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A ramjet produces no thrust at rest because

  • A.Its combustor is too small
  • B.It depends entirely on forward speed for its compression
  • C.Its fuel will not ignite at low speed
  • D.Its nozzle is closed at rest

Answer: B

With no compressor there is nothing to raise the pressure when the aircraft is stationary. The engine must be accelerated to a useful speed by a rocket booster or a separate engine before it can begin to produce thrust of its own.

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