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Question 1: Similarly, overhead cams and multiple valves per cylinder were introduced, while automobile engines continued to use ________ and didn't widely use more than two valves per cylinder until the 1990s.
Engine displacementOverhead valveIgnition systemManifold (automotive)

Question 2: 1960s: TF39 ________ enters service delivering greater thrust and much better efficiency
TurbojetTurbofanTurbopropTurboshaft

Question 3: Limited experiments with solar electric propulsion have been performed, notably the manned Solar Challenger and unmanned ________ aircraft.
Space ShuttleNASA PathfinderDeep Space NetworkApollo program

Question 4: The ________ is about one half the weight and size of a traditional four stroke cycle piston engine of equal power output, and much lower in complexity.
Wankel engineTwo-stroke engineRotary engineFour-stroke engine

Question 5: Currently the most common Avgas is 100LL, which refers to the ________ (100 octane) and the lead content (LL = low lead).
Spark plugInternal combustion engineGasolineOctane rating

Question 6: A turbojet is a type of gas turbine engine that was originally developed for military fighters during ________.
Collaboration with the Axis Powers during World War IISoviet occupationsWorld War IISecond Sino-Japanese War

Question 7: A few aircraft have used rocket engines for main thrust or attitude control, notably the ________ and North American X-15.
Bell X-2Bell X-1Bell X-22Bell X-5

Question 8: A radial engine has only one crank throw per row and a relatively small crankcase, resulting in a favorable ________.
AutomobileDiesel engineFuel cellPower-to-weight ratio

Question 9: The power of an internal combustion reciprocating or turbine aircraft engine is rated in units of power delivered to the propeller (typically horsepower) which is torque multiplied by ________ revolutions per minute (RPM).
CrankshaftTwo-stroke engineConnecting rodOil pump (internal combustion engine)

Question 10: Considerable development of these designs started after ________, but at the time the aircraft industry favored the use of turbine engines.
Soviet occupationsWorld War IICollaboration with the Axis Powers during World War IISecond Sino-Japanese War
















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