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# GATE 2015 : Aerospace Engineering

29 pages, 55 questions, 13 questions with responses, 14 total responses
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GATE 2015 AEROSPACE AE Q. 1 Q. 25 carry one mark each. Q.1 u2 2 u The partial differential equation + = 0 is t x (A) linear and first order (C) non-linear and first order Q.2 (B) linear and second order (D) non-linear and second order a x+b y =e The system of equations for the variables x and y c x+d y= f has a unique solution only if (A) a d b c 0 Q.3 (B) a c b d 0 A linear mass-spring-dashpot system is over-damped. In free vibration, this system undergoes (A) non-oscillatory motion (C) oscillatory and periodic motion Q.4 (D) a c b d (C) a + c b + d (B) random motion (D) oscillatory and non-periodic motion A cantilever with thin-walled channel cross section is subjected to a lateral force at its shear center. The cantilever undergoes (A) bending without twisting (C) neither bending nor twisting (B) bending and twisting (D) twisting without bending = 25 Q.5 The two non-zero principal stresses at a point in a thin plate are . The maximum shear stress (in ) at this point is _____. 2 = 25 Q.6 Consider the density and altitude at the base of an isothermal layer in the standard atmosphere to be 1 and 1 , respectively. The density variation with altitude ( versus h) in that layer is governed by ( : specific gas constant, : temperature, : acceleration due to gravity at sea level) = (A) ( 1) ( 1) = (D) 1 Q.7 ( 1 ) ( 1 and ) 1 = (C) = (B) 1 1 1 For constant free stream velocity and density, a change in lift for a large aspect ratio straight wing, with thin cambered airfoil section at small angles of attack, leads to (A) a shift of the aerodynamic center and no shift of the center of pressure (B) a shift of the center of pressure and no shift of the aerodynamic center (C) shift of both the aerodynamic center and the center of pressure (D) no shift either of the aerodynamic center or of the center of pressure Q.8 Which one of the following modes of a stable aircraft has non-oscillatory response characteristics? (A) Short period (C) Dutch roll Q.9 As a candidate for a vertical tail, which one of the following airfoil sections is appropriate? (A) NACA 0012 AE (B) Phugoid (D) Spiral (B) NACA 2312 (C) NACA 23012 (D) Clarke Y profile 1/8

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