Series sequential turbochargers are described as having which configuration?

• A. Two compressor wheels and one turbine wheel
• B. Two separate compressor housings and two separate turbine housings
• C. One compressor wheel and two turbine wheels
• D. Three compressor wheels and two turbine wheels

Answer: (A)

In a series sequential turbo setup, boost comes from two compressors arranged in series that are powered by a single turbine wheel on one shaft. The exhaust drives that one turbine, which spins both compressors in sequence so air first passes through a smaller, quick-spooling compressor and then a larger one for higher pressure. This combination gives fast response at low engine speeds and higher boost at higher speeds without needing two separate turbines. So the defining configuration is two compressor wheels on one shaft driven by one turbine wheel. The other options describe setups with separate turbines or multiple turbines feeding a single compressor, which aren’t how series sequential turbochargers are arranged.