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Internal Combustion Engines

Internal Combustion Engines
The ignition quality of diesel oil is expressed by

None of the listed here
Calorific value
Octane number
Cetane number

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Internal Combustion Engines
The inlet valve of a four stroke cycle internal combustion engine remains open for

130°
230°
180°
270°

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Internal Combustion Engines
If the speed of the engine is increased, the indicated power will

Increase
None of these
Remain same
Decrease

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Internal Combustion Engines
In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have

All of these
Long ignition delay
Low temperature
Low density

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Internal Combustion Engines
The fuels in order of decreasing knock tendency for spark ignition engines are

Paraffin, aromatic, napthene
Paraffin, napthene, aromatic
Napthene, paraffin, aromatic
Napthene, aromatics, paraffin

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Internal Combustion Engines
The reference fuels for knock rating of spark ignition engines would include

Normal octane and aniline
Iso-octane and normal hexane
Normal heptane and iso-octane
Iso-octane and alpha-methyl naphthalene

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