1 2 Which of the following assumptions is made in a Cold Air

1.

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Which of the following assumptions is made in a Cold Air Standard Analysis, but not in an Air Standard Analysis? Combustion is modeled as heat transfer from the environment. The cycle is a closed system. The working fluid is air, which can be modeled as an ideal gas. Specific heat is constant with respect to temperature. The cutoff ratio is appropriate to use when analyzing which cycle? Otto Brayton Diesel Rankine None of the answers

Solution

Solution :

1.

The correct OPTIOn is Specific heat is constant with respect to temperature.

For cold air standard cycle the specific heats are taken at 25 degree celcius and they are assumed to be constant through out. The other assumptions are for air standard analysis.

2. The correct option is Diesel cycle.

Cut off ratio is the ratio of combustion chamber volume at the end of fuel injection and combustion chamber volume at the beginning of fuel injection.