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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.
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Frictional Force
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?
bhargavmech
- Aug 29th, 2009
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...
NSK7777
- Aug 25th, 2009
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...
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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?
bhargavmech
- Aug 29th, 2009
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 ...
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Did anyone got the halticket of vizagsteel plant . let me when is th eexam.urgent reply wanted
bhargavmech
- Aug 27th, 2009
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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What is the procedure of I.C. engine testing?
thoratpiyush
- Aug 26th, 2009
There is two procedure for engine testingOne for IC engine testing at EOL (End of Line) another for IC engine testing for Quality assurance.In 1st testing defects in the engine assembly can find out...
mailmisterk
- Dec 11th, 2008
Morse test is conducted?to test ic engines. In this test, multi cylinders is used, indicated horse power, brake horse power and frictional power can be obtained.
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Stress Concentration
What is Stress Concentration? Give numerical examples.
harsh.ankalkoti
- Aug 21st, 2009
It is the concentration of stress at a particular point or region such as holes, sharp edges, corners etc., This is due to the reduced cross section area.As we know stress= force / area........The ...
vrsaikumar
- Jun 25th, 2009
Stress concentration or the stress will be maximum at the joints such as T joints and L joints. This results in fracture of materials easily. This is the reason whenever a material is manufactured w...
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Hardest Material
Which is the hardest material in the earth?
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Battery Discharge
How can loose terminals of the battery in the automobile cause discharging?
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Rotating Objects
Why do objects rotating with more speed appearing to be stationary and sometimes appearing as rotating in the opposite direction?
bhargavmech
- Aug 11th, 2009
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...
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Black Tyres
Why tyres are ever made black?
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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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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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What does DTSFI mean? Which is used in automobile engine section?
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bhargavmech- Member Since Jul-2009 | Jul 31st, 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.
bhargavmech
- Jul 31st, 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 ...
Gambit
- Jul 18th, 2009
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.
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Disc Brake
Why do most of the vehicle have disc brake only in the front axle?
NSK7777
- Jul 26th, 2009
While applying brake, the momentum of the vehicle will be transferred to front portion so it is necessary to have more braking force on front axle, that is why disc brake is used in front axle.
Gambit
- Jul 19th, 2009
Most of the vehicles are front wheel drives which uses disc brake in the front axles. This is because the inertia of the vehicle towards the front is more. So, to control the speed it is necessary to ...
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Engine Test
How to find the max load of the engine?
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Pump Displacement
Explain What is positive and non-positive displacement?
vrsaikumar
- Jul 9th, 2009
Positive displacement pumps are those which prevents undesirable flow and pumps the fluid within the closed space. Ex: Reciprocating pumps, Rotary pumps. Its efficiency is more when compared to non-p...
sachinlshinde123
- Jul 3rd, 2009
Positive displacement pump are those which discharge specific amount & quantity is constant?non positive pumps are those which discharge random amount & quantity varies.
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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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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.
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Vernier Calliper Material
What is the material of Vernier Calliper?
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What are the procedures for restarting a CNC machine after immediate shutdown
shranik_2005
- Apr 30th, 2009
There are two answer for this1) Follow the steps Switch on the, MCB, stabiliser, main switch, emergency switch then first give reff to Z axis .To start the prg where it was stopped first call the prog...
Mechanical Engineering Interview Questions
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