If mf is the mass of fuel supplied per kg of air in one second, then the mass of gases leaving the nozzle of turbojet will be

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ESE Mechanical 2020 Official Paper
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  1. 1 - mf
  2. 1/(1 - mf)
  3. 1 + mf
  4. 1/(1 + mf)

Answer (Detailed Solution Below)

Option 3 : 1 + mf
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Concept:

Let ma be the mass of air into turbojet, mf be the mass of fuel supplied in one second

By mass conservation during combustion reaction, the exhaust gases will have mass ma + mf

Here,

Mass flow rate of air to the turbojet = 1 kg/sec

Mass flow rate of fuel supplied = mf kg/sec

Mass of gases leaving will be 1 + mf kg/sec

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