[official][prelims 2023] How was prelims result? In or out?
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HFC is used in lubricants right? Even forum has given a source for this. https://sinopecenergy.com/wp-content/uploads/2015/08/HFC-4631-Water-Glycol-Fire-Resistant-Hydraulic-Fluid.pdf. Pls chk this too. I think answer is all the abouve, though I marked in wrong.
@AureliusM https://sinopecenergy.com/wp-content/uploads/2015/08/HFC-4631-Water-Glycol-Fire-Resistant-Hydraulic-Fluid.pdf
I don't think HFC here means Hydro Fluorocarbon.
@Omen hfc and fluorocarbons are different
It says hydrogenated flourocarbons though
plmokn25688524,
See 
Coaching centres and their irresponsible keys...
HFC in that random article doesn't stand for hydorfluorocarbons at all....It stands for hydraulic fluids. EVerywhere lubricants are a seperate product used in HFC refrigerant systems....Just because HFC and lubricants are appearing in the same place doesn't mean lubricants have hydrofluorocarbons in them.
In contrast, there is a research article which shows how hfc in a lubricant actually decreases its lubricity and increased wear and tear of the machinery.
HFC - Lubricant question.
We need to carefully read the question. The question is not asking whether HFC can be used as lubricant or not. Question is simply asking whether HFC can be used in "making" of Lubricant or not. Catch is in the word "making".
For example Electricity can not be used as lubricant. But Electricity can be used in making of Lubricant. The word "making" has made the question very broad.
Also it is noteworthy that, though HFC can not be directly used as lubricant, but HFCs can be used in making of spray based lubricant. There are many spray type lubricant which uses HFCs.
For reference I'm attaching the question below. You can notice the word "maing" in it.
Q. Consider the following:
1.Aerosols
2.Foam agents
3.Fire retardants
4.Lubricants
In themakingof how many of the above are hydrofluorocarbons used?
By this logic answer should be - "D" (All four correct).
Though UPSC might as well give answer as - "C" (Three pair).
MaximilienRobespierre,HFC - Lubricant question.
We need to carefully read the question. The question is not asking whether HFC can be used as lubricant or not. Question is simply asking whether HFC can be used in "making" of Lubricant or not. Catch is in the word "making".
For example Electricity can not be used as lubricant. But Electricity can be used in making of Lubricant. The word "making" has made the question very broad.
Also it is noteworthy that, though HFC can not be directly used as lubricant, but HFCs can be used in making of spray based lubricant. There are many spray type lubricant which uses HFCs.
For reference I'm attaching the question below. You can notice the word "maing" in it.
Q. Consider the following:
1.Aerosols
2.Foam agents
3.Fire retardants
4.Lubricants
In themakingof how many of the above are hydrofluorocarbons used?
By this logic answer should be - "D" (All four correct).
Though UPSC might as well give answer as - "C" (Three pair).
I think that it is a bit of a stretch. It would imply that HFCs are used in making any good that requires refrigeration.
Averageaspirant,Any chances of the cut off being in the range of 75 to 80? I mean not gng above 80? I mean for gen category.
Which questions are doubtful for you? And have you treated them as negatives or positive while reaching at this score? A lot will depend on this.
If 75-80 is your most conservative estimate, while about 90 is your most optimistic estimate then you might clear. But if 75-80 is the most optimistic estimate, while the most conservative one being less than 70 then it's very tricky situation.
1. stupa
2. literary works- nagasena or nagarjuna
3. Due process of law
4. Prisons
5. Amendment question
6. finance bill/money bill
7.community reserve
8.scheduled areas
9. indian squirell
10.HFCs
11. gandak river
12.carbon markets
13. chad/guinea/mali/sudan
14.besnagar/bhaja/sittanavasal- some are claiming shaivite cave shrine is in besnagar
15. GCM(internal migration)
16.temperature contrast (summer/winter)
17.accelerometer
18.pulsars - right or wrong
19.MSME loans
20. SHG
21. preventive detention/PoTA
42(+14) marks - difference in answer keys of various institutes
https://mde.maryland.gov/programs/workwithmde/Documents/AQCAC_HFC12162019.pdf
This paper clearly shows which hfc can be used as lubricants. So the answer definitely will be D.
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