babacha:


If u use ur hand to spin water that is inside bucket, u will observe that the water will move away from the center of the bucket to the edge creating a vacuum at the center. That is what centrifugal pump does, the empeller spin the fluid and a vacuum is created at the center of the empeller for more fluid to come in. That is why u have ur suction at the center of the empeller.
From simple harmonic motion, the velocity of object in circular part is usually tangential to the circumference, that is why the discharge is always tangential to a particular point on the circumference of the empeller.

Draw a circle, draw a tangential Line to any point on the circumference of the circle, from the point of tangent, draw a line to the center of the circle. Ur 90 degree will appear. The tangential line is the discharge and the center of ur circle is the suction.
Hope is clear?

babacha:


Let me tell u how the fuel or diesel move in 4 stroke engine

From the tank, the fuel move along the hose to the primary fuel filter, from the primary it move to the secondary fuel filter (if the engine has two fuel filter), from the fuel filter to the injector pump, from injector pump to nozzle, from nozzle to combustion chember,.
If air should enter ur fuel line, ur fuel pump will not work effectivly and ur engine will go off. That is why mechanic bleed the fuel line to remove any air trap.
So fuel and air no dey mix with 4 stroke engine before they enter the chember

GeneralSnipper:


Oga! Get it clear, there are four stroke petrol engines that use carburetor. Look for an old Peugeot 504 engine and you'll see it. We are all here to learn bro..........

I can see you have some good mechanical knowledge, nice one. Here are some questions for your attention

1.) If an engine is not designed to be water cooled (i.e. no radiator) what other means can be used to cool it? Explain the principle behind it.

2.) Why does a two stroke engine generates more smoke than a four stroke engine?

3.) A pump comes alive when powered on but it's not pumping, what could be the problem?

gbonsquare:

Oga u tried but you should have given detailed explaination of fractional distillation and d fractions obtained with d temp at which they distilled off to make it impressive.From d questions u were asked i guess u are a chemical/process Engr...Thanks bro.

uyosolo:
@caucasian,r u fightin against flesh nd blood or principalities nd power? U seriously nid help!!! Ur village ppl hv troubled u too much

Caucasian:
What ? ? three against one ?? Well, i am more than equal to the task. But u sounded very funny with your AKWA IBOM accent. try something else.

uyosolo:

mbok!!! yakmaiiii... Who release dis one 4rm cage...u nid to be tied up&beaten,to drive all doz evil spirits in u...so dat u wunt end up in 14yrs jail,bcs of d type of job u r lukin 4

babacha:


We no dey challeng ourselves, we are sharing idea, throw ur question to the house not me, but let me answer ur questions.
1, Engine are iether cool with liquid or air, if there is no radiator, u use air. But there is a major disadvantage. Air has a low heat density so if the speed of ur air is low, it can only carry a small mass of heat.

2, 2 stroke engine smoke more because they burn oil. Mind u, 4 stroke engine can also produce excess smoke if the piston ring is bad. To add more, these are what causes engine to smoke
Black smoke- if ur air/fuel ratio is imbalance, ie too much fuel in the combustion chember or less air in the chember
White smoke-incomplete combustion
Blue smoke-ur engine is burning oil, ie ur piston ring is bad and oil is entering the combustion chemberl

3 a pump can be runing but not pumping due to any of the following
1, If the suction pipe is not completly filled with liquid
2, If air is leaking into the suction pipe
3, If air is leaking into the pump
4, If ur foot valve is blucked
5, If ur suction pipe is not fully submerged
6, If ur empeller is mounted wrongly
7, If ur pump is not prime
8 etc

GeneralSnipper:



Me wen be learner? I gree get power to challenge BABACHA, you see that name Only you nah chairmen.

At least all them wen dey follow you hold ground for grammar self go learn from this. Bros yeeee only you be Broses, you too much. Nice one.............

As e be so if you do mechanical key point for the house office go pay well ooo. Lol!!!

Cheers bro!

madri4u:
Dis one wen unah dey prepare so, Hope unah knw say oga jona, use dis NNPC recruitment for political vote scam tins, nw wen he don fail so and com b say buhari don com on board to sanitize NNPC so, dis recruitment fit b forgotten tin oo and new fresh advert recrutiment conducted again by buhari regime..Dose wen don pass 28yrs nor go com fit apply again ooo..which kind life self.......lol!

madri4u:
Dis one wen unah dey prepare so, Hope unah knw say oga jona, use dis NNPC recruitment for political vote scam tins, nw wen he don fail so and com b say buhari don com on board to sanitize NNPC so, dis recruitment fit b forgotten tin oo and new fresh advert recrutiment conducted again by buhari regime..Dose wen don pass 28yrs nor go com fit apply again ooo..which kind life self.......lol!

gwason:
and why is firing order of a vehicle arranged alternatively eg 1.3.4.2 and not serially eg 1.2.3.4 once ask dis question an interview..was jus swept of my feet,

gwason:
and why is firing order of a vehicle arranged alternatively eg 1.3.4.2 and not serially eg 1.2.3.4 once ask dis question an interview..was jus swept of my feet,

tunziepro:
Pls everyone, what subsidiary will a Microbiologist fit into

nke001:


Most firing orders are applied bearing in mine 'the effect of heat on efficiency of an ice/cie'. Mainly for easy dissipation of heat and better thermal expansivity/shock absorption of the block.