1.

An aircraft with crew and payload of 180kg is flying. If fuel weight fraction is 0.353 and empty weight fraction 0.481 then, what will be the gross weight of aircraft?(a) 2391kg(b) 2391lb(c) 1000kg(d) 1000lbI got this question in an interview for job.This key question is from Conceptual Sketch Sizing in portion Conceptual Sketch Sizing of Aircraft Design

Answer» CORRECT choice is (B) 2391lb

Easiest explanation: Given crew and PAYLOAD = 180kg,

Fuel weight fraction Wf / W0 = 0.353, EMPTY weight fraction We / W0 = 0.481

Gross weight of aircraft is,

W0 = Wcrew + Wpayload + WFUEL + Wempty

By re-arranging,

W0 = Wcrew + Wpayload / [1 – (Wf / W0) – (We / W0)]

= 180 / [1-0.353-0.481] = 1084.33 kg = 2390.96lb


Discussion

No Comment Found

Related InterviewSolutions