This set of Rocket Propulsion Multiple Choice Questions & Answers focuses on “Chemical Rocket Propellant – Results of Thermochemical Calculations”.
1. Dissociation of the reaction products __________ with the rise in the chamber temperature and _________ with the rise in chamber pressure of a chemical rocket engine.
a) increases, increases
b) decreases, increases
c) decreases, decreases
d) increases, decreases
View Answer
Explanation: Higher chamber temperature results in higher dissociation of the reaction products. But the dissociation can be suppressed by an increase in the chamber pressure.
2. Which of the following is a highly refined form of kerosene used as rocket fuel?
a) RP-1
b) HMX
c) RDX
d) C-4
View Answer
Explanation: RP-1 is a highly refined form of kerosene. It is short for Rocket Propellant-1 or Refined Petroleum-1. A part of RP-1 includes toxic and carcinogenic hydrazine.
3. Which of the following fuels were used in the first stage of Titan I?
a) RP-1
b) RDX
c) HMX
d) LH2
View Answer
Explanation: RP-1 fuel is used in the first stage of Titan 1. Other than that, it was also used in the first stages of Saturn V, Energeia, Saturn I and IB etc. It is a cheaper and less explosive alternative to LH2.
4. The fuel which releases the most energy per unit mass of combustion is ____________
a) LH2
b) RP-1
c) Kerosene
d) Methane
View Answer
Explanation: Compared to hydrocarbon fuels, liquid hydrogen delivers most energy per unit mass of combustion. Any hydrocarbon fuel, when subjected to combustion produces more pollution than LH2.
5. 1-methyl-1, 2-dicyclopropyl cyclopropane is also called as ____________
a) Syntin
b) Kerosene
c) RP-1
d) Jet fuel
View Answer
Explanation: Syntin is a high-energy formulation briefly used in the upper stages of rockets developed by the Soviet Union. Its molecular formula is C10H16 and it is a mixture of 4 stereoisomers.
6. ____________ is not a metallic additive in rocket propellants.
a) Beryllium
b) Aluminum
c) Nitroglycerine
d) Boron
View Answer
Explanation: Nitroglycerine is a dense, colorless, explosive liquid. Its chemical formula is C3H5N3O9. It is neither metallic nor an additive.
7. Knocking in spark-ignition internal combustion engines is not the same as ____________
a) detonation
b) pinging
c) pinking
d) pre-ignition
View Answer
Explanation: Knocking and pre-ignition are two separate events. Knocking happens when the combustion of some of the air-fuel mixture doesn’t occur because of the propagation of flame front due to spark-plug ignition, but when one or more air-fuel mixture pockets explode outside the normal combustion front. Pre-ignition refers to the case in which combustion happens even before the spark-plug fires.
Sanfoundry Global Education & Learning Series – Rocket Propulsion.
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