Related Questions

During combustion of gaseous fuels, deficiency of air
A does not affect the flame length
B increases the flame temperature
C tends to shorten the flame
D lengthens the flame
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.
A 400-500
B 900-1000
C 1400-1500
D 1700-1800
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the
A Incomplete combustion
B Complete combustion
C High oxygen in flue gas
D None of these
Short/intense flame is produced during combustion of gaseous fuel by using
A High amount/current of combustion air
B Low amount/current of combustion air
C Preheated secondary air
D Very little excess air
For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will
A Increase
B Decrease
C Increase or decrease depending on the fuel type
D Not change
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be
A Low
B High
C Very high, if the fuel is of low calorific value
D None of these
In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous
A Uranium oxide
B Uranium hexaflouride
C Uranium carbide
D Uranium sulphate
Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about
A 9:1
B 17 : 1
C 23 : 1
D 29 : 1
Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be
A 9.5:1
B 12.5:1
C 15.5 :1
D 18.5 : 1
If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about
A 17 : 1
B 15 : 1
C 13 : 1
D 10 : 1

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