Which material is used for propeller shaft ?why?

mohamedeltawill

 Profile Answers by mohamedeltawill Questions by mohamedeltawill

• Mar 26th, 2015

For propeller shaft you need material with high torsional rigidity as well as material that can take a lot of fatigue . you can use alloy 303 or any low carbon steel with 10-18 % chromium and 5-8 % nickel.

bhanu

• Feb 4th, 2015

Steel used as material

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How to calculate the length of capillary tube used in Refrigeration & A.C.?

fuad

• Nov 30th, 2019

Is 9 inch for 100 watt correct?
is it enough?

Nimesh Gajjar

• Sep 29th, 2016

Barensir, for referring this calculation which book I have to refer?

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What is maximum efficiency of Carnot Engine?

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bhargavmech  

 Profile Answers by bhargavmech Questions by bhargavmech

• Member Since Jul-2009 | Aug 1st, 2009

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The maximum efficiency of the carnot engine only depends on two factors:

1 - The temperature of the hot reservoir (TH)
2 - The temperature of the cold reservoir (TC)

And is given by (TH - TC) / TH « or » 1 - TC / TH So by that we can see the maximum efficiency (100%) would be when the difference of temperatures between the two reservoirs is infinite.

sagar jain

• Apr 5th, 2016

In carnot engine, working fluid is ideal gas. The only possiblity that the efficiency of carnot engine to be 100% is when the temperature of reservoir comes to absolute zero.

Rakesh Sharma

• May 24th, 2014

There is not any even a single cycle having efficiency higher than the carnot cycle efficiency it means carnot engine having 100% efficiency.

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Why we use Petrol in SI Engine & Diesel in CI Engine

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hosam_ozo  

 Profile Answers by hosam_ozo Questions by hosam_ozo

• Member Since Apr-2010 | Aug 8th, 2010

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First thing you have to know is what is called cetane and octane number.

The octane number is the percentage of octane in the mixture of fuel
The centane number is the percentage of cetane
The octane number expresses the self ignition temperature, as this no. increases the self ignition temperature increases too and this make the knock to be avoidable and the cetane no. is vice verse

**Octane no. increase self ignition increase and cetane no decrease"" SIE needs high octane no"
**Cetane no increase the octane no decrease and the self ignition temperature decrease" CIE needs this"

Case 1: SI engine we dont want the Self Ignition to be reached we use a fuel have a high octane to avoid the knock "which damage the engine"

Case 2: CI the compression ratio is too high "12:22" and this kind of engine depends essentially on the self ignition temperature so we use a fuel with high cetane no "low octane" as the high cetane "low octane" gives low self ignition temperature and that is we need in the CIE..

ABHIJAY

• Jul 10th, 2014

Si engines means spark ignition engines. With the help of spark plug, spark is produced in engine cylinder. Before this process occurs, mixture of air and fuel entered in engine cylinder during s...

PRAVIN KAD

• Aug 9th, 2011

Si engines means spark ignition engines. With the help of spark plug, spark is produced in engine cylinder. Before this process occurs, mixture of air and fuel entered in engine cylinder during suctio...

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Ajit kumar

• Jun 3rd, 2015

The most common use of Suspension in Automobile are:-

1. Di Dion tube
2. Solid axle
3. Trailing arm
Semi Independent: Torsion Beam suspension
Twist beam rear suspension
4. Double wishbone
5. Macpherson strut

Mallayya S M

• Oct 12th, 2012

Leaf spring
Coil spring
Shock absorbers

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Why we do not use same technology to start both SI/CI engine?

H G Luhar

• Apr 4th, 2016

Auto ignition temp of petrol is higher than diesel

creative

• Mar 29th, 2016

Because diesel ignite by air pressure in cylinder and also low calorific value so we cannot use spark pluge in the CI Engine

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How to design HVAC and ECM?

abdullah

• Jun 13th, 2016

You must calculate the load of the area or you can use HAP and then design the duct system.

parthiban

• Jun 8th, 2016

Using Revit MEP software

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Ankit

• Feb 9th, 2015

Stress- measure of internal resisting force applied on body per unit area.

Strain- measure of deformation produced due to deformation load.

raghu

• Jan 2nd, 2015

Resist the applied force per unit area is known as stress (force per unit area i.e pressure)

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What are different types of bearings? What are different types of rivets?

Faheem Zaman

 Profile Answers by Faheem Zaman Questions by Faheem Zaman

• May 14th, 2011

Journal and anti friction bearing r the? two general type of bearing.journal bearing operates with sliding contact ,where as anti friction bearing operates under predominantly rolling contact.and there r two types of rivet joints ,these r tabular rivets and blind rivets.

Nidhin Chandran

 Profile Answers by Nidhin Chandran Questions by Nidhin Chandran

• May 12th, 2011

you people have answered to the question "what are the different types of riveted joints?"But here the answer is sought for the different types of rivets which are as follows(they are from w...

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mahesh kolpe

• Aug 9th, 2017

The role of mechanical Engg. in industry is to working your idea and give best to your in industry and main part is take maintenance knowledge and learning manufacturing process.

neeraj

• Jul 9th, 2017

I think the role of mechanical engineer is to take the product from an idea to the finished goods.

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Why is the rear wheel of tractor larger than its front wheel?

Srinivas pilla

• May 20th, 2014

You know tractor takes less space in turnings than other vehicles like buses lorries that's why it has large space at the rare it provides best turning and more secure my advice please watch a tractor while it takes turn try. u know

akash.2929

 Profile Answers by akash.2929 Questions by akash.2929

• Aug 7th, 2009

1. Bigger wheel - more radius hence more torque.2. Bigger base - for farming over fields, to reduce pressure.The front wheels are not changed to avoid unnecessary cost. Even in big carrier trucks one ...

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What is the practical difference Speed and Torque?

shank

• Dec 7th, 2013

The first cyclist gives his force alone but, the second cyclist gives his force with addition to the rider behind him.so, the second cyclist have the tendency to give more torque than first cyclist.

bhargavmech

 Profile Answers by bhargavmech Questions by bhargavmech

• Aug 20th, 2009

speed is the distance traversed per unit time.. it is a scalar quantity. torque is the vector product of distance and force..it is a vector quantity. torque= r * F where r is distance between point of...

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Why diesel is called as quality governed?

ravi

• Mar 29th, 2015

petrol - air fuel pre mixed and sent to engine. quality cannot be changed (rich or lean mix). By operating the throttle / accelerator the quantity of fuel is varied ( other than starting idling etc)....

sateesh

• Mar 18th, 2015

Basically petrol engines are quantity governing b coz , in this case fuel is mixed in the carburetor , so to change the speed we need to control the quantity of mixture that is going in the cylinder....

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A mass of 100kg is falling from a height of 1m and penetrates the sand to 1m. What is the resistance force of the sand?

Budi Joshi

• Mar 27th, 2015

Resistance Force=981N

Tarek

• Mar 3rd, 2015

Http://hyperphysics.phy-astr.gsu.edu/hbase/flobi.html
Please check this page.
it shows a reasonable answer.

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Why there is no differential in a train. What happens when a train takes a turn?

Kingshuk

• Feb 9th, 2015

Trains do not have differentials. but we all know they do take turn. this is achieved by CONING of wheel. since the centripetal force attracts the train to the centre of curvature, the outer wheels di...

Komal Ashu

• Nov 7th, 2012

To facilitate turning of the trains, a number of factors are taken into consideration. The trains never turn at a very sharp angle. The change in direction of the trains is facilitated by a gradually ...

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Why the water collected below mud pot is cooler than that is in the pot?

veeresha

 Profile Answers by veeresha Questions by veeresha

• Sep 24th, 2013

Lets Assume, The Mud/ Sand Below the Pot is wet. The water particles on the surface of the mud (which is in contact with Air) gets evaporated. to get evaporated that layer of water needs Latent heat t...

Sagar Gupta

• Aug 27th, 2012

It is due heating effect of evaporation.

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santosh das

• Oct 31st, 2016

Displacement pump is a mechanical pump which is converted to mechanical energy to hydraulic energy.

Centrifugal pump is a mechanical device which is converted to mechanical energy to kinetic energy or pressure energy.

sahil sarpaul

• Jun 20th, 2016

In displacement pumps the fluid is confined in the space i.e. within the working boundary of the pump whereas in case of the centrifugal pumps the is not confined within the boundary instead its supplied uniformly and steadily to get the required motion.

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What happens when water flowing through pipe is suddenly cut?

kiranaimhigh

 Profile Answers by kiranaimhigh Questions by kiranaimhigh

• Jun 30th, 2011

If a pipe is of 1000 Mts in length and water is flowing through it..when the pipe is not cut..water will flow through out the 1000 Mts.. but when is it cut at around 500 Mts, the resistance offered to...

mohsinali

 Profile Answers by mohsinali Questions by mohsinali

• Feb 14th, 2010

When water flows from pipe it does have constrained motion & when supply is being cut suddenly, water particle tends to continue its motion but it doesn't so. Therefore the pressure wave is been g...

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Eng Omar

• Dec 8th, 2013

You can use ammonia vapor to cool water or air...it is used as desert refrigerator

shashank

• Jul 11th, 2012

U can get to the reference to patent application number 1015/del/2011

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In relation to Solid Modeling Concepts, Explain what do you mean by Reverse Engineering

amar

• Apr 12th, 2014

Reverse engineering is the process of making a cad model of the physical component...this model is then modified or added with new features for improvements..

iamthebest_askme

 Profile Answers by iamthebest_askme Questions by iamthebest_askme

• Feb 19th, 2009

It is a process in which a already engineered product is redesigned from its actual form that is by measuring the actual physical model and created again, mainly b,cos off--1> straight forward copying...

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