The Factors That effect the Detonation - Multiple Choice Questions and Answer

The Factors That effect the Detonation - Multiple Choice Questions and Answer Points : the factors that effect the detonation, mcqs, evaluation, objective type question and answer, multiple choice questions and answer 1. Detonation and pre-ignition are the same conditions of abnormal combustion
a) Yes
b) No

2. Octane rating of a given grade of gasoline is a measure of its
a) Detonation resistance
b) Pie-ignition resistance

Identification of Causes of Detonation Higher Octane Fuel

Identification of Causes of Detonation Higher Octane Fuel Points : identification of causes of detonation higher octane fuel, loss of exhaust gas recirculation, compression ratio, The octane rating of a given grade of gasoline is a measure of its detonation resistance. The higher the octane number, the better able the fuel is to resist detonation. Most engines with high compression ratios (over 9:1), turbochargers, superchargers, or with accumulated carbon deposits in the combustion chamber may require 89 or higher-octane fuel.

Effect of Carbon Deposits Operating Conditions Spark Advance Effect on Detonation

Effect of Carbon Deposits Operating Conditions Spark Advance Effect on Detonation Points : effect of carbon deposits operating conditions spark advance effect on detonation, the factors that effect the detonation, problems in internal combustion engines, ic, engine, auto diesel An accumulation of carbon deposits in the combustion chamber and on the top of the pistons can increase compression to the point where detonation becomes a problem. Carbon deposits are a common cause of detonation in high-mileage engines, and can be especially thick if the engine consumes oil because of worn valve guides and seals, worn or broken piston rings and/or cylinder wear. Infrequent driving and not changing the oil often enough can also accelerate the buildup of deposits. In addition to increasing compression, carbon deposits also have an insulating effect that slows the normal transfer of heat away from the combustion chamber into the head.

Effect of Compression Ratio

Effect of Compression Ratio Points : effect of compression ratio, the factors that effect the spark knock, the factors that effect the detonation, problems in internal combustion engines, ic, engine, auto diesel Increase in either of inlet pressure and compression ratio invariable increases the detonation tendency. The choice of compression ratio to be used is influenced not only by consideration of power and fuel economy and the detonation characteristics of the fuel.

Non Detonation Type Combustion Chambers

Non Detonation Type Combustion Chambers Points : non detonation type combustion chambers, the factors that effect the spark knock, the factors that effect the detonation, problems in internal combustion engines, ic, engine, auto diesel Marked improvements have been made in actual shapes of combustion chambers of modem engines and in the placement of the valves and sparking plugs to give the best conditions for:
Short flame travel path;
Good volumetric efficiencies;
Satisfactory scavenging of the exhaust gases;
Adequate cooling of sparking plug points:
Good cooing of exhaust value head
The use of the highest possible compression ratio for any fuel of given octane rating.

Effect of Types of Combustion Chamber and Detonation

Effect of Types of Combustion Chamber and Detonation Points : effect of types of combustion chamber and detonation, the factors that effect the spark knock, the factors that effect the detonation, problems in internal combustion engines, ic, engine, auto diesel The shape of the combustion chamber has an important bearing upon the out put and thermal efficiency of the engine.

The shape depends upon the location of the valves. If the valves are in the cylinder head, it is possible to approximate to the ideal spherical shape.

Effect of Squish and Quench in Detonation

Effect of Squish and Quench in Detonation Points : effect of squish and quench in detonation, the factors that effect the spark knock, the factors that effect the detonation, problems in internal combustion engines, ic, engine, auto diesel The shape of the combustion chamber, including those portions of the piston and valves, which acts as chamber wall surfaces, is most important from the point of view of detonation. The piston shown in the following diagram is called a squish piston because the charge is squeezed radically inward near top dead center.

With the same inlet valve the combustion time is about the same as with the flattop piston, since the spark advance required is about the same, but the tendency to detonate is appreciably less.

The Factors That effect the Spark Knock

The Factors That effect the Spark Knock Points : the factors that effect the spark knock, the factors that effect the detonation, problems in internal combustion engines, ic, engine, auto diesel Detonation (also called “spark knock”) is an erratic form of combustion that can cause head gasket failure as well as other engine damage. Detonation occurs when excessive heat and pressure in the combustion chamber cause the air/fuel mixture to auto-ignite. This produces multiple flame fronts within the combustion chamber instead of a single flame travel.