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Air Scooper
What are the uses of air scooper?
senthil222
- Nov 25th, 2009
Its main function is to allow a direct flow of air to the engine, hence the need for it to be upraised so as to effectively channel air to the engine compartment. It may be closed, and thus purely decorative, or serve to enhance performance in several possible ways.
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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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Calorific Value
What is Petrol Calorific Value?
arun govind neelan
- Dec 24th, 2009
It is defined as amount of heat energy produced when unit mass of fuel is burned1cal=4.184 joule
S.KALAIYARASAN
- Apr 21st, 2009
The calorific value of the petrol is 48,000kJ/kg.The highest calorific value fuel is hydrogen is 141,790 kJ/kg.
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Vanadium in HSS
What is the use of Vanadium in High Speed Steels?
mailmisterk
- Dec 26th, 2009
Vanadium in hss forms very hard carbides and thus increases the hardness and increases the wear resistance
Manjiri ayade
- Oct 13th, 2009
Vanadium is corrosion resistant. HSS is basically used to manufacture cutting tool or machining tool which operate at faster rate. So this property of Vanadium is essential here.
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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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Engine Coolant
Can we use the same coolant for cooling I.C. engine as well as for machining purposes? Why or why not?
vijay m
- Dec 30th, 2009
The most considerable property of coolant in viscosity which should be greater when used in Engine walls & should be lesser when used during machining operations.
shukla_vivek1011
- Sep 16th, 2009
The coolant required to use in I.C engines must posses somewhat greater viscosity as compared to the coolant used for any machine because, coolant of any machine got cooled after some periodic interval as compared to in case of any I.C engine coolant.
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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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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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Car Parked in Sloped Area
Why vehicle does not move when its gear is applied though parked in slope area?
shefeerps
- Jan 22nd, 2010
In Geared Position the vehichle is connected to the piston. The gravity force on car parked in a slope is not enough to move the piston systems in the multi cylinder engines to expand or compress inside the cylinder.
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Gear Ratio
How gear ratio helps in power variation?
Nagesh M
- Jan 23rd, 2010
T1/T2=N2/N1, where T1 is no of teeth on driver; T2 is no of teeth on driven; N2 is speed of the driven gear & N1 is speed of the driver gear. The speed is inversly proportional to the torque developed by change of gears.
shefeerps
- Jan 22nd, 2010
N1/N2 = V1/V2where, N1=no. of teeth in 1st gearN2=no. of teeth in 2nd gearV1=velocity of 1st gearV2=velocity of 2nd gearVelocity varies with change in diameter of a rotating body system. Hence power.
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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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Bending Moment
What is the shape of bending moment diagram if a lone moment act at the mid point of the simply supported beam?
d_tyro_22
- Jan 27th, 2010
Expression for bending moment in terms of distance 'x' measured from left end:= -(Mx/L) ; 0<=x<L/2=-(Mx/L) + M ; L/2...
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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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IC Engine Fuel
Explain the technical difference between LPG and Petrol in an IC engine?
mohsinali
- Feb 14th, 2010
System that handles Petrol & LPG is same but only basic difference is about fuel ratio.LPG doesn't require much effort in carburator to mix up the air because it require less air and that is because L...
ajay s joshilkar
- Dec 19th, 2009
LPG is already compressed petrol, therefore it doesn't Produce heat energy as the common petrol produce.
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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.
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Turbine Efficiency
Will Bleeding of steam increases or decreases the efficiency of Turbine? Explain.
daruljothi
- Mar 12th, 2010
Bleed steam will increses the cycle efficiency of the unit because:1. It was takenout after considerable work output by HP turbine and 2. It can be used fully for heating of feed water and etc., incre...
technowiz
- Nov 1st, 2009
Bleed steam will increase the turbine efficiency this process is basicaly known as regeneration.
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Strenth of Material
A cantilever beam is loaded a point on its ends what will be the effect in shear force?
debesh220
- Mar 19th, 2010
Due to the shear force the bar shows a hogging type bending moment. The shear force diagram is like a triangle triangle in +ve direction.
d_tyro_22
- Jan 27th, 2010
Considering that the load is a concentrated vertical point-load, acting on the free end of the cantilever, reaction at the rigid end can be calculated, shear-force diagram and bending moment diagrams ...
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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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Mechanical Engineering Interview Questions
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