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Efficiencies of Turbines
What are the Efficiency of Gas, Steam, Hydro Turbines?
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7QC tools
Explain What are the 7QC tools?
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Common Heat Exchanger
Which type of heat exchangers are commonly used:
a. Counter current flow
b. Parrell current flow
c. Cross flow
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What is SMAW ?
SMAW means Sheilded Metal arc welding.
vrsaikumar
- Nov 4th, 2008
There are 2 types of metal arc welding... shielded metal arc welding and unshielded... OR we can also say as protected and unprotected, metal arc welding...SMAW is the the welding process which shie...
harikumar
- Mar 6th, 2007
hiSMAW: Shileded Metal Arc weldingIn smaw , the welding will be done by using electrodes. The selection of electrodes will be based on Parent metal that we are going to weld and strength of the weld m...
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What is the meaning of refrigerant R21?
vrsaikumar
- Nov 4th, 2008
Dichlorofluoromethane or Freon 21 or R 21 is a halomethane or hydrochlorofluorocarbon. It is a colorless and odorless gas. Its critical point is at 178.5 ?C (451.7 K) and 517 MPa (51.7 bar). At tempe...
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Pully Size
How to found pully size? how many type off pully? why we used pully?
subrat
- Oct 9th, 2014
Pulley is used for torque transmission from one shaft to another shaft .. If the shafts are parallel to each other. We use pulley for easy to transfer torque through the belt or chain.. Thank you
vrsaikumar
- Nov 4th, 2008
Uses: Pulleys are one of the types of transmission devices which are used for transmitting power from 1 shaft to another shaft with the help of belts of ropes. Types of pulleys: 1. Cast iron pulleys2...
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Boiler Feed Pumps
Why are the stages being provided in Boiler Feed Pump?
kit_inton
- Jun 19th, 2011
Boiler feed pump stages deliver high discharge pressure from pump to overcome the pressure inside the boiler drum and pressure losses from pipe connections, and also friction loss.
sudeeb
- Dec 20th, 2010
Boiler feed pump is a multi-stage centrifugal pump where no of impellers more than one usually >3 . Depending upon the boiler working pressure pump will select. The pump should have high positive suction to avoid cavitation, usually take more than 10m. feed water temperature will be more than>65'C.
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Hai i want to know the function of advanced engines which is used for aviation.
monolith
- Apr 22nd, 2007
A common SHAFT that run throught the whole engine is pretty much the essense of jet engine. this SHAFT connect a COMPRESSOR (basically a complicated cascade of fan like blade with runner and stator ) ...
asif hussain
- Apr 17th, 2007
The Recently used engines in the aviation industry are predominantly jet engines and turbo engines similar to gas turbines. For Details look Up 'Turbines used in Aeroplanes' and 'Jet Engines'
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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...
Mechanical Engineering Interview Questions
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