In which of the zones does any remaining liquid droplets of the propellants get vaporized by convective heating?

Transonic-flow zone

Rapid combustion zone

Supersonic expansion zone

Stream tube combustion zone

Correct Answer : Rapid combustion zone

Explanation : Any remaining liquid droplets of propellants get vaporized by convective heating in the rapid combustion zone. In this zone, intensive chemical reactions take place at an increasingly higher temperature.

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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.