Engineering Software

Engineering Software is pleased to announce the introduction of free short energy conversion quizzes. 

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Here is a free short energy conversion quiz for the month of November -- when you are ready, take the free short energy conversion quiz for the month of November:

What is the gas, methane (CH4),  higher heating value?
     a) The gas, methane (CH4), higher heating value is approximately 60,000 [Btu/lbm].
     b) The gas, methane( CH4), higher heating value is approximately 12,000 [Btu/lbm].
     c) The gas, methane (CH4), higher heating value is approximately 21,500 [Btu/lbm].
     d) The gas, methane (CH4), higher heating value is approximately 4,000 [Btu/lbm].
When the gas, methane (CH4), reacts with standard air, what is the stoichiometric oxidant to fuel ratio value?
     a) The gas, methane (CH4), stoichiometric oxidant to fuel ratio value is:  10.487 [/].
     b) The gas, methane (CH4), stoichiometric oxidant to fuel ratio value is:  4.292 [/].
     c) The gas, methane (CH4), stoichiometric oxidant to fuel ratio value is:  11.444 [/].  
     d) The gas, methane (CH4), stoichiometric oxidant to fuel ratio value is:  17.167 [/].
When the gas, methane (CH4), reacts with standard air, what is the combustion products flame temperature?
     a) The combustion products flame temperature is:  1,972 [K].
     b) The combustion products flame temperature is:  2,525 [K]. 
     c) The combustion products flame temperature is:  2,460 [K].
     d) The combustion products flame temperature is:  2,327 [K].
What is the air enthaply at standard reference conditions where the temperature is 298 [K] and the pressure is 1 [atm]?
     a) The air enthalpy is:  10,000 [kJ/kg*K].
     b) The air enthalpy is:  -10,000 [kJ/kg*K].
     c) The air enthalpy is:  -20,000 [kJ/kg*K].
     d) The air enthalpy is:  0 [kJ/kg*K].
What is the molecular weight value for carbon dioxide?
     a) The carbon dioxide molecular weight value is:  32 [kg/kmol].
     b) The carbon dioxide molecular weight value is:  12 [kg/kmol].
     c) The carbon dioxide molecular weight value is:  28 [kg/kmol].
     d) The carbon dioxide molecular weight value is:  44 [kg/kmol].

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Please note that early next month, December, Engineering Software will post the correct answers to the above free short energy conversion quiz questions for the month of November! 

 

For the month of October, free short energy conversion quiz correct answers are as follows:
How does an increase in the oxidant preheat temperature impact the combustion products flame temperature when combustion takes place at stoichiometric conditions with standard air as the oxidant?
     The combustion products flame temperature increases accordingly.
How does an increase of oxygen in the oxidant impact the stoichiometric oxidant to fuel ratio?
     The stoichiometric oxidant to fuel ratio increases accordingly.
When carbon reacts with standard air at stoichiometric condition -- ideal and complete combustion, what species are present in the combustion products?
     Combustion products contain the following species:  carbon dioxide and nitrogen.
How does an increase in the nozzle outlet Mach Number impact the expansion temperature and pressure ratios?
     Both temperature and pressure ratios increase accordingly.
For a given expansion pressure ratio, how does an increase in the working fluid mass flow rate impact the thrust?
     The thrust increases accordingly.