Aerodynamic resistance dominates all other resistances in vehicles :(A)cruising

Question

Aerodynamic resistance dominates all other resistances in vehicles :(A)cruising at speeds below 40km/hr (25 mph); (B) only during stop-and-go traffic; (C) during acceleration; (D) at speeds exceeding 40km/hr (25 mph); (E) never, it is always less than rolling resistance. The main strokes of a 4-stroke, internal combustion engine are: (A) intake, expansion, compression, and exhaust ;(B) compression, ignition, expansion, and exhaust; (C) intake, compression, power, and exhaust; (D) intake, compression, ignition, and expansion; (E) intake, ignition, expansion, and exhaust.. The power required to propel a vehicle over a given distance can be calculated as: (A) speed divided by distance; (B) speed times distance; (C) power times distance; (D) force times distance; (E) force times speed. Which of the following is not considered an internal combustion engine: (A) diesels using synthetic biofuels; (B) gasoline engines; (C) gas turbines; (D) steam turbines; (E) all are internal combustion engines. Fuel cells are regarded as promising technology because: (A) they were used in the space program; (B) they use fossil fuel; (C) their only by-product is water; (D) they are cheap to produce; (E) we have huge reserves of hydrogen.

Explanation / Answer

1.D.At low speeds rolling is dominant

2.C.Intake compression,power,exhaust

3.E.Force *speed

4.D.Steam turbine is external combustion

5.E.Huge reserve of hydrogen

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