Related Questions

— air is composed of about 78 percent nitrogen and |. only about 21 percent oxygen, is a little known fact -_. on the streets.
A How that
B This
C When
D However
The arrangement made to support an unsafe structure temporarily, is known as
A Shoring
B Scaffolding
C Underpinning
D Jacking
Exposure to mixtures of chemicals are greater than expected on the basis of effects of exposure to each chemical individually. This is known as
A Additives
B Antagonism
C Synergism
D Independent
Presence of nitrogen in combustion air does not reduce the
A Amount of heat liberated
B Flame temperature
C Flue gas temperature
D Any of the above
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has
A High bond dissociation energy
B Smaller atomic radius
C Stable half filled 2p sub level
D High nuclear charge
Oxygen enrichment of combustion air does not result in increase of the
A Flame temperature
B Oxygen in the flue gas
C Stack loss
D Heat transfer rate in the furnace
Nitrogen content in ammonium sulphate (a fertiliser) is around __________ percent.
A 5
B 20
C 50
D 65
Nitrogen content of urea is about __________ percent.
A 10
B 46
C 80
D 94
Nitrogen content of calcium ammonium nitrate (CAN) is __________ percent.
A 10
B 25
C 50
D 80
Use of excess of combustion air in the combustion of fuels results in
A Heat losses
B Long flame
C Condensation of water vapour from the fuel gas
D None of these

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