Discussion
Consider the following statements about engine pressure ratio:
1. It is the ratio of turbine discharge to compressor inlet pressure.
2. It is used as a thrust setting parameter because thrust cannot be measured directly.
3. It is unaffected by icing of the pressure probes.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
The first two are correct. Engine pressure ratio is turbine discharge over compressor inlet pressure, and it is used to set thrust because thrust itself cannot be measured in flight.
The third is false, and dangerously so. Both pressure probes are exposed to the airstream and both can ice; a blocked probe corrupts the ratio without any flag, so the instrument reads the target value while the engine produces something else. Probe heating exists for that reason, and the setting is cross-checked against rotor speed, fuel flow and exhaust temperature.
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