For an adapted rocket engine with fixed geometry, thrust, chamber pressure, increasing the mixture ratio past the stochiometric point towards richer mixture:Group of answer choicesIncreases the mass flow requiredRequires zero mass flowReduces the mass flow requiredDoes not affect the mass flow requirements

In a rocket engine running with {H2+0.3O2}, for the same engine pressure and mass flow, the adapted raw thrust:Group of answer choicesWill be lower changing to a rich hydrocarbon/oxygen mixtureWill be higher changing to rich hydrocarbon/oxygen mixtureIs not affected by the choice of mixtureRequires a fuel air ratio of 2

For a choked purely-converging nozzle fed by a reservoir of fixed composition and temperature, as the nozzle pressure ratio Pb/P0 is decreased, the mass flow rate through the nozzle:Group of answer choicesAlways increasesIncreases only if Pb is reducedIncreases only if P0 is increasedAlways constant

The momentum thrust of a choked purely-converging nozzle of fixed area, fed by a reservoir of fixed composition and temperature:Group of answer choicesIncreases with increasing reservoir pressureRemains constant with decreasing backpressureAll of the aboveNone of the above

A cold-water stream at 400C and 100 kPa enters a mixing chamber with a mass flow rate of 0.46 kg/s, where it is mixed with a stream of hot water at 900C and 300 kPa. If the mixture is desired to leave the chamber at 500C and 275 kPa, determine the mass flow rate of the mixture stream in kg/s.

A cold-water stream at 400C and 100 kPa enters a mixing chamber with a mass flow rate of 0.38 kg/s, where it is mixed with a stream of hot water at 900C and 300 kPa. If the mixture is desired to leave the chamber at 500C and 275 kPa, determine the mass flow rate of the hot water stream in kg/s.