Tar is a better fuel than furnace oil, because of its

Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its

A

Emissivity factor is higher

B

Sulphur content is lower

C

Flue gas has lower dew point thereby facilitating more waste heat recovery

D

All of the above

After the increase of price of oil by 40%, a family decided to reduce its oil consumption so that the expenditure for oil goes up by 26% only. If the total consumption of oil before the price rise was 10 kg per month, then what is the current consumption of oil per month (in kg)?

A

8

B

8.50

C

9

D

None of these

Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.

A

5

B

25

C

55

D

75

Coke oven gas is a better fuel than blast furnace gas, because of its higher

A

Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)

B

Adiabatic flame temperature

C

Heat release rate (thus requiring smaller combustion chamber)

D

All of the above

Which of the following is not an important property of fuel oil/furnace oil?

A

Sulphur content

B

Viscosity

C

Aniline point

D

Flash point

Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

A

Its calorific value is very less

B

Tar neutralises the residual acids present in pitch

C

It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop

D

All of the above

In a refinery petroleum crude is fractionated into gas fraction, light ends, intermediate distillates, heavy distillates, residues and by products. The group of products including gas oil, diesel oil and heavy fuel oil belongs to the fraction

A

Heavy distillates

B

Intermediate distillates

C

Light ends

D

Residues

An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace.

A

Walking beam

B

Shaft

C

Tunnel

D

Rotary hearth

Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by

A

Increasing the draft in the furnace

B

Preheating the fuel gas

C

Oxygen enrichment of combustion air

D

Preheating the combustion air

Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.

A

1800

B

2200

C

2400

D

2700

Tar is a better fuel than furnace oil, because of its

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