Related Questions

Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure.
A 18
B 16
C 14
D 12
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
Deficiency of combustion air during combustion of a gaseous fuel
A Lengthens the flame
B Causes heat loss of fuel by its partial combustion
C Both A & B
D Shortens the flame
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?
A Calorific value of the fuel
B Flame temperature achieved
C Speed of combustion of fuel
D Heat transfer rate to the stock in the furnace
The most commonly used combustion system manufactured in India for the thermal power plant boilers is the __________ combustion system.
A Pulverised fuel
B Travelling grate stoker firing
C Circulating fluidised bed
D Fluidised bed
The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of
A 75%
B 85%
C 90%
D 99%
In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as
A Scavenging
B Detonation
C Supercharging
D Polymerisation
The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is
A More
B Less
C Same
D May be more or less depending on engine capacity
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

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