GATE AE 2020 Paper 1 — page 17

Questions 49–51 of 65. Imported answers require review unless explicitly marked reviewed.

An oblique shock is inclined at an angle of 35 degrees to the upstream flow of velocity 517.56 m/s. The deflection of the flow due to this shock is 5.75 degrees and the temperature downstream is 182.46 K. Assume the gas constant

J/(kg K), specific heat ratio

, and specific heat at constant pressure

J/(kg K). Using conservation relations, the Mach number of the upstream flow can be obtained as ______ (round off to one decimal place).

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The thickness of a laminar boundary layer (

) over a flat plate is

, where

is measured from the leading edge along the length of the plate. The velocity profile within the boundary layer is idealized as varying linearly with

. For freestream velocity of 3 m/s and kinematic viscosity of

m²/s, the displacement thickness at 0.5 m from the leading edge is ______ mm (round off to two decimal places).

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A wing of 15 m span with elliptic lift distribution is generating a lift of 80 kN at a speed of 90 m/s. The density of surrounding air is 1.2 kg/m³. The induced angle of attack at this condition is ______ degrees (round off to two decimal places).

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2020 · Paper 1

Question 39

Question 40

Question 41