What is the difference between lathe & milling machine? What are the operations that we cannot perform in lathe but milling?

ravi patel

• Aug 8th, 2014

In Lathe, the job will be rotating, tool is stationery. While in milling machine job is stationery and the tool is rotating.

ADIRAJ C K

• Jul 12th, 2014

IN LATHE, THE JOB WILL BE ROTATING TOOL IS STATIONARY. WHILE IN MILLING M/C JOB IS STATIONERY AND TOOL IS ROTATING.

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How do you calculate the heat transfer thorough a cylinder with lower temperature on the bottom than on the top. the temperature of the ambient is 20 deg C, inside is 77 deg K, the bottom disk is 5 deg C. what would be the temp on the top?

Akshay Kulkarni

• Aug 4th, 2014

No formula at all.

Hint : Considering the effect of pressure difference with density, for a cylinder, it is not possible to have low temp. at the bottom part than at the topmost part.

So, the question asked here to check the basic knowledge about the fluid properties.

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What happen if we pour petrol in diesel engine and vice versa? Explain

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richa tiwari  

 Profile Answers by richa tiwari Questions by richa tiwari

• Member Since Aug-2009 | Aug 30th, 2009

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When petrol is used in diesel engine, the engine will not work as gasoline (petrol) has high ignition temperature and therefore has to be ignited by spark-ignition. Diesel engine on the other hand works on the principal of self-ignition in compressed fuel?which?is not possible with petrol.

When diesel is used in petrol engine, there will be sudden combustion in the fuel due to spark ignition? bcoz diesel has low ignition temperature. This will lead to high knocking, which is absolutely undesirable.

kamlesh431

 Profile Answers by kamlesh431 Questions by kamlesh431

• Jul 24th, 2014

The compression ratio of petrol engine is 10:1 to 14:1 and for diesel engine is 16:1 to 22:1. If petrol is poured in diesel engine a blast may happen at this high compression ratio. So we cant use pe...

richa tiwari

 Profile Answers by richa tiwari Questions by richa tiwari

• Aug 30th, 2009

When petrol is used in diesel engine, the engine will not work as gasoline (petrol) has high ignition temperature and therefore has to be ignited by spark-ignition. Diesel engine on the other hand wo...

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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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What is diffrence between Impeller and Propeller?

Vivek K

• Jun 17th, 2014

Impeller has blades in which the blade angle can be varied.
propeller has fixed blade angles.

• Dec 8th, 2013

An impeller is used to suck air into something, such as a turbocharger or a vacuum cleaner.

A propeller is used for propulsion, such as on an airplane or a boat.

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gaurav dhote

• Jun 6th, 2014

The twisting or turning force required to turn or twist the object is know as torque.

balakumara samy

• Jun 14th, 2012

Torque is the measure of how much acting on the object causes the object to rotate

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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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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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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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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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Eng Omar

• Dec 8th, 2013

To transfer energy from the engine to the gearbox

Jay

• Sep 8th, 2012

As integral part of clutch it is connected with flywheel when the wheel is to be rotated. It is connected by the force which is exerted by pressure plate. It rotates because of high friction between c...

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What is meant by knocking? Why does it occurs?

himanshu shekhar

• Nov 10th, 2013

knocking is natural phenomenon which occurs in ic engine. no scientist in the world is capable to clearly explain this phenomenon but the explain much part of them.... how it occurs... in petrol eng...

Bhushan Kulkarni

 Profile Answers by Bhushan Kulkarni Questions by Bhushan Kulkarni

• Aug 11th, 2011

"knocking" or "pinking" is the phenomenon in which pressure wave of high altitude generated strikes wall of combustion chamber.pre. waves are generated because fuel attain self ignition temp. before flame front created by spark plug reaches to it.
THE MAIN FACTOR RESPONSIBLE IS PRE-IGNITION.

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Of which materials gears are made of?

jaskaran singh

• Oct 24th, 2013

Britial material

venkat

• Sep 26th, 2013

The majority of gears are composed of carbon and low-alloy steels, including carburised steels. The intended gear use will dictate the material used in its creation. For example gears to be used in fo...

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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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How to select the gear & pinion material and which material effective selection

vikki

• Sep 18th, 2013

Numerous nonferrous alloys, cast irons, powder-metallurgy and plastics are used in the manufacture of gears. However, steels are most commonly used because of their high strength-to-weight ratio and l...

saeed

• Jun 10th, 2013

We select a gear which is perfect for purpose the material which can resist to wear and tear.

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Calculate the length of capillary tube to be used for 165 litre refrigerator?

sukhvinder Singh bhogal

• Sep 8th, 2013

11 ft 31 bore

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deepika

• Aug 19th, 2013

Truss is a structure two or more triangles are connected with strait lines ends are connected by the nodes.so no.of degrees of freedom is zero

Tint San Lin

• Aug 18th, 2013

A truss element is defined by two nodes and each node has 3 degrees of freedom which are the displacements in 3 orthogonal directions.

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When designing a HVAC system how is total CFM distribution matched against fan CFM distribution?

ravisastry

• May 10th, 2013

Heating ventilation and air conditioning

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Mohan raj

• May 5th, 2013

If the suction,compression, power and exhaust are completed in two strokes of the piston, i.e one revolution of crank shaft, it is called as two stroke and if the four processes completed in four strokes of the piston, i.e two rev of crank shaft,it is called as four stroke engine.

Manpreet Singh

• May 10th, 2012

In two stroke SI & CI engine , there are two stroke of piston and one revolution of crankshaft to complete one cycle.....IN two stroke engine there are ports... But IN four stroke SI &CI engine , the...

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Explain about different types of Refrigeration and where they are used ?

hamada1989

• Mar 11th, 2013

There are 5 types:_
1-vapor compression
2-vapor absorption
3-Thermo electric refrigeration
4-Thermo acoustic refrigeration
5-cryogenic refrigeration

arpit saxena

• Oct 9th, 2012

There are 8 types of refrigation
1-ice refrigation
2-dry ice refrigation
3-evprotive type refrigation
4-air expanshion
5-cooling by theroutling
6-vapur absobsn system
7-vapur compeision system
8-thermo electric refrigation

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