Fuels and Combustion MCQs

Question 1

Main use of hard coke produced by high temperature carbonisation is in the

Accepted Answer

Iron blast furnace

Answer

Cupola in foundaries

Answer

Sinter making

Answer

Domestic ovens

Question 2

Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.

Accepted Answer

80-170

Answer

200-300

Answer

250-270

Answer

280-300

Question 3

In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the

Accepted Answer

Aromatic content of tar produced is more

Answer

Gas yield is less

Answer

Tar yield is more

Answer

Ignition temperature of coke produced is less

Question 4

Which of the following is a single stage, fixed bed high pressure coal gasification process?

Accepted Answer

Lurgi Process

Answer

Winkler process

Answer

Kopper-Totzek process

Answer

None of these

Question 5

Width of the coke oven towards coke side is slightly more than that on pusher side to

Accepted Answer

Facilitate easy discharging of coke as it swells during carbonisation

Answer

Facilitate uniform heating of the oven

Answer

Increase the output of the coke

Answer

None of these

Question 6

Naphthalene recovered from coke oven gas is used

Accepted Answer

As moth balls (insecticides)

Answer

As moisture proof coating on fibres

Answer

As a fuel in furnaces

Answer

For making electrodes

Question 7

One kg of carbon for theoretically complete combustion requires __________ kg of air.

Accepted Answer

11.5

Answer

0.5

Answer

23

Answer

12

Question 8

Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.

Accepted Answer

All of the above

Answer

1 kg mole

Answer

22.4 Nm3

Answer

32 kg

Question 9

Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is

Accepted Answer

CH4

Answer

H2

Answer

CO2

Answer

N2