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Internal Combustion Engines

Internal Combustion Engines
The advancing of spark timing in spark ignition engines will ___ knocking tendency.

Not effect
Reduce
None of the listed here
Increase

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Internal Combustion Engines
The increase of cooling water temperature in petrol engine will _________ the knocking tendency.

Decrease
Not effect
Increase
None of these

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Internal Combustion Engines
Crankcase explosion in I.C. engines usually occurs as

Both mild and big explosions occurs simultaneously
First a mild explosion followed by a bi explosion
Never occurs
First a big explosion followed by a mil explosion

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

None of the listed here
Octane number
Cetane number
Calorific value

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Internal Combustion Engines
The thermal efficiency of diesel engines on weak mixtures is

Lower
Higher
Dependent on other factors
Unaffected

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Internal Combustion Engines
Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio provided

It is properly designed
Best quality fuel is used
Cannot work as it is impossible
Flywheel size is proper

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