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Internal Combustion Engines

Internal Combustion Engines
The ignition quality of petrol is expressed by

All of these
Calorific value
Octane number
Cetane number

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Internal Combustion Engines
In order to eliminate knocking in compression ignition engines, there should be

Low compression ratio
Late auto-ignition
Short delay period
High self ignition temperature of fuel

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Internal Combustion Engines
In petrol engines, advancing of the spark timing will ___ the knocking tendency.

Not effect
Increase
Decrease
None of the listed here

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Internal Combustion Engines
The self ignition temperature of petrol is _________ as compared to diesel oil.

Lower
Higher
None of these
Same

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Internal Combustion Engines
The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called

Volumetric efficiency
Indicated thermal efficiency
Overall efficiency
Mechanical efficiency

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Internal Combustion Engines
The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft

2
1
4
43832

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