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Explain about powder technology?
anoop03
- Jul 26th, 2007
The best example of powder metallaurgy is the cutting tools like insert you use for material removal.In this tungsten powders are compacted to the required shape and are then baked(sintered) at a tempertaure below its melting point to bind it.
Arun NArayanan
- Jul 16th, 2007
Powder technology involves the production of metal powders;compacting these powders to required shape by application of pressure and heat.Cu-Pb(cu and Pb dont mix in molten state) Bearings,tungsten(a refractory material) filaments,etc are prepared by powder mettalurgy.
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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 In fuel injection, the conventional carburettor has been replaced by injector which injects fuel in to the engine in a spray form based on the instructions of the Engine Control Unit (ECU) which is a part of the Engine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 In fuel injection, the conventional carburettor has been replaced by injector which injects ...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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What are types of principal stresses?
mailmisterk
- Dec 11th, 2008
A plane in which no shear stress acts is said to be principal plane. The only stresses acts on that plane are principal stresses. Normally, there are two types of principal stresses, maximum and minimum principal stresses.
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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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Stroboscope
stroboscope is used for measuring1. rpm of the spur gear2. temperature calibration3. velocity of the reciprocating engine4. all the above5. None of the above
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santoshmit- Member Since Dec-2007 | Dec 26th, 2007
used to measure rpm,more importantly to monitor the condition of a high speed rotatating m/c
Sudharshan Ganesh
- Jul 9th, 2011
It is a device that has a flickering light..the light flickering intervals are know and a mark is made on the shaft whose rpm is to be measured..as the mark interrupts the light and based on the calculations the rpm is determined.
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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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Octane Number and Cetane Number
What is the octane number of gasoline and cetane number of diesel used in India?
pradeep
- Sep 11th, 2011
Cetane No. Diesel - 45 to 55
Octane No. Petrol - 80 to 85bijuvh
- Oct 25th, 2009
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)...
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Hybrid Vehicle
What is hybrid vehicle? Where it is being used? How is it beneficial over the Ordinary Vehicle?
Kuldeep Janbandhu
- Oct 9th, 2015
A hybrid vehicle is a vehicle that uses two or more distinct power sources to move the vehicle for example a conventional internal combustion engine and also a high voltage electric motor.
NSK7777
- Aug 20th, 2009
A hybrid vehicle is a vehicle mostly that uses both electric motor and the engine as a power source. During idling---it uses only the engine power .During acceleration---it uses both engine and motor ...
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Petrol Engine
What happen if we pour petrol in diesel engine and vice versa? Explain
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richa tiwari- Member Since Aug-2009 | Aug 30th, 2009
When petrol is used in diesel engine, the engine will not work as gasoline (petrol) has high ignition temperature and therefore has to be ignited by spark-ignition. Diesel engine on the other hand works on the principal of self-ignition in compressed fuel?which?is not possible with petrol.
When diesel is used in petrol engine, there will be sudden combustion in the fuel due to spark ignition? bcoz diesel has low ignition temperature. This will lead to high knocking, which is absolutely undesirable.kamlesh431
- Jul 24th, 2014
The compression ratio of petrol engine is 10:1 to 14:1 and for diesel engine is 16:1 to 22:1. If petrol is poured in diesel engine a blast may happen at this high compression ratio. So we cant use pe...
richa tiwari
- Aug 30th, 2009
When petrol is used in diesel engine, the engine will not work as gasoline (petrol) has high ignition temperature and therefore has to be ignited by spark-ignition. Diesel engine on the other hand wo...
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Energy Required to Break a Material
What is the energy required to break the material is called as?
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Lathe
How a lathe can be specified?
Gambit
- Sep 11th, 2009
Lathe can be specified in no. of ways:* Swing over bed (max. dia. of workpiece over the bed)* Swing over carriage* Distance between the headstock and tailstock* Bed height and Bed width* Shipping weight of lathe* Max. spindle speed etc.
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Boiler Efficiency
How can we increase the efficiency of boiler?
deemech
- Jul 11th, 2010
Boiler efficency can be increased by incresing the boiler pressure or by the reheating the steam or by the process of regeneration. Another method is that by increasing the mean temperature of heat addition so that boiler efficiency can be inceased.
shammi
- Jun 8th, 2010
The main problem which derease the efficiency of boiler are caused by hard water. So the best method to increase the efficiency is to use hardness free water and for that water should be treated properly.
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Gravitational Constant
The value of gravitational constant below see level at 4500m depth was found to be 9.8295m/s2 and this is maximum after that it decreases...What would be the value of the acceleration due to gravitation at the center of earth?
saurav_sammy
- Jun 20th, 2010
the gravitation constant again decreases as we go down the 4500m level below the sea level....
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Gear Train
Explain How gear train works?
PRAVINMUTHURAJ
- Jun 19th, 2018
In a number of gears train are fixed transmit torque or power in one shaft to another shaft. And the gear train is engaged and disengaged in parallel linear motion
rakesh8014
- Jul 5th, 2010
It consist of set of gears assembled together to provide a large range of speed variation to output shaft with limited range of engine speed.it will also provide required torque for different stages of operation.
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2 Wheeler Reverse Gear
Four wheelers are provided reverse gear whereas two wheeler are not provided, Why?
Pradeep Manickam
- Mar 27th, 2011
Its because two wheeler can be easily moved by a force whereas car can not be easily moved by our force.hence a reverse gear is required
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Ss 316 specification of hardness
how many 5 m dia hardness in bhn of 316 material we are facing the problem in machining & tolling not work properly
Mechanical Engineering Interview Questions
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