Fuels and Combustion MCQs

Question 1

Gobar gas is produced by the __________ of cown dung.

Accepted Answer

Fermentation

Answer

Oxidation

Answer

Hydrogenation

Answer

None of these

Question 2

Efficiency of the combustion of a fuel is judged by the __________ the flue gas.

Accepted Answer

% of O2 in

Answer

% of CO2 in

Answer

Temperature of

Answer

Colour of

Question 3

The catalyst used in shift converter is

Accepted Answer

Nickel

Answer

Vanadium

Answer

Silica gel

Answer

Alumina

Question 4

Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.

Accepted Answer

CO content

Answer

Dew point

Answer

CO 2 content

Answer

O 2 content

Question 5

Which of the following combustibles is absent in blast furnace gas?

Accepted Answer

CH 4

Answer

H 2

Answer

CO

Answer

None of these

Question 6

A sample of natural gas containing 80% methane (CH 4 ) and rest nitrogen (N 2 ) is burnt with 20% excess air. With 80% of the combustibles producing CO 2 and the reminder going to CO, the Orsat analysis in volume percent is

Accepted Answer

CO 2 : 7.42, CO : 1.86, O 2 : 4.64, N 2 : 86.02

Answer

CO 2 : 6.26, CO : 1.56, O 2 : 3.91, H 2 O : 15.66, N 2 : 72.60

Answer

CO 2 : 6.39, CO : 1.60, O 2 : 3.99, H 2 O : 25.96, N 2 : 72.06

Answer

CO 2 : 7.60, CO : 1.90, O 2 : 4.75, N 2 : 85.74

Question 7

Calorific value of gobar gas (containing CH 4 = 60%, H 2 = 10%, CO 2 = 30%) may be about __________ Kcal/Nm 3 .

Accepted Answer

5400

Answer

1800

Answer

3200

Answer

10200

Question 8

Mott and Wheeler test is conducted on coke to find its

Accepted Answer

Reactivity with O 2

Answer

Abradability

Answer

Phosphorus content

Answer

Volatile matter content

Question 9

Main constituent of natural gas is

Accepted Answer

CH 4 (upto 90%)

Answer

C 2 H 6

Answer

C 3 H 8

Answer

H 2