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
None of these
Geometric similarity
Kinematic similarity

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Internal Combustion Engines
Scavenging air in diesel engine means

Burnt air containing products of combustion
Air used for combustion sent under pressure
Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Forced air for cooling cylinder

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