FUELS AND COMBUSTION QUIZ

Natural draft created by the chimney depends upon

Neither A nor B

Its height

Both A & B

Temperature of the flue gas

TRUE ANSWER : ?
YOUR ANSWER : ?

The function of secondary combustion air is to

Completely burn the volatile matter

Burn the lumpy coal

None of these

Pneumatically convey the pulverised coal

TRUE ANSWER : ?
YOUR ANSWER : ?

Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?

100

70

50

85

TRUE ANSWER : ?
YOUR ANSWER : ?

Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.

Latent

Sensible and latent

None of these

Sensible

TRUE ANSWER : ?
YOUR ANSWER : ?

Supply of excess air for complete combustion of fuel is necessitated to facilitate

Attainment of chemical equilibrium

None of these

Its thorough mixing with air

Attainment of high temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the

Complete combustion

None of these

High oxygen in flue gas

Incomplete combustion

TRUE ANSWER : ?
YOUR ANSWER : ?

The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

O₂, CO₂, CO

CO₂, CO, O₂

CO, O₂, CO₂

CO₂, O₂, CO

TRUE ANSWER : ?
YOUR ANSWER : ?

Calorific value of furnace oil is about __________ Kcal/kg.

20000

5000

10000

15000

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ process is meant for direct hydrogenation of coal to produce liquid fuel.

Bergius

Fischer-Tropsch

None of these

Lurgi

TRUE ANSWER : ?
YOUR ANSWER : ?

Coke made in narrower by-product coke ovens (as compared to wider ovens) is

Less reactive

Stronger

All of these

Smaller in size

TRUE ANSWER : ?
YOUR ANSWER : ?

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