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

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

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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Inject fuel at a high velocity to facilitate atomization
Ensure that penetration is not high
Inject fuel in a chamber of high pressure at the end of compression stroke
All of these

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