Rolling up the windows and replacing outside mirrors with inside mirror can redu

Question

Rolling up the windows and replacing outside mirrors with inside mirror can reduce aerodynamic drag, and improve fuel efficiency. To reduce rolling drag, it is best to keep tires under-inflated. For ships and boats moving at low speeds, viscous drag accounts for most of the resistance. A rotary engine works similarly to a reciprocating engine, except the piston is substituted with triangular rotor. Gas turbines have relatively lower emissions then gasoline and diesel engines. The higher the C/H ratio, the cleaner the fuel. Electric motors produce maximum torque at cruising speeds. Gasoline engines are most efficient at cruising speeds. Conventional vehicles produce a large amount of HC and CO during cold starts, acceleration, and braking. In a series hybrid configuration, all motive power comes from the electric motor powered by batteries.

Explanation / Answer

Statement 1 True because it reduces the front area and hence the drag

Statement 2 False becuse under inflated tyres has less radius this icreases the drag.

Statement 3 False viscous drag will be more dominant at high speed.

Statement 4. True

Statement 5. True

Statement 6. True

Statement 7. True

Statement 8. False

Statement 9. True

Statement 10. False

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