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Reversible / Cyclic Process
What is the difference between reversible process and cyclic process in thermodynamics?
Gambit
- Jul 19th, 2009
Reversible process is one in which the system and surroundings can be restored to their initial states by reversing the process.eg. in thermodynamics, A(P1,T1) <---> B(P2,T2) is a reversible pro...
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Strength of Oval Pipes
Why is the strength of oval pipes more than that with circular cross-section?
sunnyzafar
- Jul 4th, 2010
It is bcoz the value of section modulus of an ellipse is more than than of a circle. Hence using bending eqn, we can see that strength of oval pipe is more than circular pipe.
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Engine Test
How to find the max load of the engine?
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Laws of Thermo Dynamics
State the laws of Thermo dynamics.
selvasuresh
- Nov 3rd, 2009
There are laws of thermodynamics1. Zeroth law2. First law of thermodynamics3. Second law of thermodynamics4. Third law of thermodynamicsZeroth laws says that energy can neither create nor be destroyed...
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Engine Gear Box
Gear box is for power transmission, then why cant we give a small gear box for big engine and vice versa?
kanthasami
- Aug 3rd, 2009
Gear boxes are not only meant for Power Transmission, but also get the different speeds and torques according to the requirement. For example, while starting a vehicle, we need less speed and more tor...
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Black Tyres
Why tyres are ever made black?
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Editorial / Best Answer
bhargavmech- Member Since Jul-2009 | Aug 6th, 2009
When Tyres are parked for extended periods, tires dry out, discolor and eventually crack and split. The major factor degrading tires and other synthetic and rubber products is ozone, an odorless gas which is part of the air we breath. When combined with ultraviolet light (the invisible part of sunlight) a reaction occurs that attacks the tire polymer. To protect against ozone and UV damage, a stabilizer molecule called a “competitive absorber” is blended with the tire polymer. Competitive absorbers work by capturing and absorbing UV radiation and converting it to heat which is dissipated harmlessly. All tire manufacturers use the same competitive absorber, carbon black. This is why all tires are black
bhargavmech
- Aug 6th, 2009
When Tyres are parked for extended periods, tires dry out, discolor and eventually crack and split. The major factor degrading tires and other synthetic and rubber products is ozone, an odorless gas w...
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DIN Standards
What are DIN Standards?
RAVI MENON
- Sep 16th, 2009
This is a German material standardDIN means DEUTSCHES INSTITUT FUR NORMUNG e.v
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Petrol and Diesel
Why are petrol and diesel are most popular among fuels used in I.C. engine?
shukla_vivek1011
- Sep 6th, 2009
Because the ignition point or the combustion point of these two fuels (fluid) are very high as compared to any other fuel, other than gas fuel.
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ATFT Technology
What is ATFT Technology used in Honda Hunk?
vibha_v
- Nov 28th, 2009
ATFT means Advance Tumble Flow Induction Technology, Tumble flow means swirling. In this technology fuel air mixture from the carburator into the engine cylinder with a swirl action. The advantage bei...
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Surging and Choking
What is Surging and Choking?
r.mech
- May 8th, 2010
Due to increse of load on the compressor, mass flow rate is decresed. It would again tend to increase the mass flow rate. This unsteady to and fro motion of the fluid will cause pulsation in the compr...
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Diesel and Petrol Engines
Why diesel engines are called as high torque engines and petrol engines as high speed engines?
Sanjana0320
- Nov 12th, 2009
As diesel engine has high compression ratio therefore it has high torque. Petrol engines have high speeds coz it produces more heat at combustion chamber because of high calorific value moreover heat ...
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Diesel Engine Efficiency
How to control air flow during suction stroke in Diesel engine, as excess Oxygen too reduces the efficiency of engine?
d_tyro_22
- Jan 27th, 2010
In my opinion, extent of opening or closing of the throttle valve is synchronised (during the designing of engine) according to the amount of air intake as per requirement.
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Ethanol Fuel Tank
Why ethanol fuel tank is not used in automobile for increasing efficiency?
rohanmeher0287
- Nov 13th, 2009
Because in automobile we use diesel fuel and diesel fuel and ethanol are non mixing in nature. Gasoline is a octane fuel whereas diesel is a cetane fuel.
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DTS I Type Engines
In DTS I type engines, What will be time delay for 2nd spark produced to the 1st?
ajay s joshilkar
- Dec 27th, 2009
Both the sparks are produced at a time, therefore time between two sparks is zero.
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0 Degree Centigrade
Water freezes at 0 degree centigrade, Ice melts at 0 degree centigrade. How can both be true?
ajay s joshilkar
- Jan 20th, 2010
It is due to latent heat. When heat is supplied to ice at 0 d cg, this latent heat is utilised to convert the phase of ice into water without increasing the temperture and vice versa.
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Absolute Zero
Why is a temperature of absolute zero unachievable?
uthipse
- Jan 26th, 2010
Absolute zero of temperature may be defined as that temperature at which the rms velocities of the gas molecules become zero which is applicable only for ideal gas. Because practically, under extreme low temperature, gases change their stage to liquid much above the abs. temp. and then to solid.
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Isotrphic, Isentrophic, Entrophy and Enthalphy
What is the meaning of isotrphic, isentrophic, entrophy and enthalphy?
kathi88
- Jan 14th, 2010
In general, isotropy means uniformity in all directions.For ex: we say all metals are isotropic in nature.Isentropic process is a constant entropy process.Entropy is the degree of randomness of a subs...
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Bearing Clearances
How can we measure the industrial bearing clearances?
deepakargowda
- Apr 30th, 2010
We can measure bearing clearance with an outside micrometer and a dial bore gauge. We can also use plastiguage to measure the clearance.
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Pawl Ratchet
How do pawl and ratchet works?
vinoythomas
- Mar 15th, 2010
A ratchet mechanism is based on a wheel that has teeth cut out of it and a pawl that follows as the wheel turns
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Labyrinth Sseal
List different types of Labyrinth Seals How to measure Labyrinth Seal Clearrence?What is the allowable clearence?
Lokesh M
- Dec 8th, 2011
Different Types of Labyrinth Seal are as follows: Axial Labyrinth Seal Radial Labyrinth Seal Low Cost Labyrinth Seal Bearing Shield Labyrinth Seal Nilos Ring (AV) Labyrinth Seal Nilos Ring (JV) Labyr...
Mechanical Engineering Interview Questions
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