250+ TOP MCQs on Inorganic Chemical – Propellants and Answers

Chemical Industry Multiple Choice Questions on “Inorganic Chemical – Propellants”.

1. Nitromethane is which type of propellants?
a) Monopropellants
b) Bipropellant
c) Solid propellants
d) Liquid propellants

Answer: d
Clarification: Liquid propellants are two types- homogeneous and compound. Nitromethane and ethyl nitrate comes under the categories of homogeneous liquid propellants and liquid ammonia, ammonium nitrate comes in compound propellants.

2. What is ‘hydrazine’?
a) Hypergolic material
b) Non-hypergolic material
c) Principal oxidizers
d) Principal fuels

Answer: d
Clarification: In liquid propellants, kerosene (JP-4), hydrazine,liquid H₂ are used as principal fuels while H₂O₂, HNO₃, N₂O₄, liquid O₂ and liquid F₂ are used as principal oxidizers.

3. Which one is not an ideal performance criterion for propellants?
a) Non-corrosive
b) Low toxicity
c) Low density
d) High heat of reaction

Answer: c
Clarification: Ideal performance criteria for propellants are- high heat of reaction, low molecular weight combustion products, high density, non-corrosive, low toxicity, readily ignitable and low cost.

4. What is the major disadvantage associated with solid propellants compared to liquid propellants?
a) Temperature sensitivity
b) High pressure
c) Low pressure
d) Insensitive to friction

Answer: a
Clarification: The burning rate in solid propellants is dependent upon the prior storage temperature. This temperature sensitivity is a major disadvantage of solid propellants when compared with liquid propellants.

5. Ammonia-sodium hypochlorite process is associated with which type of propellants production?
a) Boron-hydrogen compounds
b) HNO₃
c) N₂O₄
d) Hydrazine

Answer: d
Clarification: Hydrazine is produced by this ammonia-sodium hypochlorite process where anhydrous NH₃ is injected into aqueous chloramine solution to give molar excess of NH₃.

6. Which process is used in sodium hypochlorite process to produce final product of anhydrous hydrazine?
a) Azeotropic distillation
b) Evaporation
c) Continuous distillation
d) Batch distillation

Answer: a
Clarification: In ammonia- sodium hypochlorite process anhydrous hydrazine is produced by an azeotropic distillation process using aniline which takes the water overhead as an aniline water azeotrope.

7. How methyl borate is prepared?
a) CH₃OH + B₂
b) CH₃OH + B₃H₃O₆
c) CH₃OH + B₃H₃
d) CH₃OH + B₂O₄

Answer: b
Clarification: Methyl borate is prepared by the reaction of methanol with metaboric acid. Sodium hydride is prepared as dispersion and added to a jacket reactor along with methyl borate and resulting sodium borohydride reaction.

8. In which type of burning process of solid propellants usually a solid grain is used?
a) Progressive burn
b) Digressive burn
c) Neutral burn
d) Natural burn

Answer: b
Clarification: In digressive burn of solid propellants usually a solid grain in the shape of a cylinder or sphere is used. In progressive burn usually a grain with multiple perforations or a star cut in the centre providing a lot of surface area is used.

9. Polysulfide is which types of propellants?
a) Composite propellants
b) cmdb
c) Single base propellants
d) Double base propellants

Answer: a
Clarification: Composite propellants are solid rocket fuels, consisting of oxygen donating inorganic salts and a binder made of plastics. The polymeric binders include polysulfide’s, polybutadiene etc.

10. What is HTPB?
a) An oxidizer
b) A metallic fuel
c) Curing agents
d) Binder

Answer: d
Clarification: Basically HTPB(Hydroxy-terminated polybutadiene) is one of a binder. Binders are composition that hold together a charge of finely divided particles and increased mechanical strength of the resulting propellant hrain.