Fuels and Combustion MCQs

Question 1

Pure carbon is completely burnt in oxygen. The flue gas analysis is 70% CO2, 20% CO and 10% O2. The percent excess oxygen used is

Accepted Answer

0

Answer

20

Answer

12.5

Answer

10

Question 2

Which of the following is not a product of tar distillation?

Accepted Answer

None of these

Answer

Phenol & naphthalene

Answer

Benzol & pitch

Answer

Anthracene & creosote

Question 3

Steam is intermittently admitted into the fuel bed during the production of producer gas to

Accepted Answer

Minimise the chances of clinker formation

Answer

Convert CO to CO2

Answer

Increase the combustion rate

Answer

Increase the gas production rate

Question 4

High rate of heating of coke ovens

Accepted Answer

May damage its walls due to abrupt excessive swelling of coal

Answer

Produces larger size coke

Answer

Increases the time of carbonisation

Answer

None of these

Question 5

By-products are __________ recovered in 'Beehive ovens'.

Accepted Answer

Not at all

Answer

Fully

Answer

Partially

Answer

Negligibly

Question 6

Naphthalene is removed from coke oven gas by

Accepted Answer

Scrubbing with wash oil (a petroleum product)

Answer

Adsorbing on bog iron bed

Answer

Absorbing in vetro-coke solution

Answer

None of these

Question 7

__________ of the coal is the basis for Seylor's coal classification.

Accepted Answer

Ultimate analysis

Answer

Proximate analysis

Answer

Caking index

Answer

Calorific value

Question 8

Low temperature oxidation of coal during storage does not decrease its

Accepted Answer

None of these

Answer

Oxygen content

Answer

Caking power

Answer

Calorific value

Question 9

Pick out the wrong statement.

Accepted Answer

Ash is normally removed as

Answer

Percentage of ash in coke produced from medium coking coal is more than that in coal

Answer

The calorific value (kcal/Nm3) of coke oven gas reduces on removal of hydrogen from it by cryogenic method

Answer

Coal based fertiliser plants in India at Talcher (Orissa) and Ramagundam (A.P.) employ Kopper-Totzek process of coal gasification