Octane number and cetane number
What is the octane number of gasoline and cetane number of diesel used in india?
How can we decide the height for cooling tower?
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) ...
Pump and air compressor bearings
Name the different types of bearing?What type of bearing used in pumps?What type of bearing used in air compressor?
There are many types of bearings, each used for different purposes either singularly or in combinations. These include ball bearings, roller bearings, ball thrust bearings, roller thrust bearings ...
What is the difference between tractive force and frictional force? Which one drives the vehicle? What are the directions of the forces with respect to the wheel?
Yes you are right. But as you know that traction force is applied by the car wheels (tyres) against the ground. As the wheel is moving forward, the traction force is in the forward direction an...
Thanks for your reply, but I have a small doubt.Now consider a drive wheel rotating in a dry surface and other one on a icy surface.Slip do not occur in the first one because traction force is les...
Energy required to break a material
What is the energy required to break the material is called as?
Energy reqd to break a material is known as impact strength (or impact energy)
Why do objects rotating with more speed appearing to be stationary and sometimes appearing as rotating in the opposite direction?
The wagon-wheel effect (alternatively, or stagecoach-wheel effect, stroboscopic effect) is an optical illusion in which a spoked wheel appears to rotate differently from its true rotation. The wheel c...
It is due to illusion effect.
Why tyres are ever made black?
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Member Since Jul-2009 | Answered On : Aug 5th, 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
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...
What is maximum efficiency of carnot engine?
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Answered by: bhargavmech
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Member Since Jul-2009 | Answered On : 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.
Carnot engine efficinency is not 100 percent or unity because there will be a heat rejection in the cold reservoir however it works on the reversible cycle but Carnot engine have not worked with 100 percent efficiency. However the second law efficiency may be 100 percent or unity.
Since it is engine based on ideal cycle that is carnot cycle, which is considered as the ideal cycle to which other cycle are compared, hence its theoritical efficiency is 100 percent.
What motor do they use in railway engines for traction?
In Local memu train, series motor is used bec it requires high torque initially e.g. Anand Memu, Vadodara memu
In Express train, I.M motor or Shunt motor is used bec. it requires high torque as well as constant speed e.g Ashram Express
Traction motors used to drive trains are series motors that provide the required torque and horsepower to get massive amounts of weight moving
What is the practical difference speed and torque?
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...
oops i was wrong... speed is inversely proportional to torque..
Which is more elastic - steel or rubber?
Elasticity is the property by virtue of which body regain its original shape and size after removal of external force.
Steel have a more elasticity then any other material
What does dtsfi mean? Which is used in automobile engine section?
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Member Since Jul-2009 | Answered On : Jul 30th, 2009
DTS-Fi stands for "Digital Twin Spark Fuel Injection", a ‘Bajaj Patented Technology’. In fuel injection, the conventional carburettor has been replaced by injector which injects fuel in to the engine in a spray form based on the instructions of the Engine Control Unit (ECU) which is a part of the Engine Management System EMS. The Electronic Control Unit (ECU) is microprocessor based and is the brain of the fuel injection system. It processes information sent by various sensors and instantly determines optimum fuelling and spark timing for various engine-operating conditions. The ECU contains detailed information of the engine's characteristics from which it picks the necessary data for commanding both fuelling & spark timing.
The main advantages of Fuel Injection are: a. Increased power output for same cc. b. Better low-end torque. c. Lower fuel delivery & optimisation of spark timing. d. Improved cold start, quick warm-up and excellent response to sudden acceleration. e. Lower emission levels. f. Self-detection and communication of fuel system malfunctioning if any.
DTS-Fi stands for "Digital Twin Spark Fuel Injection", a ‘Bajaj Patented Technology’. In fuel injection, the conventional carburettor has been replaced by injector which injects ...
DTSFI means Digital Twin Spark Fuel Injection. The engine using this technology will use 2 spark plugs which will ensure better combustion of fuel and hence better fuel economy and less pollution.
Did anyone got the halticket of vizagsteel plant . Let me when is th eexam.Urgent reply wanted
hey i got the halticket for the vizag steel re-test.. halticket is nw given for only for those candidates who already had written the earlier exam...
Now the exam is on 6th of sept (3PM-5PM)
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Cetane No. Diesel - 45 to 55
Octane No. Petrol - 80 to 85
The higher the octane rating, the slower the fuel burns. High-performance engines typically have higher compression ratios (and hence longer piston strokes) which requires higher octane (slow burning)...