Q. What is IC ENGINE?
Ans.: The internal combustion engine converts chemical energy into useful mechanical energy by burning fuel. Chemical energy is released when the fuel-air mixture is ignited by the spark in the combustion chamber. The gas produced in this reaction rapidly expands forcing the piston down the cylinder on the power stroke.
Q: What are the Advantages and Disadvantages of using LPG in Car?
Ans.:
Advantages
1. Complete combustion
2. Fuel saving
3. Homogenous combustion.
Disadvantages
1. As complete combustion is occurring, more heat liberated, not advised for long journey, engine will be over heated
2. Installation is difficult
3. Reduce engine life efficiency.
Q: What is Scavenging?
Ans.: Scavenging is process of flushing out burnt gases from engine cylinder by introducing fresh air in the cylinder before exhaust stroke ends.
Q: What is meant by supercharging?
Ans.: Supercharging is a method of increasing an engine’s power output, by forcing air into the engine under greater than atmospheric pressures. Supercharging usually refers to belt driven compressor (I.E. roots/screw or centrifugal), some early uses superchargers were driven directly off the crank shaft.
Q: Why diesel Engine don't have spark plug?
Ans.: The compression ratio is high enough to combust the diesel without the aid of sparkplugs Answer Most diesel engines will have a 'glow' plug, this gives of enough heat to help get the engine started, the heat generated from the first few revolutions together with the compression from the piston is enough to ensure the engine keeps running. Some modern diesel engines no longer require a glow plug.
Q: Which are the reference fuels for knock rating of S.I. engines?
Ans.: n-heptane and ISO-octane.
Q: Which pollutant is major greenhouse gas and what is its effect?
Ans.: CO is major greenhouse gas and it traps the radiation of heat from the sun within earth's atmosphere.
Q: What are the important operational performance parameters in design of fuel firing equipment?
Ans.: Fuel flexibility, electrical load following capability, reliability, availability, and maintenance ease.
Q: How the analyses and calorific values of fuels can be reported?
Ans.:
It may be reported as
1. As received or fired (wet) basis .
2. Dry or moisture free basis.
3. Combustible or ash and moisture free basis.
Q: What is ATFT Technology used in Honda Hunk?
Ans.: ATFT means Advance Tumble Flow Induction Technology,
Tumble flow means swirling. In this technology fuel air mixture from the carburetor into the engine cylinder with a swirl action. The advantage being one gets a more efficient burning of fuel hence more power and better fuel economy with lesser emissions.
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