At exhaust of nozzle temperature is 200k and density of the flow is 1.01 kg/m^3. If back pressure is 1 bar then, nozzle is ______________(a) nozzle can be under or over expanded(b) under expansion(c) over expanded(d) design conditionI got this question in a job interview.My question is based upon Propulsion in portion Propulsion and Fuel System Integration of Aircraft Design

At exhaust of nozzle temperature is 200k and density of the flow is 1.

1.	At exhaust of nozzle temperature is 200k and density of the flow is 1.01 kg/m^3. If back pressure is 1 bar then, nozzle is ______________(a) nozzle can be under or over expanded(b) under expansion(c) over expanded(d) design conditionI got this question in a job interview.My question is based upon Propulsion in portion Propulsion and Fuel System Integration of Aircraft Design
Answer» Right choice is (c) over EXPANDED The best I can explain: Given, temperature t 200k, DENSITY d 1.01 kg/m^3 Now, EXIT PRESSURE p = dRT = 2002871.01 = 57974 = 0.57 bar < 1 bar Since exit pressure p < back pressure, the nozzle is over expanded.

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