Within each pair configuration of two exhaust gas turbochargers a pumping effect or even a collapse of {TAIL ~ the charge air flow} because of the sequential switching on and switching off of an exhaust gas turbocharger is prevented in that the small compressor positioned in {HEAD ~ the vicinity} of the engine, which is first operated alone, will take in its air through the greater compressor that is serially connected upstream thereof, and this greater compressor will force additional charge air through the smaller compressor upon being switched on 
Within each pair configuration of two exhaust gas turbochargers a pumping effect or even a collapse of { TAIL ~ the charge air flow } because of the sequential switching on and switching off of an exhaust gas turbocharger is prevented in that the small compressor positioned in { HEAD ~ the vicinity } of the engine , which is first operated alone , will take in its air through the greater compressor that is serially connected upstream thereof , and this greater compressor will force additional charge air through the smaller compressor upon being switched on
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