Constrocops Design Services

Constrocops Design Services Constrocops is a group of highly inspired engineers. We provide training and services which help y

We provide training and services which help you design better.

21/11/2013

What is the difference between
scavenging and supercharging ?
Ans: Scavenging is process of flushing
out burnt gases from engine cylinder
by introducing fresh air in the
cylinder before exhaust stroke ends.
Supercharging is the process of
supplying higher mass of air by
compressing the atmospheric air.
2.What is pitting ? How it is caused ?
Ans: Non uniform corrosion over the
entire metal surface, but occuring
only in small pits is called pitting. It
is caused by lack of uniformity in
metal.
3.Why large boilers are water tube
type ?
Ans: Water tube boilers raise steam
fast because of large heat transfer
area and positive water circulation.
Thus they respond faster to
fluctuations in demand. Further
single tube failure does not lead to
catastrophy.

20/11/2013

1.). What is boundary layer ?
Ans.-Boundary layer is the fluid layer
in the neighborhood of a solid
boundary where the effects of fluid
friction are predominant.
2.)What is meant by precision ?
Ans.-Precision is defined as the
ability of instrument to reproduce a
certain set of readings within a given
accuracy.
3.)What is the difference between
path line and stream line ?
Ans.-A path line is a curve traced by
a single fluid particle during its
motion. A stream line is an imaginary
line drawn in a flow field such that a
tangent drawn at any point on this
line represents the direction of the
velocity vector. There is no flow across
the stream line.
4.). What is the difference between
steady and unsteady flow ?
Ans.-In steady flow the velocity at a
given point does not change with
time whereas in unsteady flow it
changes with time.

19/11/2013

1.)What is vapour pressure and when
it becomes important ?
Ans: Vapour pressure is the partial
pressure created by the vapour
molecules when evaporation takes
place within an enclosed space. It
becomes important when negative
pressures are involved.
2.). Explain absolute viscosity ?
Ans: It is the ratio of shear stress
and the gradient of velocity with
distance between a fixed plate and
moving plate (Its unit is Pa . s).
3.)What is the difference between
perfect and real fluids ?
Ans: Perfect fluids are treated as if all
tangential forces created by friction
can be ignored.
Real fluids refer to the cases in which
friction must properly be taken into
account.
4.)State Archimedes principle.
Ans: Any weight, floating or immersed
in a liquid, is acted upon by a
buoyant force equal to the weight of
the liquid displaced. This force acts
through the center of buoyancy, i.e.
the e.g. of the displaced liquid.

13/11/2013

CLEAR YOUR CONCEPT:-
What is the difference between
Moment and Couple?
• Moment of force is the measure of
turning effect of a force about a
point. A couple consists of two equal
and opposite forces acting with two
different but parallel lines of action.
Each force has its own moment.
• Moment of a force is dependent on
the distance from the pivot and the
magnitude of the force while the
moment of a couple is the net effect
of the two moments of the forces.
Moment of a couple is independent
of the location of the point
considered. It is constant throughout
the plane. The resultant moment of a
couple is called a torque.
• Torque, also called moment or
moment of force, is the tendency of a
force to rotate an object about an
axis, fulcrum, or pivot. Just as a force
is a push or a pull, a torque can be
thought of as a twist.
Couple - Two equal but opposite
forces
Torque - Moment of a couple

12/11/2013

1.)When Coriolis component is
encountered ?
Ans: When a point moves along a
path that has rotational motion.
2.)What is the difference between
mechanical advantage and velocity
ratio ?
Ans: Mechanical advantage is the
ratio of load lifted and the effort
applied. Velocity ratio is the ratio
between the distance moved by the
effort applied and the distance
moved by the load lifted.
3.)What happens if gasoline is used
in a Diesel engine?Diesel engine will
work ?
Ans:No, It will not work,as the
Compression ratio of Petrol engine is
6 to 10 & that of Diesel engine is 15
to 22. Thus on such high
compression, gasoline gets highly
compressed & it may blast.
4.)What is Difference between
Hardness and Toughness?
Ans. Toughness is the ability of a
material to absorb energy.
Hardness is the ability of a material
to withstand wear.

11/11/2013

Some things only engineers can
understand(JUST FOR FUN):
1) Only an Engineer understands that
he knows nothing: The 4 years of
college and hostel life with rotten
food from the mess, and late night
movies, irritating teachers, pointless
lectures and zero knowledge with a
certificate are all an engineer gets
out of his undergraduate life.
2) Free Wi-Fi: To a true engineer, a
free Wi-Fi gives more happiness than
his monthly salary credited twice to
his account. It is an uncertified fact
that engineers can survive anywhere
with a smartphone, laptop and a
stable Wi-Fi connection as their
entire life right from college has
been spent online.
3)Any question can be answered: This
set of the population alone believes
in the saying “where there is a
question, there is an answer”. They
are the only set of people who very
well know that the answer they write
in exam is nothing but nonsense, and
that the examiner puts pass marks for
the same.
P.S: Add your own points in the
comments and tag your friends.

06/11/2013

True Story:
In bed,its 6:00 am, if u close ur
eyes for 5 minutes,
its direct 7:45
but
in lecture its 12:30, u close ur eyes
for 5 minutes,
its stil 12:31 ..
Agree ??

06/11/2013

What is the hottest part of
Refrigerant in Refrigeration?
Ans.Compressor
2.)What does F.O.F Stand for Piping
Design?
Ans.Face of Fl**ge, The F.O.F (Raised
face and Flat face) is used to know
the accurate dimension of the fl**ge
in order to avoid the minute errors in
measurement in case of vertical or
horizontal pipe lines.
3.) Difference between Performance
and Efficiency?
Ans.The accomplishment of a given
task measured against preset known
standards of accuracy, completeness,
cost, and speed is called as
Performance.
Efficiency is defined as the input
given and the work obtained from
that input like money, time, labour
etc. It’s the main factor of
productivity.

04/11/2013

INTERVIEW QUESTIONS :-
1.)Distinguish between creep and
fatigue.
Ans: Creep is low and progressive
deformation of a material with time
under a constant stress at high
temperature applications. Fatigue is
the reduced tendency of material to
offer resistance to applied stress
under repeated or fluctuating loading
condition.
2.)What is bending moment?
Ans.-A bending moment is a measure
of the average internal stress induced
in a structural element when an
external force or moment is applied
to the element causing the element
to bend.
3.)Who invented the four-stroke
engine?
Ans.-Nikolavs August Otto, German
4.)Define hydraulically efficient
channel cross section.
Ans: The shape of such section is
that which produces minimum wetted
perimeter for a given area of flow and
carries maximum
flow.

03/11/2013

QUESTION:-
Heat transfer by radiation mainly
depends upon
(a) its temperature
(b) nature of the body
(c) kind and extent of its surface
(d) all of the above
(e) none of the above

03/11/2013

Traffic police chalan book nikaal ke
bola :
'Naam bol ?'
Ladka :
Galti ho gayi Sir...
Police :
Naam Bol
Ladka :
Sorry sir Iss baar jane do dobara
nahi hoga
Police :
Abe Naam bolta hai ki bike detain
karu..
Ladka :
"Trikulavattyy Thekkeparambli
Venkateshwara Swami"
Police (book band karke) : chal nikal
beta !
Agli baar gaadi dhire chalana !!!

Address

Sec-34 , Gurgaon
Gurugram
122101

Telephone

8607947194

Website

Alerts

Be the first to know and let us send you an email when Constrocops Design Services posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Business

Send a message to Constrocops Design Services:

Shortcuts

Share

Category