2263. Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
20
40
60
80
✅ The correct answer is option D.
2268. Following the six-tenth factor rule, if a log-log plot of capacity of the equipment vs. cost of the equipment is made, then a straight line is obtained, whose slope is equal to
0.1
0.6
0.2
0.8
✅ The correct answer is option B.
2272. An example of shaft furnace is the
L.converter
Glass melting tank
Blast furnace
Soaking pit
✅ The correct answer is option C.
2276. “Break-even point” is the point of intersection of
fixed cost and total cost.
total cost and sales revenue.
fixed cost and sales revenue.
none of these.
✅ The correct answer is option B.
2281. The main function of a muffle in the muffle furnace is to
Protect the charge from the effects of the products of combustion
Smooth out temperature inequalities on the combustion side of the muffle wall
Both A & B
Neither A nor B
✅ The correct answer is option C.
2286. To reduce the stack loss, heat recovery from flue gas can be done by
Preheating of cold stock
Preheating of combustion air
Steam generation in waste heat boilers
All of the above
✅ The correct answer is option D.
2291. A reactor having a salvage value of Rs. 10000 is estimated to have a service life of 10 years. The annual interest rate is 10%. The original cost of the reactor was Rs. 80000. The book value of the reactor after 5 years using sinking fund depreciation method will be Rs.
40096
43196
53196
60196
✅ The correct answer is option D.
2296. Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.
Oct-15
25-30
45-50
65-70
✅ The correct answer is option B.
2301. Relative cost of chemical process plants in India is about __________ percent more than the similar plants in U.S.A.
15
35
55
75
✅ The correct answer is option B.
2306. Use of pulverised coal in boilers provides
Higher calorific value
Better combustion
Smokeless burning
Less erosion on furnace wall
✅ The correct answer is option B.