Internal combustion engines Fill in the Blanks or Say Yes' or 'No' :1.may be defined as a relatively rapid chemical combination of hydrogen and carbon in thefuel with the oxygen in the air resulting in liberation of energy in the form of heat.2. The lower and upper limits of ignition of the mixture depend upon the temperature and mixtureratio.3. The time lag between first igniting of fuel and commencement of the main phase of combustionis called the period of4. The ignition laga chemical process.5. An increase in compression ratio decreases the maximum pressure and the work transfer.6. The higher the self ignition temperature of fuel,the ignition lag.7. Ignition lag is the smallest for the mixture ratio which gives the maximum temperature.8. Ignition lag isif the initial temperature and pressure are increased.9. Ignition lag is much affected by turbulence.10. Usually the spark should occur at about 15° before T.D.C.11. The correct instant for the introduction of spark is mainly determined by the12. In general rich mixtures burn faster.13. For maximum power and economy a slow burning fuel needs a higher spark advance than a fastburning fuel.14.is the ignition of the homogeneous mixture in the cylinder, before the timed ignition sparkoccurs, caused by the local overheating of the combustible mixture.15. Pre-ignition increases the tendency of detonation in the engines.16. A very sudden rise of pressure during combustion accompanied by metallic hammer like soundis called17.is the rotational flow of charge within the cylinder about its axis.

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Fill in the Blanks or Say 'Yes' or 'No': 1. may be defined as a relatively rapid chemical combination of hydrogen and carbon in the fuel with the oxygen in the air resulting in liberation of energy in the form of heat. 2. The lower and upper limits of ignition of the mixture depend upon the temperature and mixture ratio. 3. The time lag between first igniting of fuel and commencement of the main phase of combustion is called the period of

Fill in the Blanks or Say 'Yes' or 'No': 1. may be defined as a relatively rapid chemical combination of hydrogen and carbon in the fuel with the oxygen in the air resulting in liberation of energy in the form of heat. 2. The lower and upper limits of ignition of the mixture depend upon the temperature and mixture ratio. 3. The time lag between first igniting of fuel and commencement of the main phase of combustion is called the period of

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Internal combustion engines

Fill in the Blanks or Say Yes' or 'No' :
1.
may be defined as a relatively rapid chemical combination of hydrogen and carbon in the
fuel with the oxygen in the air resulting in liberation of energy in the form of heat.
2. The lower and upper limits of ignition of the mixture depend upon the temperature and mixture
ratio.
3. The time lag between first igniting of fuel and commencement of the main phase of combustion
is called the period of
4. The ignition lag
a chemical process.
5. An increase in compression ratio decreases the maximum pressure and the work transfer.
6. The higher the self ignition temperature of fuel,
the ignition lag.
7. Ignition lag is the smallest for the mixture ratio which gives the maximum temperature.
8. Ignition lag is
if the initial temperature and pressure are increased.
9. Ignition lag is much affected by turbulence.
10. Usually the spark should occur at about 15° before T.D.C.
11. The correct instant for the introduction of spark is mainly determined by the
12. In general rich mixtures burn faster.
13. For maximum power and economy a slow burning fuel needs a higher spark advance than a fast
burning fuel.
14.
is the ignition of the homogeneous mixture in the cylinder, before the timed ignition spark
occurs, caused by the local overheating of the combustible mixture.
15. Pre-ignition increases the tendency of detonation in the engines.
16. A very sudden rise of pressure during combustion accompanied by metallic hammer like sound
is called
17.
is the rotational flow of charge within the cylinder about its axis.

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