InterviewSolution

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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

51.	Fuel consumption during cruise is affected by wetted area.(a) True(b) FalseThis question was addressed to me in an interview.I want to ask this question from Conceptual Sketch Sizing topic in chapter Conceptual Sketch Sizing of Aircraft Design
Answer» Correct option is (a) True The best I can explain: Fuel conception or fuel fraction during cruise SEGMENT will be affected by the overall aerodynamic efficiency. The aerodynamic efficiency is ratio of lift and drag. Lift is DIRECTLY affected by the wetted area, which affects L/D. As a result, it will AFFECT fuel fraction during cruise mission PHASE.

52.	In general, the fuel weight is represented by a fraction of total take-off weight.(a) True(b) FalseI had been asked this question during an online exam.Asked question is from Conceptual Sketch Sizing topic in division Conceptual Sketch Sizing of Aircraft Design
Answer» RIGHT option is (a) True Easy explanation: For given Aircraft, we KNOW the typical values for crew and payload. However, we do not know fuel weight as WELL as EMPTY weight. Hence, they are represented in terms of the fraction of total take-off weight. This can simplify the calculation.

53.	For a typical jet following diagram is presented. What should be the average empty weight fraction for the aircraft?(a) 0.5(b) 0.35(c) 0.425(d) 0.42The question was asked in a national level competition.I'm obligated to ask this question of Conceptual Sketch Sizing topic in division Conceptual Sketch Sizing of Aircraft Design
Answer» Right OPTION is (c) 0.425 To elaborate: Here, CHART is SHOWN for typical aircraft. From chart, the average VALUE of weight fraction = (0.5+0.45+0.4+035)/4 = 0.425

54.	Variable sweep wings have higher empty weight fraction than that of the fixed sweep wing.(a) True(b) FalseThis question was addressed to me in exam.The query is from Conceptual Sketch Sizing in division Conceptual Sketch Sizing of Aircraft Design
Answer» CORRECT CHOICE is (a) True The EXPLANATION is: Variable sweep will require more effort and structural breaks than fixed sweep. Structural break will INCREASE weight. For, variable sweep, variable sweep constant is 1.04 and for fixed sweep it is 1.0.