Fuels and Combustion MCQs

Question 1

Bunsen burner is an example of a/an __________ burner.

Accepted Answer

Inside mixing/premix type

Answer

Outside mixing/diffusion flame/nozzle mix type

Answer

Rotary cup

Answer

Submerged combustion

Question 2

Stack (chimney) height in a big thermal power plant is dictated by the

Accepted Answer

Draught to be created

Answer

Pollution control aspect

Answer

Limitation of constructional facilities

Answer

None of these

Question 3

Undercharging of coal in the by-product coke ovens results in

Accepted Answer

Decrease in the c.v. of coke oven gas

Answer

Increase in its throughput

Answer

Increase in the c.v. of coke oven gas

Answer

No change in the c.v. of coke oven gas

Question 4

Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?

Accepted Answer

Bag filter

Answer

Multicyclones

Answer

Wet scrubber

Answer

Hydrocyclones

Question 5

With increase in calorific value of fuels, their adiabatic flame temperatures

Accepted Answer

May increase or decrease ; depends on the quantity of products of combustion

Answer

Increase

Answer

Decrease

Answer

Remain unchanged

Question 6

Calorific value of tar is about __________ Kcal/kg.

Accepted Answer

8800

Answer

12000

Answer

5000

Answer

16000

Question 7

Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.

Accepted Answer

25

Answer

5

Answer

55

Answer

75

Question 8

Which of the following is used for making the explosive 'TNT'?

Accepted Answer

Toluene

Answer

Benzol

Answer

Pyridine

Answer

Cerosote

Question 9

'Wind loss' resulting from unscientific storage of coal may be the order of about __________ percent.

Accepted Answer

2.5

Answer

7.5

Answer

10.5

Answer

14.5