Internal Combustion Engines
The purpose of testing an internal combustion engine is

To satisfy the customer regarding the performance of the engine
To determine the information, which cannot be obtained by calculations
To conform the data used in design, the validity of which may be doubtful
All of these

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Internal Combustion Engines
The expansion of fuel in a four stroke cycle diesel engine

May start and end anywhere
Starts at 15° after top dead center and ends at 30° before bottom dead center
Starts at 15° before top dead center and ends at 30° after top dead center
Starts at top dead center and ends at 30° after top dead center

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Internal Combustion Engines
For the same compression ratio

Diesel cycle is more efficient than Otto
Compression ratio has nothing to do with efficiency
Otto cycle is more efficient than the Diesel
Both Otto and Diesel cycles are, equally efficient

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