An aircraft is flying at cruise level with a velocity of 110m/s at an altitude of 10 km and the dynamic pressure is 5.43kN/m^2. Now assume the aircraft is flying is at sea level with a speed of 65m/s and the same dynamic pressure. In the above data, the velocity 65m/s refers to __________(a) true air speed(b) equivalent airspeed(c) free stream velocity(d) cruising speedI had been asked this question in an online interview.Query is from Pitot Tube in portion Inviscid & Incompressible Flow of Aerodynamics

An aircraft is flying at cruise level with a velocity of 110m/s at an

1.	An aircraft is flying at cruise level with a velocity of 110m/s at an altitude of 10 km and the dynamic pressure is 5.43kN/m^2. Now assume the aircraft is flying is at sea level with a speed of 65m/s and the same dynamic pressure. In the above data, the velocity 65m/s refers to __________(a) true air speed(b) equivalent airspeed(c) free stream velocity(d) cruising speedI had been asked this question in an online interview.Query is from Pitot Tube in portion Inviscid & Incompressible Flow of Aerodynamics
Answer» Right option is (b) EQUIVALENT airspeed Explanation: Equivalent airspeed refers to the speed of an AIRCRAFT at which it should fly so as to maintain the same DYNAMIC pressure. In the above EXAMPLE, 65m/s is the equivalent airspeed at an ALTITUDE of 10km flying with a true airspeed of 110 m/s.

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