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.
To practice all areas of Rocket Propulsion, here is complete set of 1000+ Multiple Choice Questions and Answers.
Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!