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Cooling of water
Why the water collected below mud pot is cooler than that is in the pot?
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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Stiffness
If two springs of stiffness K1 & K2 are in series, the equivalent stiffness is.......................
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Propeller Shaft
Which material is used for propeller shaft ?why?
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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Capillary tube in Refrigerator & A.C.
How to calculate the length of capillary tube used in Refrigeration & A.C.?
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Carnot Engine Efficiency
What is maximum efficiency of Carnot Engine?
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bhargavmech- Member Since Jul-2009 | Aug 1st, 2009
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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SI and CI Engine
Why we use Petrol in SI Engine & Diesel in CI Engine
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hosam_ozo- Member Since Apr-2010 | Aug 8th, 2010
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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SI/CI Engine Start Technology
Why we do not use same technology to start both SI/CI engine?
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Types of power transmission Elements
Name the types of power transmission elements with respect to drive ?
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dibugwu ifeanyi- Member Since Nov-2008 | Nov 19th, 2008
Gear drive, Belt drive and Chain drive.
nikhil
- Nov 7th, 2015
Gear drive
Chain drive
Belt drive
Shaft drivepraveen
- Oct 17th, 2015
Power transmission
By V Belt
By Chain
By Gear
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If the HR asks me "Being mechanical engineer why you want to the IT industry. Please give me answers as i am going to attend campus interview in few days.
pranee.raj
- Dec 22nd, 2009
The knowledge of an IT guy is used only by an educated one but the knowledge of a Mechanical engineer is used even by an uneducated [For Example: Farmers], this itself proves the scope of mechanical, ...
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Meaning of Numerology on spanners and wrenches
When I see any spanner then always there is a number on its ends, like 10,11,12...
What is the exact meaning of that numbers?
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Cylinder Shape
Why gas container are mostly in a cylindrical shape?
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Suppose there is a weighing balance.In one hand of weighing balance there is weight of 1 KG which is perfectly balancing flask full of water which is on the other hand. Now if i immerse finger in water, will the equillibrium be disturbed?
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Stercus- Member Since Dec-2007 | Aug 18th, 2009
Akash, your FBD won’t work if you leave off external contacts – they need to be converted to force arrows. The buoyed object provides one such force: the buoyant reaction force.
You seem to agree that there is a force acting upwards on the test tube, appearing on the spring balance acting against the weight. As the test tube and the bowl of water are stationary, not accelerating, there must be an equivalent reaction force acting downwards on the body of water, imparted by the object. To go into more detail, the surface of the object experiences a pressure distribution from the water, gradated downwards due to increasing pressure within the water body. The net result from the pressure distribution is that the water pushes up on the object (buoyant force). To avoid being crushed, the object pushes back against this pressure in all directions – so again you get net a reaction force in the opposite direction, downwards.
So the FBD of the water body needs a reaction force to account for buoyancy. This reaction force acts downwards, from the centre of the displaced volume and is equal to the weight of the water displaced. The weight of the object immersed doesn’t need to be considered as this is supported but the weight of the displaced volume of water does.PRASHANT
- Oct 16th, 2011
It will not change the reading..... Lets take a simple case... A water flask is putted on a weight balance and a rod is immersed in it which is tied to ceiling with help of a rope. The tension in the...
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Torsion- Shafts
Why do we use solid shafts for transfer of power in case of pumps/ turbines & other machines why we use a hollow shaft (pipe) in universal joints of automobiles; although the rated load and twist is approx. the same.
Arun Govind Neelan
- Feb 27th, 2012
In automobile application we have to consider weight in addition to torque and strength. Hollow shaft has high torque transmitting capacity per unit mass compared to solid shaft. If you consider bending stress diagram for hollow it is min at centre so material requirement is minimum at centre.
ravindra sariya
- Feb 16th, 2012
In case of turbine and pump there is an axial component of force present so solid shaft can deal better than hollow shaft...and in automobile only pure torsion is present and also hollow shaft have le...
Mechanical Engineering Interview Questions
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