Casting Questions and Answers for Aptitude test on “Comparative Properties Of Gas-Vapour Cured Resin Binders”.
1. Which of the following is produced by Novalak – acid system?
a) Ketone
b) Carboxylic acid
c) Ester
d) Aldehyde
Answer: d
Clarification: The novalak – acid system produces formaldehyde, which by the name suggests is an aldehyde and methanol while production of cores.
2. The novalak – acid system needs what temperature conditions?
a) 15°C – 25°C
b) 25°C – 35°C
c) 35°C – 45°C
d) 45°C – 55°C
Answer: c
Clarification: The novalak – acid system needs to be operated in between the temperature range of 35°C – 45°C. When this system gets operated in these temperature ranges, it is observed to yield best results.
3. Which of the following is not a casting performance of phenolic – urethane cores?
a) Moderate hot strength
b) Good hardenability
c) Surface finish
d) Low nitrogen level
Answer: b
Clarification: Under casting performance of phenolic – urethane cores, having good hardenability does not come under it.
4. In the given figure, phenolic urethane has what kind of a performance in transverse strength?
a) Good performance
b) Moderate performance
c) Poor performance
d) Did not perform
Answer: a
Clarification: In the given figure, phenolic urethane has shown a good performance in transverse strength. The first column is indicating the answer here.
5. In the given figure, Epoxy-acrylate has what kind of a performance in transverse strength?
a) Good performance
b) Moderate performance
c) Poor performance
d) Did not perform
Answer: a
Clarification: In the given figure, epoxy-acrylate has shown a decently good performance in transverse strength. For epoxy acrylate, one may look at the second column.
6. In the given figure, novalak-acid has what kind of a performance in transverse strength?
a) Good performance
b) Moderate performance
c) Poor performance
d) Did not perform
Answer: a
Clarification: Novalak-acid, in the given figure has shown a good performance in transverse strength. For novalak-acid system, the column 4 can be considered.
7. In the given figure, alkaline-phenolic has what kind of a performance in transverse strength?
a) Good performance
b) Moderate performance
c) Poor performance
d) Did not perform
Answer: b
Clarification: None.
8. In the given figure, alkaline phenolic – CO2 cured has what kind of a performance in transverse strength?
a) Good performance
b) Moderate performance
c) Poor performance
d) Did not perform
Answer: c
Clarification: In the given figure, alkaline phenolic-CO2 cured, has shown a poor performance in transverse strength.
9. In the given figure, polyacrylate – CO2 cured, has what kind of a performance in transverse strength?
a) Good performance
b) Moderate performance
c) Poor performance
d) Did not perform
Answer: c
Clarification: None.
10. Epoxy – acrylate requires SO2 for curing.
a) True
b) False
Answer: a
Clarification: Sulphur dioxide is by nature an acidic compound. Epoxy-acrylate largely needs sulphur dioxide for its curing, needing good control of it.
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Casting for Aptitude test,