COMBUSTION AND FLAME-1 KVFW VIIIA

Ignition temperature of a fuel in air is __________ that in pure oxygen.

• (A) More than
• (B) Less than
• (C) Equal to
• (D) Either more or less; depends on the type of fuel

Which of the following fuel gases has the highest calorific value?

• (A) Natural gas
• (B) Coal bed methane (CBM)
• (C) Liquefied petroleum gas (LPG)
• (D) Sewage gas

Which of the following is not a by-product fuel?

• (A) Producer gas
• (B) Blast furnace gas
• (C) Coke oven gas
• (D) Refinery gas

A sooty flame can be made non-luminous by

• (A) Admitting more gas
• (B) Shutting gas supply
• (C) Admitting more air
• (D) Shutting air supply

The gas which contributes maximum to the heating value of natural gas is

• CO
• CO2
• H2
• CH4

Nitrogen in coal

• (A) Is present upto 1-2%
• (B) Comes from protein in parent vegetable matter
• (C) Is recovered as ammonia during its carbonization
• (D) All (a), (b) and (c

Which of the following is the maximum coal producing state in India?

• ORISSA
• WEST BENGAL
• JHARKHAND
• ASSAM

Bunsen burner is an example of a/an __________ burner.

• (A) Inside mixing/premix type
• (B) Outside mixing/diffusion flame/nozzle mix type
• (C) Rotary cup
• (D) Submerged combustion

Combustion reaction of fuels is a/an __________ reaction.

• AUTOCATALYTIC
• EXOTHERMIC
• ENDOTHERMIC
• NONE OF THESE

Incomplete combustion of fuel in a furnace is judged by high _____ of the flue gases.

• CO CONTENT
• DEW POINT
• CO2 CONTENT
• O2 CONTENT