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Internal Combustion Engines

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

Octane number
None of the listed here
Cetane number
Calorific value

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Internal Combustion Engines
Alpha-methyl-naphthalene (C11H10) has a cetane number of

50
120
0
100

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Internal Combustion Engines
If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have

Dynamic similarity
Geometric similarity
None of these
Kinematic similarity

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Internal Combustion Engines
A diesel engine has compression ratio from

25 to 40
10 to 15
6 to 10
15 to 25

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Internal Combustion Engines
Iso-octane (C₈H₁₈) has octane number of

120
50
0
100

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Internal Combustion Engines
The pressure and temperature at the end of compression stroke in a petrol engine are of the order of

20-30 kg/cm² and 450-500°C
12-20 kg/cm² and 350-450°C
6-12 kg/cm² and 250-350°C
4-6 kg/cm² and 200-250°C

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