Rocket Propulsion Questions and Answers – Chemical Rocket Propellant – Results of Thermochemical Calculations

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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

Answer: d
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.
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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

Answer: a
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

Answer: a
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

Answer: a
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.
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5. 1-methyl-1, 2-dicyclopropyl cyclopropane is also called as ____________
a) Syntin
b) Kerosene
c) RP-1
d) Jet fuel
View Answer

Answer: a
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

Answer: c
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

Answer: d
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.
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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn