-
Engine Power
What does unit PS for the engine power means?
theleo
- Sep 4th, 2009
PS stands for Pferdest?rken, a German measure for the power output of a car, equivalent to 1?01387 bhp.
-
Cooling Tower
How can we decide the height for cooling tower?
bhargavmech
- Oct 1st, 2009
General rules are usually used to determine cooling tower height depending on the necessary time of contact:Approach to Wet Bulb (0F) Cooling Range (0F) Tower Height (ft) ...
-
Potential Voltage
Van de graff generator produces a voltage of 100,000 V but it does not harm us, where as, a 220V in wall outlet leads to death, Why?
chris10156
- Feb 17th, 2010
Voltage is not what kills someone, it is the amps.? 4-5 amps is usually all it takes for the heart to stop and to kill someone.? 100,000 volts would really sting, but it has an amperage so little that it does not harm anything.
-
Alternate Propulsion Technologies
What are the propulsion technologies used in automobiles other than I.C. engines?
-
Involute / Cycloidel gear
Is involute or cycloidel gear best and generally used in industry? Give Reason.
S.KALAIYARASAN
- Sep 13th, 2009
Involute gear is best when compared to cycloidel gear. Because backlash is very less.
-
Vernier Calliper Material
What is the material of Vernier Calliper?
-
Stagnation Property
What is stagnation property? What are its assumptions?
vayyanum
- Jun 19th, 2009
STAGNATION PROPERTY refers to property of fluid at 0 velocity like the condition of temp, pressure etc. there arent any assumptions as such practical case front tip of an aeroplane.
-
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...
-
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.
-
Engine Test
How to find the max load of the engine?
-
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...
-
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...
-
Black Tyres
Why tyres are ever made black?
Read Best Answer
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...
-
DIN Standards
What are DIN Standards?
RAVI MENON
- Sep 16th, 2009
This is a German material standardDIN means DEUTSCHES INSTITUT FUR NORMUNG e.v
-
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.
-
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...
-
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...
-
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 ...
-
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.
-
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.
Mechanical Engineering Interview Questions
Read Best Answer
Ans