Ramjet works efficiently at Mach 3 to 6

Q.  Ramjet works efficiently at speeds
- Published on 01 Sep 16

a. Mach 3-6
b. Mach 4-8
c. Mach 1 and above
d. Mach 5 and above

ANSWER: Mach 3-6
 
  • Ramjets work most efficiently at supersonic speeds around Mach 3 (three times the speed of sound) and can operate up to speeds of Mach 6. However, the ramjet efficiency starts to drop when the vehicle reaches hypersonic speeds (above Mach 5).
  • A scramjet engine is an improvement over the ramjet engine as it efficiently operates at hypersonic speeds and allows supersonic combustion. Thus it is known as Supersonic Combustion Ramjet, or Scramjet.
  • A dual mode ramjet (DMRJ) is a type of jet engine where a ramjet transforms into scramjet over Mach 4-8 range, which means it can efficiently operate both in subsonic and supersonic combustor modes.

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