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

Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by

A

Preheating the combustion air

B

Oxygen enrichment of combustion air

C

Preheating the fuel gas

D

All of the above

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

Fuel economy in an industrial furnace operation can not be achieved by the use of

A

Stoichiometric combustion air

B

Non-preheated combustion air

C

Combustion air not enriched with oxygen

D

Recupterators

Which of the following is a lean fuel gas?

A

Coke oven gas

B

LPG

C

Blast furnace gas

D

Natural gas

Rahim's convertible gets gas mileage that is 40% higher than that of Karim's SUV. If Jalil's hatchback gets gas mileage that is 15% higher than of Rahim's convertible, then that of Rahim's convertible, then Jalil's hatchback gets gas mileage that is what percent greater that of Karim's SUV?

A

46%

B

55%

C

61%

D

25%

The _________ engines can work on very lean mixture of fuel.

A

Spark ignition

B

Compression ignition

C

Both (A) and (B)

D

None of these

The temperature at which a gas, when subjected to Joule-Thomson expansion, neither cools or heats up, is termed as the __________ temperature. Above this temperature the gas heats up on throttling and below this the gas cools down.

A

Isotactic

B

Saturation

C

Inversion

D

Throttling

Higher fuel combustion efficiency can not be achieved by

A

Preheating of fuel gases & combustion air

B

Reducing sulphur content in the fuel

C

Adopting proper fuel firing technique & fuel preparation

D

Supplying correct amount of combustion air

Higher efficiency in the combustion of solid fuel can not be achieved by

A

Proper fuel preparation

B

Keeping the flue gas exhaust temperature very high

C

Adopting efficient-fuel firing technique & equipment

D

Supplying correct quantity of combustion air

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

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