Monthly Quizzes 

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

 

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

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?
      a) The combustion products flame temperature decreases accordingly.
      b) The combustion products flame temperature increases accordingly.
      c) The combustion products flame temperature first increases  and then it decreases accordingly.
      d) The combuistion produts flame temperature is not dependent of the oxidant prehaet temperature.
How does an increase of oxygen in the oxidant impact the stoichiometric oxidant to fuel ratio?
      a) The stoichiometric oxidant to fuel ratio decreases accordingly.
      b) The stoichiometric oxidant to fuel ratio increases accordingly.
      c) The stoichiometric oxidant to fuel ratio first increases and then it decreases accordingly.
      d) The stoichiometric oxidant to fuel ratio is not dependent on the oxidant composition.
When carbon reacts with standard air at stoichiometric condition -- ideal and complete combustion, what species are present in the combustion products?
      a) Combustion products contain the following species:  carbon, oxygen and nitrogen.
      b) Combustion products contain  the following species:  carbon dioxide and nitrogen.
      c) Combustion products contain the following species:  carbon monoxide, oxygen and nitrogen.  
      d) Combustion products contain the following species:  carbon dioxide, water vapor, sulfur dioxide and nitrogen.
How does an increase in the nozzle outlet Mach Number impact the expansion temperature and pressure ratios?
      a) Both temperature and pressure ratios decrease accordingly.  
      b) Both temperature and pressure ratios increase accordingly. 
      c) Both temperature and pressure ratios first increase and then they decrease accordingly. 
      d) Both temperature and pressure ratios are not dependent on the nozzle outlet Mach Number.
For a given expansion pressure ratio, how does an increase in the working fluid mass flow rate impact the thrust?
      a) The thrust decreases accordingly.
      b) The thrust increases accordingly. 
      c) The thrust first increases and then it decreases accordingly.
      d) The thrust is not dependent on the working fluid mass flow rate.

 

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

 

For the month of September, free short energy conversion quiz correct answers are as follows:

What is the oil higher heating value?
      The oil higher heating value is approximately 20,660 [Btu/lbm].
When oil reacts with standard air, what is the stoichiometric oxidant to fuel ratio value?
      Oil stoichiometric oxidant to fuel ratio value is:  14.649 [/].
When oil reacts with standard air, what is the combustion products flame temperature?
      The combustion products flame temperature is:  2,484 [K].
What is the oxygen enthaply at standard reference conditions where the temperature is 298 [K] and the pressure is 1 [atm]?
      The oxygen enthalpy is:  0 [kJ/kg*K].
Which of the following species: carbon dioxide, sulfur, sulfur dioxide, water vapor has the smallest molecular weight?
      Sulfur has the smallest molecular weight.

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Last Update:  October, 2020