Which of the following is correct?(a) Variable pitch propeller is used to improve thrust characteristics(b) Variable pitch should not be used at all(c) Always use variable pitch propeller(d) Variable pitch has no disadvantageI have been asked this question by my college professor while I was bunking the class.My question is from Propulsion topic in section Propulsion and Fuel System Integration of Aircraft Design

Which of the following is correct?(a) Variable pitch propeller is used

1.	Which of the following is correct?(a) Variable pitch propeller is used to improve thrust characteristics(b) Variable pitch should not be used at all(c) Always use variable pitch propeller(d) Variable pitch has no disadvantageI have been asked this question by my college professor while I was bunking the class.My question is from Propulsion topic in section Propulsion and Fuel System Integration of Aircraft Design
Answer» The correct answer is (a) VARIABLE pitch propeller is used to improve thrust characteristics For explanation: Variable pitch propeller is used to improve thrust characteristics across broad speed range. Variable pitch can be used to ALTER accelerating force. However, variable pitch has some drawbacks as well. Hence, it should be used as per MISSION requirements.

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