variants,
interference and methods of its removal. Calculation of minimum no of teeth
on pinion/wheel for involute rac
k, helical/spiral/bevel/worm gears.
Week

9
Center distance for spiral gears and efficiency of spiral gears Types of gear
trains, simple, compound and problems involving their applications
Week

10
Epicyclic gear trains, problems involving their applicatio
ns, estimation of
velocity ratio of worm and worm wheel.
Week

11
Effect on supporting and holding structures of machines,
Week

12
Effect on 2 and 4 wheeled vehicles
Week

13
Freudenstien equation, Function generation errors in synthesis
Two/three point
synthesis, Transmission angles, least square techniques,
Distribu
tion of Syllabus in various books
BT
ME

403
FLUID MECHANICS

I
Syllabus to be covered week wise
Text Books
Book 1
Theory of Machines by S.S. Rattan
Book 2
Theory of Machines

II by DR & NK Malhotra Satya Prakashan New Delhi.
Reference Books
Book 3
Theory of Machines by V.P.Singh
Sr. No.
Topic
Chapters
No of Classes
Book 1
Book 2
1
Static force analysis
12
3
8
2
Dynamic force analysis
13
3
8
3
Balancing
14
6
9
4
Gears
10
1
10
5
Gear Trains
11
2
8
6
Gyroscopic motion and
gyroscopic coupl
es
17
5
8
7
Kinematic synthesis of
Mechanism

4
4
Total Classes
55
Week

1
Fluid and their properties: Concept of fluid, difference between solids, liquids and
gases; ideal and real fluids; c
apillarity, vapour pressure, compressibility and bulk
modulus; Newtonian and non

Newtonian fluids.
Week

2
Concept of pressure, Pascal’s law and its engineering applications, hydrostatic
paradox. Action of fluid pressure on a plane (horizontal, vertical a
nd inclined)
submerged Surface, resultant force and center of pressure.
Week

3
Force on a curved surface due to Hydrostatic pressure. Buoyancy and flotation,
stability of floating and submerged bodies, metacentric height and its determination.
Week

4
Per
iodic time of oscillation, pressure distribution in liquid subjected to constant
horizontal/ vertical acceleration, rotation of liquid in a Cylindrical container.
Week

5
Classification of fluid flows, velocity and acceleration of fluid particle, local and
convective acceleration, normal and tangential acceleration, streamline, path line
and streak line, flow rate and discharge mean velocity
Distribution of Syllabus in various books
Week

6
Continuity equation in Cartesian and cylindrical, polar coordinates, Rotational
flows.
Week

7
Rotation velo
city and circulation, stream and velocity potential Functions flow net.
Week

8
Euler’s equation, Bernoulli’s equation and steady flow energy equation;
牥灲pse湴慴楯渠潦nergy c桡nge猠楮汵s搠dy獴敭⸠
Week

9
Impulse momentum equation, Kinetic energy and
momentum correction factors,
flow along a curved streamline.
Week

10
Free and forced vortex motions, Fundamental and derived units and dimensions,
dimensional homogeneity
Week

11
Rayleigh’s and Buckingham’s Pi method for dimensional analysis. Dimensio
湬敳猠
湵浢敲猠a湤n瑨敩t 獩s湩晩na湣eⰠge潭e瑲楣Ⱐ歩湥浡瑩c a湤ndy湡浩c 獩s楬a物ryⰠ浯摥m
獴畤se献sia浩湡爠r湤⁔畲扵b
e湴⁆汯睳l⁆汯眠leg業e猠s湤⁒ey湬潤
湵浢n爮r
Week

12
Critical velocity and critical Reynolds number, laminar flow in circular cross

sectio
n pipes. Turbulent flows and flow losses in pipes, Darcy equation, minor head
losses in pipes and pipe fittings, hydraulic and energy gradient lines.
Week

13
Flow Measurement: Manometers, pitot tubes, venturi meter and orifice meters.
Orifice, mouthpieces
, notches and weirs, Rotameter.
Text Books
Book 1
A Textbook of Fluid Mechanics by Bansal RK; Laxmi Publications Pvt. Ltd.,
New Delhi
Book 2
Fluid Mechanics and Fluid Power Engineering by Kumar DS; SK
Kataria and Sons, New Delhi
\
Reference Books
Boo
k 3
Fluid Mechanics by Douglas JF, Poitman
Sr. No.
Topic
Chapters
No of
Classes
Book 1
Book 2
1
Fluid and their
properties
1
1, 2
04
2
Fluid Statics
2, 3, 4
3
12
3
Fluid Kinematics
5
4
12
4
Fluid Dynamic
s
7
4
10
5
Dimensional analysis
and Similitude
6
6
08
6
Flow Measurement
2, 8
14
08
Total Classes
54
BTME404
APPLIED THERMODYNAMICS
–
II
Syllabus to be covered week wise
Week

1
Introduction and general classification of rotary compressors; comparis
on of rotary
compressors with reciprocating processors; operation of positive displacement type
of rotary compressors like roots blower, Lysholm compressor and Vane type
Blower. Applications of Steady Flow Energy Equation and thermodynamics of
Rotary compr
essors; stagnation and static values of pressure, temperature and
enthalpy etc. for flow through rotary machines.
Week

2
Complete representation of compression process on T

S coordinates with detailed
description of areas representing total work done an
d Polytropic Work done, area
representing energy lost in internal friction, energy carried away by cooling water
etc. on
T

S coordinates for uncooled and cooled compression, Isentropic, polytropic and
isothermal efficiencies as ratios of areas representi
ng various energy transfers T

S
coordinates.
Week

3
Complete thermodynamic anlysis of centrifugal compressor stage, polytropic,
isentropic and isothermal efficiencies; complete representation of compression
process starting from ambient air to flow throug
h suction pipe, impeller, diffuser
and finally to delivery pipe on T

S coordinates; preguide vanes and prewhirl; Slip
factor, power input factor; various modes of energy transfer in impeller and diffuser;
Week

4
Degree of reaction and its derivation; en
ergy transfer in backward, forward and
radial vanes; pressure coefficient as a function of slip factor, efficiency and
outcoming velocity profile from the impeller. Derivation of non

dimensional
parameters for plotting compressor characteristics; centrifug
al compressor
characteristics curves; surging and choking in centrifugal compressors.
Week

5
Different components of axial flow compressors and their arrangement; discussion
on flow passages and simple theory of aerofoil blading; angle of attack; coeffici
ents
of lift and drag; turbine versus compressor blades; velocity vector vector diagrams,
thermodynamic analysis and power calculations; modes of energy trasfer in rotor
and stator blade flow passages. Detailed discussion on work done factor;
Week

6
Degr
ee of reaction and Blade efficiency and their derivations; Isentropic, polytropic
and Isothermal Efficiencies. Surging, choking and stalling in axial flow
compressors, characteristics curves for axial flow compressor, flow parameters of
axial flow compress
or like pressure coefficient, flow coefficient, work coefficient
and temperature rise coeffieicnt specific speed etc. Comparison on axial flow
compressor with centrifugal compressor and reaction turbine; field of application of
axial flow compressors.
We
ek

7
Comparison of open and closed cycles; comparison of gas turbine with a steam
turbine and IC engine. Fields of application of gas turbine. Position of gas turbine in
power industry; classification on the basis of system of operation (open and closed
cy
cles) and on the basis of combustion (at constant volume or constant pressure)
Distribution of Syllabus in various books
Thermodynamics of constant pressure ga
s turbine cycle (Brayton cycle)
Week

8
Brayton cycle
:
calculation of net output, work ratio and thermal efficiency of ideal
and actual c
ycles; cycle air rate, temperature ratio; effect of changes in specific heat
and of mass of fuel on power and efficiency; Operating variables and their effects
on thermal efficiency and work ratio.
Week

9
Thermal refinements and their effects on gas turbi
ne cycle i.e. gas turbine cycle with
regeneration, inter

cooling and reheating; multistage compression and expansion;.
Week

10
Dual Turbine system; Series and parallel arrangements, closed and semi

closed gas
turbine cycle; requirements of a gas turbine c
ombustion chamber. Blade materials
and selection criteria for these materials and requirements of blade materials. Gas
turbine fuels
Week

11
Principle of jet propulsion, description of different types of jet propulsion system
like Rockets and thermal jet
engines like (I) athodyds (ramjet and pulsejet), (ii)
turbojet engine, (iii) turboprop engine. Thermodynamics of turbojet engines
components; development of thrust and methods for its boosting/augmentation
Week

12
thrust work and thrust power, propulsion
energy, propulsion and thermal (internal)
efficiencies, overall thermal efficiency. Specific fuel consumption Rocket
propulsion, its thrust and thrust power; propulsion and overall thermal efficiency,
types of rocket motors (e.g. solid propellant and liqui
d propellant systems)
Week

13
various common propellant combinations (i.e. fuels) used in rocket motors; cooling
of rockets Advantages and disadvantages of jet propulsion over propulsion systems;
Brief introduction to performance characteristics
of differ
ent propulsion systems
fields of
application of various propulsion units.
Text Books
Book 1
Heat Engineering by VP Vasandani and DS Kumar; Metropolitan Book Co. Pvt
Ltd., Delhi
Book 2
Thermodynamic and Heat Engines, Vol II by R Yadav .
Reference B
ooks
Book 3
. Gas Turbine Theory by Cohen H and Rogers GFC and Sarvan matto
Longmans
Book 4
Fundamentals of IC Engines by Heywood; McGraw Hill
Unit
Topic
Chapters
No of
Classes
Book 1
Book 2
BTME405
MANUFACTURING PROCESSES

II
Syllabus to be covered
w
eek wise
Week

1
Introduction
: Classification of forming processes, Rolling: Classification of
rolling processes, rolling mills, products of rolling and main variables, rolling
defects.
Week

2
Drawing: Drawing of rods, wires and tubes, Draw benches, m
ain variables in
drawing operations.
Week

3
Forging
: Open and closed die forging, forging operations, hammer forging, press
forging and drop forging, forging defects, their causes and remedies.
Week

4
Extrusion: Classification of extrusion processes, e
xtrusion equipment, variables
in extrusion process.
Week

5
Introduction to high velocity forming
. Sheet metal forming operations:
Spinning, Press working tools.
Week

6
Deep drawing, bending. Introduction to press working. Types of presses, press
working
operation,
Week

7
Introduction to powder metallurgy:
methods of producing powders
Week

8
Briquetting and sintering, sizing and finishing operations
Week

9
Cutting tool materials, high carbon steels, alloy carbon steels, high speed steel,
cast alloys,
cemented carbides, ceramics and diamonds, CBN etc.
Week

10
Geometry of single point cutting tools, Twist Drill and milling cutter, cutting
speeds and feeds
Week

11
Coolants:
Classification, purpose, its effect on speed and feed Lubricants:
Function and
properties Lathe: Machine and its accessories, Lathe operations,
Turning,
1
I C Engines
Ch

1
Ch

1
12
2
Rotary Compressors
Ch

2

08
3
Centrifugal Compressors

Ch

3
08
4
Axial Flow Compressors
Ch

4

08
5
Gas Turbines
Ch

5

12
6
Jet Propulsion

Ch

6
08
Total Classes
56
Week

12
Taper Turning and Thread cutting, kinematic scheme of lathe, shaping and
planning Machine, Drive Mechanisms, slotting machine, cutting speeds and
feeds
Week

13
Milling
machine and its classification
, up milling and down milling Indexing:
Simple compound and differential Sawing Machine and Drilling Operation
Boring Operation and boring machines. Grinding: Cylindrical, surface and
centreless grinding. Composition and nomen
clature of grinding wheels
Introduction to broaching machine
Distribution of Syllabus in various books
Text Books
Book 1
Production Technology by P.C.Sharma
Book 2
Manufacturing Technology: Foundry, Forming and Welding by Rao, Tata
McGraw Hill, New Delhi.
Reference Books
Book 3
Principle
s of Manufacturing Materials and Processes by J.S. Campbell, Tata
McGraw Hill.
Sr. No.
Topic
Chapters
No of
Classes
Book 1
Book 2
1
Extrusion
Forging


02
2
Drawing
Rolling
Ch

1
Ch

1
08
3
Introducti
on to high
velocity forming

Ch

2
07
4
Metal Forming
Ch

3

07
5
Metal cutting and
Machine tools

Ch

3
07
6
Introduction to powder
metallurgy,
Ch

4

07
BT
ME

408
THEORY OF MACHINES LAB
List of Experiments
1.
To draw displacement, velocity & acceleration di
agram of slider

crank and four bar
mechanism.
2.
To study the various inversions of kinematic chains.
3.
Conduct experiments on various types of governors and draw graphs between height and
equilibrium speed of a governor.
4.
Determination of gyroscop
ic couple (graphical method).
5.
Balancing of rotating masses (graphical method).
6.
Cam profile analysis (graphical method)
7.
Determination of gear

train value of compound gear trains and epicyclic gear trains.
8.
To draw circumferential and axial p
ressure profile in a full journal bearing.
9.
To determine coefficient of friction for a belt

pulley material combination.
10.
Determination of moment of inertia of flywheel.
BTME

406
FLUID MECHANICS

I LAB
List of Experiments
1.
To determine the met
acentric height of a floating vessel under loaded and unloaded conditions.
2.
To study the flow through a variable area duct and verify Bernoulli’s energy equation.
3.
To determine the coefficient of discharge for an obstruction flow meter (venturi meter
/ orifice
meter)
4.
To determine the discharge coefficient for a V

notch or rectangular notch.
7
Milling machine and its
classification,
Ch

5

04
8
Sawing Machine and
Drilling Operation

Ch

6
04
9
Boring Operation and
boring machines

Ch

7
04
10
Grinding: Cylindrical,
surface and centreless
grinding
Ch

7

04
Total Classes
56
5.
To study the transition from laminar to turbulent flow and to ascertain the lower critical
Reynolds number.
6.
To determine the hydraulic coefficients for
flow through an orifice.
7.
To determine the friction coefficients for pipes of different diameters.
8.
To determine the head loss in a pipe line due to sudden expansion/ sudden contraction/ bend.
9.
To determine the velocity distribution for pipeline
flow with a pitot static probe.
10.
Experimental evaluation of free and forced vortex flow
BT
ME

408
MANUFACTURING PROCESSES

II LAB
List of Experiments
1.
To determine clay content, moisture content, hardness of a moulding sand sample.
2.
To determine
shatter index of a moulding sand sample.
3.
To test tensile, compressive, transverse strength of moulding sand in green condition.
4.
To determine permeability and grain fineness number of a moulding sand sample.
Welding:
1.
To make lap joint, butt joi
nt and T

joints with oxy

acetylene gas welding and manual arc
welding processes
2.
To study MIG, TIG and Spot welding equipment and make weld joints by these processes.
Machining and Forming
1.
To study constructional features of following machines t
hrough drawings/ sketches:
a. Grinding machines (Surface, Cylindrical)
b. Hydraulic Press
c.
Draw Bench
d. Drawing and Extrusion Dies
e. Rolling Mills
2.
To grind single point and multipoint cutting tools
3.
To prepare job on Lathe involving specif
ied tolerances; cutting of V

threads and square
threads.
4.
To prepare job on shaper involving plane surface,
5.
Use of milling machines for generation of plane surfaces, spur gears and helical gears; use of
end mill cutters.
6.
To determine cutting fo
rces with dynamometer for turning, drilling and milling operations.
Enter the password to open this PDF file:
File name:

File size:

Title:

Author:

Subject:

Keywords:

Creation Date:

Modification Date:

Creator:

PDF Producer:

PDF Version:

Page Count:

Preparing document for printing…
0%
Σχόλια 0
Συνδεθείτε για να κοινοποιήσετε σχόλιο