This set of Casting Questions and Answers for Aptitude test focuses on “Comparative Properties Of Gas-Vapour Cured Resin Binders”.
1. Which of the following is produced by Novalak – acid system?
b) Carboxylic acid
Explanation: 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
Explanation: 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
Explanation: Under casting performance of phenolic – urethane cores, having good hardenability does not come under it.
Explanation: In the given figure, phenolic urethane has shown a good performance in transverse strength. The first column is indicating the answer here.
Explanation: 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.
Explanation: Novalak-acid, in the given figure has shown a good performance in transverse strength. For novalak-acid system, the column 4 can be considered.
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
Explanation: In the given figure, alkaline phenolic-CO2 cured, has shown a poor performance in transverse strength.
10. Epoxy – acrylate requires SO2 for curing.
Explanation: 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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