Coal interview questions
Coal interview questions
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Total Questions: 15
1. In proximate analysis, which of the following elements can be found?
Correct Answer is : % of moisture content
2. From the raw piece, coal is manufactured by________
Correct Answer is : perfectly crushed
3. The moisture content in the coal can be given by heating the coal for _____ hours.
Correct Answer is : 1
4. To find the % of volatile matter in coal, it must be heated in the crucible at ______ temperature.
Correct Answer is : 9250C+200C
5. To calculate the % of ash content the dry coal is heated in ____________
Correct Answer is : muffle furnace
6. The % of the fixed carbon can be given by:
Correct Answer is : %C=100-(% of moisture+% of volatile matter+% of ash)
7. High % of moisture is undesirable because _________
Correct Answer is : increases the cost of transport
8. The moisturizing the coal before introducing into furnace is called as:
Correct Answer is : tempering
9. Ultimate analysis of coal is also called as:
Correct Answer is : qualitative analysis
10. In determination of % of C and H, the coal is burnt in the stream of _______
Correct Answer is : pure oxygen
11. % of nitrogen can be determined by the process:
Correct Answer is : kjeldahl’s method
12. During metallurgical operations, n2 causes ___________
Correct Answer is : hardness to sample
13. Weight of the coal is 2g and after heating the coal sample, the weight of the coal is 1.82g. What is the % of the moisture in coal?
Correct Answer is : 0.09
14. Find the % of C from following data: % of moisture:10g % of volatile matter:9.5g % of ash:11.6g
Correct Answer is : 68.9g
15. An increase in 1% of percentage of oxygen decreases the calorific value by ________
Correct Answer is : 0.017
