Related Questions

Rate of low temperature oxidation of coal due to bad storage conditions
A Decreases with increase in surface area
B Does not vary with increase in surface area
C Is more for low volatile coal compared to high volatile coal
D Is accelerated by storage in large heaps with small surface to volume ratio
Low temperature oxidation of coal during storage does not decrease its
A Oxygen content
B Caking power
C Calorific value
D None of these
কোনো প্রকার কুঋণ সমন্বয় করার পূর্বে দেনাদারের পরিমাণ হচ্ছে ২০,৫০০ টাকা। কুঋণ ৫০০ টাকা, কুঋণ সঞ্চিতি ৫৫০ টাকা। দেনাদারের উপর ১০% কুঋণ সঞ্চিতি এবং ৫% বাট্টা সঞ্চিতি ধার্য করা হয়। বাট্টা সঞ্চিতির পরিমাণ কত? (The debtors balance appears at Tk. 20,500 prior to bad debt adjustment. Bad debt expense in Tk.500 and bad debt reserve is Tk. 550. A provision is created for bad debt is 10% and is made for a discount of 5%. What will be reserve for discount in taka?)
A Tk. 2000
B Tk. 2100
C Tk. 950
D Tk. 900
To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in
A Shallow and small piles
B Fine sizes without the presence of any lump
C Closed space without any ventilation facility
D Large heaps with small surface to volume ratio
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if
A It contains large amount of volatile matter
B It is stored in tall heaps
C Smaller fines are stored in large quantity
D All of the above
Low temperature oxidation of coal is accelerated by the
A Storage in large heaps
B Storage in compressed piles
C Absence of porous or friable particles
D All of the above
Low temperature oxidation of stored coal results in the
A Decrease in its caking power & calorific value
B Decrease in its carbon & hydrogen content
C Increase in its oxygen content
D All of the above
'Wind loss' resulting from unscientific storage of coal may be the order of about __________ percent.
A 2.5
B 7.5
C 10.5
D 14.5
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
A 1000
B 4000
C 6000
D 8000
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon
A Is less liable to spontaneous combustion on storage
B Is more difficult to ignite and produces a shorter flame
C Requires smaller combustion space and less secondary air
D None of these

Next steps