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Correct Answer : conceptual sketch
Explanation : Based on the general requirements, design engineer makes rough calculations of different parameters during the stage of conceptual design. Based on the initial estimation of weight and performance, engineers will draw a rough sketch having all the required details. Such rough drawing is called conceptual sketch.
Correct Answer : Option (C) : planning
Explanation : First order sizing is nothing but a three vie drawing base on initial estimated data. The three vie drawing can highlight vital information such as undercarriage location etc.
Correct Answer : Option (A) : To provide data for initial layout
Explanation : During the conceptual stage we make a rough sketch called a conceptual sketch. With the help of it we can provide initial estimation of some parameters such as aerodynamics, weight etc. This initial estimation will provide data for the initial layout. Thus, it is called as first order sizing.
Correct Answer : Option (D) : sizing
Explanation : Sizing is the process to calculate some performance parameters of aircraft. Lofting is modelling of skin. Drafting and drawing are linked together.
