A. all the fuel burns instantaneously producing high energy release
B. fuel burns with less air
C. coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
D. explosion in furnace
E. none of the above
Related Mcqs:
- For combustion of a fuel, following is essential_____________________?
A. correct fuel air ratio
B. proper ignition temperature
C. 02 to support combustion
D. all the three above
E. none of the above - Incomplete combustion can be best judged by__________________?
A. smoky chimney exit
B. excess air in flue gases
C. measuring carbon mono-oxide in flue gases
D. measuring temperature of flue gases at exit of furnace
E. measuring oxygen in flue gases - The three “Ts” for good combustion are____________________?
A. temperature, time, and turbulance
B. total air, true fuel, and turbulance
C. thorough mixing, total air, and temperature
D. total air, time, and temperature
E. none of the above - Overfire burning is the phenomenon of _____________________?
A. supply of excess, air
B. supply of excess coal
C. burning CO and unburnts in upper zone of furnace by supplying more air
D. fuel bed firing
E. none of the above - In open combustion chamber in diesel engines____________________?
A. the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture
B. fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat
C. only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge
D. fuel is injected at atmospheric pres¬sure
E. there are no valves. - The basic requirement of a good combustion chamber is___________________?
A. high compression ratio
B. low compression ratio
C. low volumetric efficiency
D. minimum turbulence
E. high power output and high thermal efficiency - Stress relaxation is- the phenomenon ___________________?
A. in which parts are not loaded
B. in which stress remains constant on in-creasing load
C. in which deformation tends to loosen the joint and produces a stress reduced
D. stress reduces on increasing load
E. none of the above - Weld decay is the phenomenon found with _________________?
A. cast iron
B. mild steel
C. non-ferrous materials
D. wrought iron
E. stainless steel - The state of vapour under saturation condition is described by_______________?
A. pressure alone
B. temperature alone
C. pressure and temperature
D. pressure and dryness fraction
E. dryness fraction alone - Pick up the correct statement as regards Cornish boiler and Lancashire boiler _______________?
A. cornish is fire tube and lancashire is water tube
B. cornish is water tube and lancashire is fire tube
C. cornish has two fire tubes and lancashire has one
D. lancashire has two fire tubes and cornish has one
E. both have two fire tubes
