Casting, Forming and Welding Multiple Choice Questions & Answers (MCQs) on ” Gas-Vapour Cured Resin Binders”.
1. Which of the following is an advantage of high volume core production?
a) Durability
b) High strength
c) Low cost
d) Cures low volume production
Answer: c
Clarification: The very basic requirements of high volume core production is, low cost and fast manufacturing.
2. High volume mould production is done using which sand?
a) Green sand
b) Dry sand
c) Loam sand
d) Sharp sand
Answer: a
Clarification: When it comes to the production of high volume core productions, the cost essentially should be low. High volume mould production is done using green sand only.
3. Which of the following is not an advantage in low volume core production?
a) High production
b) Consistency
c) Mould rigidity
d) Hardenability
Answer: d
Clarification: In low volume core production, it offers high rate of production, better consistency and mould rigidity, but not hardenability.
4. Which of the following is not an advantage of moderate to high volume aluminium castings?
a) Growth in low pressure
b) Flexibility
c) Low cost
d) Low brittleness
Answer: d
Clarification: In moderate to high volume aluminium castings, low pressure growth, flexibility and lower costs is an advantage, but not low brittleness.
5. What does LPS stand for?
a) Limited Production Sand casting
b) Low Pressure System
c) Limited Production System
d) Low Pressure Sand casting
Answer: d
Clarification: LPS stands for Low Pressure Sand Casting. The growth in LPS in mainly found to be used only in for the cylindrical blocks and heads.
6. What is mixed with calcium hydroxide on sand for CO2 cured polyacrylate?
a) Sodium polyacrylate
b) Calcium polyacrylate
c) Aluminium polyacrylate
d) Iron polyacrylate
Answer: a
Clarification: According to the reaction, sodium polyacrylate is mixed with calcium hydroxide (CaOH2) on sand and is later cured with carbon dioxide gas.
7. In Amine cured phenolic urethane, what is used as the catalyzing reagent?
a) Primary amine
b) Secondary amine
c) Tertiary amine
d) Nitrogen dioxide
Answer: c
Clarification: In amine cured phenolic urethane, a tertiary vaporized amine is used as a catalyst and is therefore, used for the catalyzation of the reaction.
8. What reacts with polyether phenolic resin to give polyurethane structure?
a) Diphenyl methane diisocynate
b) Triphenyl ethane diisocynate
c) Diphenyl ethane diisocynate
d) Triphenyl methane diisocynate
Answer: a
Clarification: In amine cured phenolic urethane, a tertiary vaporized amine is used to catalyze the reaction between polyether phenolic resin and Diphenyl methane diisocynate to give out polyurethane structure.
9. In Ester cured alkaline phenolic, what is used as a coreactant?
a) A phenol
b) A ketone
c) An ester
d) An aldehyde
Answer: c
Clarification: In Ester cured alkaline phenolic, there is an ester called methyl formate, which is usually used as a coreactant.
10. Green sand has high volume production rate than gas-vapour cured system.
a) True
b) False
Answer: b
Clarification: The production rate in gas and vapour cured system, is comparatively lower than that of green sand.