Upload
thulasi-ram
View
213
Download
0
Embed Size (px)
Citation preview
8/20/2019 Auto Mobile Notes Basics
http://slidepdf.com/reader/full/auto-mobile-notes-basics 1/8
What is Automobile engineering or Modern automotive engineering ?::Modern
automotive engineering is a branch of vehicle engineering, incorporating elements of
mechanical, electrical, electronic, software and safety engineering as applied to the design,
manufacture and operation of motorcycles, automobiles, buses and trucks and their respective
engineering subsystems
Describe the similarities between a four stoke engine and a two stroke engine.::Bothrun according to the four-cycle formula of induction, compression, explosion, and exhaust.
(lso known as suck, s!uee"e, bang, blow.#
$n the four stroke engine these all take place in the same place, at different times. $n the two
stroke engine, part of the process takes place in the space underneath the piston.
Both engines are usually made of metal components, use hydrocarbon fuels and lubricants,
use an air or li!uid cooling system,most usually use an electrical spark to provide ignition -
though there are variants of both types that use compression to achieve the re!uired
temperature, make noise, create pollution, and provide power. %ypically the power
characteristics of the two types are somewhat different.
Are unit pump & unit injector used in modern diesel engine powered
automobiles?::$n diesel engine fuel supply systems, unit pump & unit in'ector are operated by camshaft & hence pressure of in'ected fuel depends on engine speed. hereas, in common
rail systems its independent of engine speed. )till, are unit pump & unit in'ector used in
modern automobiles*
Why the handle of screw driver is made of plastic::plastic is a non-conductor material
so it is safe for electricity. furthermore plastic is cheap and relatively strong if you consider it
is held by your hand and nothing more damaging is happening to it. plastic does not bend if
you put power to the screwdriver so it will stand until it cracks. the more expensive
screwdrivers use strong rubber so you have all the above pros plus it does not slip.
What are the reasons for a steel cap piston to seie in a four stroke diesel
engine::part from overheating $+d suggest carbon build up from an unsuitable fuel or an
in'ector problem. ust a guess, $+m no expert on diesels, 'ust repeating what $ have read.
What is the difference between white lithium grease and lithium grease other than
its color? Any difference in properties? or use?::the white one is eatable.where i work we
use it on the machine that fills the bottles with water. $t is far more expensive than the simple
lithium grease
!ow many ferrari Mondial " were e#ported to $%A in ''(::Mondial
Mondial /uattrovalvole
Mondial 0abriolet
Mondial t
where produced from 123 till 1224 and the production number reached the 533 units and
was one of 6errari+s most commercially successful models the production for Mondial %
went form 122 to 1224
What happens if gasoline is used in a Diesel engine?Diesel engine will work ?
7o, $t will not work,as the 0ompression ratio of 8etrol engine is ) to * & that of 9iesel
engine is + to ((. %hus on such high compression, gasoline gets highly compressed & it may
blast.
Which Mechanism is used in Automobile gearing system
8/20/2019 Auto Mobile Notes Basics
http://slidepdf.com/reader/full/auto-mobile-notes-basics 2/8
9ifferential mechanism
Why different types of sound are produced in different bikes though they say run on %, engine
ngine specifications are different in different manufactures like as Bore 9iameter(00#,
$gnition timing.lso the exhaust passage take more responsible for sound.
Why entropy decreases with the increase in temperature?
ds-d/"ntropy is inversely proportional to the temperature so.as temp. increases,entropy
decreases.
hp how much watt?
;<5.=att
!ow to calculate bearing number to diameter of the inner and outer
9ivide the shaft diameter si"e by >, it will give last two digitof the bearing no. and according
to type of load we have tochose the type of bearing and that will give prior no. ofthe bearing.
0#plain 1icycle rear wheel %procket working?
?ear wheel sprocket works under the principle of ratchet and pawl.
Definition of 2ctane number & 3etane number
@ctane 7o.- @ctane number is defined as the percentage, by volume, of iso octane in themixture of iso octane and h-heptane. $t is the measure of rating of )$ engine.
0etane 7o.- 0etane number is defined as the percentage, by volume, of n-cetane in the
mixture of n-cetane and alpha methyl naphthalene. $t is the measure of rating of 0$ engine.
4oisons ratio is higher in 5rubber/steel/wood6
hen a material is compressed in one direction, it usuallytends to expand in the other two
directions perpendicular tothe direction of compression. %his phenomenon is called
the8oisson effect. 8oissonAs ratio is a measure of the 8oisson effect.
6or rubber 3.>
6or steel 3.=
6or wood C 3.=
%hus 8oissonAs ratio is higher in ?DBB?.
"he 7atigue life of a part can be improved by ?
$mproving the surface finish by 8olishing & providing residual stress by )hot peening.
8/20/2019 Auto Mobile Notes Basics
http://slidepdf.com/reader/full/auto-mobile-notes-basics 3/8
When crude oil heated Which !ydro carbon comes first?
7atural gas(Easoline#F at =3 0elsius
• hp-how much rpm
e need %or!ue to find out.
pply this formula:
% G8 x >=>=
rpm
% tor!ue (in lb-ft#
G8 horsepower
>=>= constant
rpm revolutions per minute
• which mechanism is used in automobile gearing system
9ifferential mechanism
• why different types of sound are produced in different bikes though they say run
on %, engine
ngine specifications are different in different manufactures like as bore diameter(cc#,ignition
timing.lso the exhaust passage take more responsible for sound.
• why entropy decreases with the increase in temperature?
dsd/H%
ntropy is inversely proportional to the temperature so.as temp. increases,entropy decreases
• What type of metal is used in a propeller
luminium,stainless steel,magnesium bron"e,7$B?I(nickel,brass,aluminium#
• why involute curve used in gear
1# itAs smooth to drive the gear.
=# in gears contact is only point, this type is curve take the more load than normal one
• !ow "rains take turns8 though there is no any differential
8urpose of the differential is to enable vehicles to take turn, by allowing both the wheel to
rotate with different speed. %his is re!uired when wheels, like in car, are connected with same
axle. $nterestingly, wheel in trains are not connected with the axle, they are independent and
8/20/2019 Auto Mobile Notes Basics
http://slidepdf.com/reader/full/auto-mobile-notes-basics 4/8
hence can take turns without ant differential. %his is same as how the bullock cart takes turns,
without any differential.
• Why freeer in the fridge is placed in top level?
Because density of cold air is higher than warm air,hence itis placed at top.0old air comesdownward & cool the bottom part.
• what is more dangerous longitudinal stress or !oop stress and why?
Goop stress is more dangerous thanlongitudinal stress, because the dangerous area coming
underthe hoop stress is circumferential,while in longitudinal,theaxial area will come under
dangerous area will will be lessthan circumferential area.)o the hoop stress is more
dangerous than longitudinal stress
"he purpose of jigs and fi#tures are to
a. $ncreased production rate
b. $ncreased machining accuracy
c. 6acilitate interchangeable manufacturing
d. nable employ less skilled operators
e. ll of the above
Answer9
All of the above
(. Which one of the following methods produces gear by generating process
a. Gobbing
b. 0asting
c. 8unching
d. Milling
e. Broaching
Answer9
!obbing
8/20/2019 Auto Mobile Notes Basics
http://slidepdf.com/reader/full/auto-mobile-notes-basics 5/8
8/20/2019 Auto Mobile Notes Basics
http://slidepdf.com/reader/full/auto-mobile-notes-basics 6/8
Answer9
"hickness of clearance
What kind of salary are you looking for?
"ips for this <uestion9
loaded !uestion. nasty little game that you will probably lose if you answer first. )o, do
not answer it. $nstead, say something like, %hatAs a tough !uestion. 0an you tell me the range
for this position* $n most cases, the interviewer, taken off guard, will tell you. $f not, say that
it can depend on the details of the 'ob.
Answer samples
1. )ir, salary is very secondary. hat matters is you are providing me (given i clear thisinterview# with the kind of work $ have always wanted to do and the kind of work
environment too.
=. $ am looking for the kind of salary that $ can not only live on, but en'oy life with as well. $
donAt want to be the person who works 'ust to pay bills and have hardly anything left for
myself. $ donAt know about anyone else, but when $ look for a 'ob, it has to meet my needs
both mentally and money-wise or $ donAt take the 'ob.
Why do you think you would do well at this job?
Answers samples
Eive several reasons and include skills, experience and interest.
1. $ am a person that learn !uickly and perform better under pressure, am a very good team
player that motivate others in other to achieve the companyAs common goals
=. ill do well in this 'ob because $ already have previous experience in the similar field. so $
will use my previous experience in this 'ob and $ am interested in learning new things and
enhance my skills.
4. $ believe $ will do well in this 'ob because $ have the relevant skills and experience. $ alsohave the drive, interest and determination to make a real success of this role.
What motivates you to do your best on the job?
Answer tips
%his is a personal trait that only you can say, but good examples are: 0hallenge,
chievement, ?ecognition
6or any person motivation is the main factor which should make him work in an efficient
manner.
8/20/2019 Auto Mobile Notes Basics
http://slidepdf.com/reader/full/auto-mobile-notes-basics 7/8
nd that motivation could be done my some rewards for doing good 'ob, some
encouragements etc. Moreover an employees good work must be acknowledged by his
employer, which would definately boost him to work more harder to get more
acknowledgements.
Answer samples
1. $ was motivated both by the challenge of finishing the pro'ects on time and by managing
the teams that achieved our goals.
=. $ want to be successful in my 'ob, both for my own personal satisfaction and for my
employer.
4. $Ave always felt that itAs important, both to me personally, and for the company and the
clients, to provide a positive customer experience.
!ow would you know you were successful on this job?
Answer tips
)everal ways are good measures: Jou set high standards for yourself and meet them. Jour
outcomes are a success. Jour boss tell you that you are successful.
Answer sample
$ m sure that $ were successful in the because any 'ob offered in your company is my dream
and $ can do any thing for my dreams. another way $ am like to do this from my heart not formoney. soF
Do you think you are over<ualified for this position?
Answer tips
?egardless of your !ualifications, state that you are very well !ualified for the position.
nswer sample: 7o. $t is not like that. $ am sure $ am the perfect candidate for this post. Jou
are taking my interview which also indicates that $ am the suitable candidate.
2ther interview tips
K 9etermine trends that is happening in your industry and how to faceHsolve them.
K ttributesHtraitsHabilities related to this 'ob and how to get them.
K ?eview 'ob specs, 'ob description in 'ob ads for this position and try to think how to prove
your capabilities.
K ?esearch the employer profile thoroughly, the aims of their recruitment and what are yourtaskHroles.
8/20/2019 Auto Mobile Notes Basics
http://slidepdf.com/reader/full/auto-mobile-notes-basics 8/8