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Question
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the
Options
A. density separation.
B. differential wettability.
C. size.
D. volatile matter content.
Correct Answer
density separation.
More questions
1. Which of the following is not a high alumina refractory material?
Options
A. Kyanite
B. Sillimanite
C. Diaspore
D. Periclase
Show Answer
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Discuss
Correct Answer: Periclase
2. Which of the following is not a mechanical pressure sensing element?
Options
A. Bellows
B. Diaphragm
C. Bourdon tube
D. U-tube
Show Answer
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Discuss
Correct Answer: U-tube
3. Which is not accomplished in an underfired furnace?
Options
A. Increase in heating capacity/m
2
of floor space.
B. Elimination of cold spot at the bottom of the charge.
C. Reduction in the temperature of furnace gases.
D. Portection of the periphery of the charge from excessive radiation.
Show Answer
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Discuss
Correct Answer: Increase in heating capacity/m
2
of floor space.
4. There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
Options
A. Mercury
B. Arsenic
C. Aluminium
D. Lead
Show Answer
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Discuss
Correct Answer: Aluminium
5. Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves?
Options
A. High refractoriness.
B. High resistance to spalling.
C. High strength and density.
D. All (a), (b) and (c).
Show Answer
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Correct Answer: High refractoriness.
6. What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?
Options
A. 0.1
B. 3
C. 13
D. 29
Show Answer
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Correct Answer: 13
7. Which of the following is the most severe air pollutant?
Options
A. hydrocarbons
B. NO
x
C. SO
2
D. CO
Show Answer
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Discuss
Correct Answer: NO
x
8. Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?
Options
A. Thermosphere
B. Troposphere
C. Stratosphere
D. none of these
Show Answer
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Correct Answer: Troposphere
9. Which is the stable form of silica upto 1470°C?
Options
A. Quartz
B. Cristobalite
C. Tridymite
D. None of these
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Correct Answer: Tridymite
10. Which of the following does not figure in the list of seven substances selected for international temperature scale?
Options
A. Ice (F.P) and steam (B.P)
B. Oxygen and sulphur (B.P)
C. Antimony and silver (F.P)
D. Zinc (B.P) and mercury (F.P)
Show Answer
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Discuss
Correct Answer: Zinc (B.P) and mercury (F.P)
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