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Engineering :: Fuels and Combustion


21.  Methane is flammable in concentrations from
A. 4.1 to 74.2 % B. 5.3 to 14.0 %
C. 3.2 to 12.5 % D. 1.6 to 8.5 %

22.  What is the explosive range for ethane?
A. 1.8 to 9.5 % B. 4.1 to74.2 %
C. 3.2 to 12.5 % D. 1.6 to 8.5 %

23.  Propane is flammable in concentrations from
A. 4.1 to 74.2 % B. 2.1 to 9.4 %
C. 3.2 to 12.5 % D. 5.3 to 14.0 %

24.  Butane is flammable in concentrations from
A. 4.1 to 74.2 % B. 5.3 to 14.0 %
C. 1.6 to 8.5 % D. 3.2 to 12.5 %

25.  The hottest part of flame lies in its
A. blue zone B. luminous zone
C. non-luminous zone D. zone of unburnt gases

26.  If the concentration of ethane were only 1.6% (half the lower limit of flammability) the M-S-A Explosivemeter would read
A. 100% B. 50%
C. 1.60% D. 16%

27.  If the cocentration of ethane were 3.2% (lower limit of flammability)M-S-A Explosivemeter would read
A. 100% B. 50%
C. 3.20% D. 32%

28.  A reading of 100% on the explosivementer would mean that the concentration of the combustible gas was 100% of the lowerlimit that is the concentration would be
A. 1/4 the amount necessary to cause an explosion B. 1/2 the amount necessary to cause an explosion
C. 1/10 the amount necessary to cause an explosion D. sufficient to cause an explosion

29.  Explsion will not occur if the nethane concentration in air were
A. 13% B. above 14%
C. 10% D. 6%

30.  If the explosivementer reading is zero it means that
A. there is just enough combustible gas in the air to cause an explosion B. there is too little gas in the air to cause an explosion
C. the concentration of combustible gas lies between lower and upper limits of explosibility D. the concentration of oxygen is zero




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