Which of the following zones is not a part of the thrust chamber?

Atomization zone

Transonic flow zone

Rapid-combustion zone

Stream tube combustion zone

Correct Answer : Atomization zone

Explanation : Atomization zone lies in front of the thrust chamber. Out of the remaining options, transonic flow zone lies in the nozzle while the rest of them are in the combustion chamber region.

Recently Updated in Rocket Propulsion Questions

Which of the following combustion instabilities happen due to propellant flow rate disturbances?

Pogo

Screaming

Screeching

Entropy waves

Correct Answer : Option (A) : Pogo

Explanation : Pogo instability is a longitudinal instability due to propellant flow rate disturbances. They are low-frequency waves, usually lying in the 10-50 Hz frequency zone.

Which of the following combustion instabilities occur due to propellant pump cavitation?

Pogo

Buzzing

Chugging

Screaming

Correct Answer : Option (C) : Chugging

Explanation : Chugging can occur in test facilities due to the propellant pump cavitation. It can also happen due to gas entrapment in propellant flow or due to tank pressurization control fluctuations.

high-frequency combustion instability is called ________

buzzing

chugging

entropy waves

squealing

Correct Answer : Option (D) : squealing

Explanation : Squealing is the term used to denote combustion instabilities with high-frequency of occurrence of fairly large concentrations of vibratory energy. The frequency range lies above 1000 Hz. It is also called screaming.