Chemical Engineering Archives

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.

2292. Which of the following is a component of working capital investment ?

Utilities plants.

Maintenance and repair inventory.

Process equipments.

Depreciation.

✅ The correct answer is option B.

2293. ‘Lang factor’ is defined as the ratio of the capital investment to the delivered cost of major equipments. The value of ‘Lang factor’ for fixed capital investment, for a solid-fluid processing chemical plant ranges from

1.2 to 1.4

2.5 to 2.7

4.2 to 4.4

6.2 to 6.4

✅ The correct answer is option C.

2294. Turn down ratio of a burner

Should be as low as possible i.e., 1 : 2

Should be 1:1 for a batch type furnace.

Is the ratio of maximum to minimum permissible heat input rates

Is normally much more for a continuous furnace as compared to a batch furnace

✅ The correct answer is option C.

2295. A present sum of Rs. 100 at the end of one year, with half yearly rate of interest at 10%, will be Rs.

121

110

✅ The correct answer is option A.

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.

2297. Reducing atmosphere is maintained in a

Calcination kiln

Blast furnace

Soaking pit

L.converter

✅ The correct answer is option B.

2298. In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of

Use of non-preheated combustion air

Use of pulverised solid fuels

Imperfect mixing of fuel & air and infiltration of air

Use of excessive positive draft in the furnace

✅ The correct answer is option C.

2299. A machine has an initial value of Rs. 5000, service life of 5 years and final salvage value of Rs. 1000. The annual depreciation cost by straight line method is Rs.

300

600

800

1000

✅ The correct answer is option C.

2300. The reason for excessive clinker formation in gas producers is the

Use of coal/coke containing a high % of fines and ash

Use of fuel having too low an ash fusion temperature

Development of hot spots in the fuel bed and an abnormally high rate of gasification

All of the above

✅ The correct answer is option D.