Standard Book, Technical General
Piston Engines - Performance and Power Augmentation: DGCA Technical General questions
A normally aspirated engine loses power as it climbs into thinner air. Superchargers and turbochargers fight that loss by compressing the induction air, raising manifold pressure, or boost. An internal supercharger is geared to the crankshaft; a turbocharger is spun by exhaust gas.
The 61 questions centre on the wastegate, automatic boost control, rated altitude, intercoolers and the diffuser. Exam sessions have used 7 of these supercharging questions.
Closing the wastegate sends more exhaust through the turbine and raises boost; opening it does the opposite. A wastegate stuck open lets boost fall as height increases, and one stuck closed can overboost the engine. The diffuser turns kinetic energy into pressure, and detonation is the main limit on boost.
0 answered·5 free questions·0 right
Question 1 of 5
The wastegate is operated by:
Question 2 of 5
The primary purpose of a supercharger is to:
Question 3 of 5
If the wastegate of a turbocharged engine seizes in the climb before critical altitude has been reached:
Question 4 of 5
An internal supercharger is one which:
Question 5 of 5
The compressor output pressure of an internal supercharger is:
56 more questions in this chapter
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