A travelling grate stoker is meant for the efficient burning of __________ coal.

Which of the following fuels is the best for burning on chain grate stoker?

A

Non-caking coal

B

Caking coal

C

Coking coal

D

Pulverised coal

The best suited coal for chain or traveling grate stoker boiler is

A

Coking coal

B

Non-coking or free burning coal

C

Pulverized coal

D

High sulphur coal

Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

A

Low reactivity of carbonised residue containing high proportion of iron & sulphur

B

Low forced draft & fuel bed temperature

C

Thick firebed and preheated primary air

D

All of the above

During combustion of coal on grate, clinker formation is increased by the

A

Use of thick fire bed

B

Low fusion point of ash (

C

Use of preheated primary air

D

All of the above

Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is

A

underfeed stoker

B

overfeed stoker

C

any

D

none of the above

Efficient burning of anthracite coal requires

A

Low preheat of air

B

Fine grinding

C

High excess air

D

All of the above

Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.

A

1000

B

4000

C

6000

D

8000

If h₁ = inner film co-efficient and /h₂ = outer film co-efficient, then the overall heat transfer co-efficient is

A

Always less than h₁

B

Always between h₁ and h₂

C

Always higher than h₂

D

Dependent on metal resistance

Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.

A

Reduce SO₂ content in

B

Catalytically convert SO₂ to SO₃ in

C

Increase the dew point of

D

None of these

Dantes heard the key grate in the lock when the

A

cell door was shut.

B

cell door was opened.

C

storeroom was opened

D

storeroom was shut.

A travelling grate stoker is meant for the efficient burning of __________ coal.

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