Danh sách câu hỏi

Câu 1: How many degrees to the flight path of Lift force?

a) 90 degrees
b) 70 degrees
c) 50 degrees

Câu 2: Directional stability is about?

a) The lateral axis.
b) The longitudinal axis.
c) The vertical axis.

Câu 3: The gust moves the right wing upward and the left wing downward and the aircraft rotates around?

a) The lateral axis.
b) The longitudinal axis.
c) The vertical axis.

Câu 4: The maximum camber and the location or the maximum camber help to?

a) Define the lift.
b) Define the drag.
c) Define the shape of the mean camber line.

Câu 5: When does an equilibrium exist?

a) The aircraft is in descent flight.
b) The aircraft is in climb flight.
c) The aircraft is in steady, level flight.

Câu 6: What does Longitudinal stability refer to?

a) The pitch movement around the lateral axis.
b) The roll movement around the longitudinal axis.
c) The yaw movement around the vertical axis.

Câu 7: The fundamental units used in aerodynamics are?

a) Mass, length and Velocity.
b) Mass, length, time, pressure and temperature.
c) Mass, length, time and temperature.

Câu 8: Which of the following is true?

a) Lift acts at right angles to the relative airflow and weight acts vertically down.
b) Lift acts at right angles to the wing chord line and weight acts vertically down.
c) Lift acts at right angles to the relative air flow and weight acts at right angles to the aircraft centre line.

Câu 9: When we have a flow separation at the root of the wing, the center of lift?

a) Moves towards the root and also behind the center of gravity.
b) Moves towards the tip and also behind the center of gravity.
c) Moves towards the tip and also before the center of gravity.

Câu 10: In the subsonic region, the speed is?

a) Constant.
b) So slow that a flying body does not compress the air.
c) So high that a flying body does not compress the air.

Câu 11: Acceleration is?

a) The change in speed divided by the time during which the change takes place.
b) The distance that a moving object covers in a unit of time.
c) Denoted by v, which comes from the Latin word velocitas.

Câu 12: The dutch roll problem is found on all aircraft with?

a) Tapered wings.
b) Rectangular.
c) Swept wings.

Câu 13: When a gust hits the upper front part of the aircraft, what do we get?

a) We get a nose up rotation.
b) We get a nose down rotation.
c) We get no rotation of nose.

Câu 14: How many type of stability?

a) 1
b) 2
c) 3

Câu 15: How many fundamental units in physics?

a) 5
b) 6
c) 7

Câu 16: What does The longitudinal stability depend on?

a) The angle of incidence and the pitching moment effects of the horizontal stabilizer and the wing.
b) The angle of attack and the pitching moment effects of the horizontal stabilizer and the wing.
c) The angle of attack and the pitching moment effects of the vertical stabilizer and the wing.

Câu 17: What does Lateral stability refer to?

a) The roll movement around the longitudinal axis.
b) The yaw movement around the vertical axis.
c) The pitch movement around the lateral axis.

Câu 18: With increasing altitude at altitude from 3 to 8 km, pressure decreases and?

a) Temperature increases.
b) Temperature decreases.
c) Temperature remains constant.

Câu 19: The continuity equation states that the speed of the airflow is?

a) Inversely proportional to the area of the cross section of the tube as long as the density remains constant.
b) Proportional to the area of the cross section of the tube as long as the density remains constant.
c) Inversely proportional to the area of the cross section of the tube as long as the density changes.

Câu 20: If the wing span is infinite the circulation around the profile causes?

a) An downwash on the leading edge and a downwash on the trailing edge.
b) An upwash on the leading edge and an upwash on the trailing edge.
c) An upwash on the leading edge and a downwash on the trailing edge.

Câu 21: A Lift is?

a) Perpendicular to the chord line.
b) Perpendicular to aircraft axis.
c) Perpendicular to the relative wind.

Câu 22: The aspect ratio is?

a) The wing span, b, divided by the average chord, c.
b) The wing span, b, divided by the lift.
c) The wing span, b, divided by the drag.

Câu 23: The Aircraft Fin gives stability about which axis?

a) Longitudinal axis.
b) Lateral axis.
c) Vertical axis.

Câu 24: The aerodynamic force has?

a) Two components
b) Three components
c) Four components

Câu 25: Upper surface frost and especially leading edge ice formation reduce?

a) The maximum coefficient of drag and the maximum angle of attack.
b) The maximum coefficient of lift and the maximum angle of incidence.
c) The maximum coefficient of lift and the maximum angle of attack.

Câu 26: When Moments = Zero?

a) Anti-clockwise Rotation > Clockwise Rotation
b) Anti-clockwise Rotation< Clockwise Rotation
c) Anti-clockwise Rotation = Clockwise Rotation

Câu 27: The angle of attack is?

a) The angle between the chord line of the profile and the longitudinal axis of the aircraft.
b) The angle the underside of the mainplane or tailplane makes with the horizontal.
c) The angle between the chord line of the profile and the relative wind.

Câu 28: When the position of the center of lift moves forward of the position of the center of gravity we have?

a) A nose up reaction.
b) A down up reaction.
c) No nose up or down reaction.

Câu 29: The coefficient of lift is the measured lift divided by?

a) Theoretical drag.
b) Theoretical lift.
c) Theoretical push.

Câu 30: A standard atmosphere was introduced by?

a) ICAO
b) CAAV
c) Vietnam Airlines

Câu 31: If the aircraft is to maintain altitude during a turn, the lift in the turn?

a) Must not be equal to the resultant of the centrifugal force and the weight.
b) Must be equal to the resultant of the centrifugal force and the weight.
c) Must be equal to the resultant of the centrifugal force or the weight.

Câu 32: What happens when the aircraft is in cruise flight?

a) The coefficient of lift is much less than the maximum coefficient of lift.
b) The coefficient of lift is equal the maximum coefficient of lift.
c) The coefficient of lift is minimum.

Câu 33: Different wing shapes are?

a) An elliptical wing, a rectangular wing, a tapered wing, a swept wing
b) An elliptical wing, a rectangular wing.
c) An elliptical wing, a swept wing

Câu 34: What is Drag?

a) The aerodynamic force which is parallel to the flight path.
b) The force which moves the aircraft forward through the air.
c) Provided by jet engines or by a propeller.

Câu 35: What is the sideslip angle?

a) The angle between the aircraft centerline and the sideslip direction.
b) The angle between the aircraft centerline and the wing axis.
c) The angle between the aircraft centerline and the fuselage axis.

Câu 36: Temperature at altitude above 11km will?

a) Increase exponentially.
b) Decrease exponentially.
c) Remain constant.

Câu 37: The speed of sound is less at high altitudes because the temperature?

a) Is constant.
b) Is higher.
c) Is lower.

Câu 38: When do dynamic stability apply?

a) Dynamic stability only applies if we have neutral static stability.
b) Dynamic stability only applies if we have positive static stability.
c) Dynamic stability only applies if we have negative static stability.

Câu 39: The load factor ”n” is also called?

a) G−load
b) W-load
c) V−load

Câu 40: When does the angle of incidence change?

a) It never changes.
b) When the aircraft attitude changes.
c) When the aircraft is ascending or descending.

Câu 41: When the cylinder rotates the circulatory flow causes?

a) An decrease in local speed on the upper surface of the cylinder and a decrease in local speed on the lower surface.
b) An increase in local speed on the upper surface of the cylinder and a decrease in local speed on the lower surface.
c) An increase in local speed on the lower surface of the cylinder and a decrease in local speed on the lower surface.

Câu 42: The turbulent boundary layer also produces?

a) Lower kinetic energy next to the surface and this reduces the tendency for a flow separation.
b) Higher kinetic energy next to the surface and this reduces the tendency for a flow separation.
c) Higher kinetic energy next to the surface and this increase the tendency for a flow separation.

Câu 43: The nose up rotation also produces additional lift on the wing because of?

a) The decreasing angle of incidence.
b) The decreasing angle of attack.
c) The increasing angle of attack.

Câu 44: The chord line of a wing is a line that runs from?

a) The centre of the leading edge of the wing to the trailing edge.
b) Half way between the upper and lower surface of the wing.
c) One wing tip to the other wing tip.

Câu 45: What is Weight?

a) The force of thrust.
b) The force of pressure.
c) The force of gravity.

Câu 46: For a given aerofoil production lift, where P = pressure and V = velocity.

a) P1 is greater than P2, and V1 is less than V2.
b) P1 is greater than P2, and V1 is greater than V2.
c) P1 is less than P2 and V1 is greater than V2.

Câu 47: On a geometrically twisted wing the camber of the profile is?

a) Smaller than the camber at the tip and the angle of incidence is constant across the wing span.
b) Greater than the camber at the tip and the angle of incidence is increased across the wing span.
c) Constant across the span of the wing but the angle of incidence is greater at the root than at the tip.

Câu 48: The structural strength of the aircraft and consideration for passenger comfort limit?

a) The maximum angle of attack during a turn.
b) The maximum load factor.
c) The maximum speed during a turn.

Câu 49: What is Lift?

a) The aerodynamic force which is ninety degrees to the flight path.
b) The force which moves the aircraft forward through the air.
c) Provided by jet engines or by a propeller.

Câu 50: What is sea level pressure?

a) 1012.3 mb.
b) 1013.2 mb.
c) 1032.2 mb.

Câu 51: A profile is?

a) A cross section of a wing.
b) A cross section of a fuselage.
c) A cross section of a Tailcone.

Câu 52: When an aircraft is in constant altitude, wings level flight, the lift is?

a) Equal to the weight of the aircraft.
b) Smaller to the weight of the aircraft.
c) Bigger to the weight of the aircraft.

Câu 53: The load factor on military is much?

a) Higher than on passenger aircraft.
b) Lower than on passenger aircraft.
c) Higher than on acrobatic aircraft.

Câu 54: The relative wind depends on?

a) The flight path and is therefore not always horizontal.
b) The angle of attack and is therefore not always horizontal.
c) The angle of attack and is always horizontal.

Câu 55: What does The lift on the wing has to carry?

a) The weight of the aircraft only
b) The downward acting stabilizer force only
c) The weight of the aircraft and the downward acting stabilizer force.

Câu 56: When the aircraft is in low speed flight?

a) The coefficient of lift is at, or close to, the maximum.
b) The coefficient of lift above the maximum.
c) The coefficient of lift is higher the maximum.

Câu 57: What can The center of gravity be thought of as?

a) A center of pressure.
b) A center of balance.
c) A center of lift.

Câu 58: If an aircraft moves in yaw, what axis does it move about?

a) Longitudinal.
b) Lateral.
c) Vertical.

Câu 59: What is the definition of Angle of Incidence?

a) The angle the underside of the mainplane or tailplane makes with the horizontal.
b) The angle the underside of the mainplane or tailplane makes with the longitudinal datum line.
c) The angle between the chord line of the profile and the longitudinal axis of the aircraft.

Câu 60: A flow separation at the tip of the wing is much more dangerous. It causes?

a) The center of lift moves towards the root and also forward of the center of gravity.
b) The center of lift moves towards the tip and also forward of the center of gravity.
c) The center of lift moves towards the root and also aft of the center of gravity.

Câu 61: How many different wing shapes with their lift distribution?

a) 2
b) 3
c) 4

Câu 62: In static stability, when the ball is displaced from the center on a concave surface?

a) It returns to its original position of equilibrium.
b) It moves away from its original position of equilibrium.
c) It shows no tendency to roll back or away from its original position of equilibrium.

Câu 63: What does Directional stability refer to?

a) The yaw movement around the vertical axis.
b) The pitch movement around the lateral axis.
c) The roll movement around the longitudinal axis.

Câu 64: How do you understand about the tropopause?

a) The tropopause has different heights around the earth.
b) The tropopause has the heights less than 3 kilometers over the equator.
c) The tropopause has the same heights around the earth.

Câu 65: What is Longitudinal stability?

a) Longitudinal stability is the stability of the aircraft around the vertical axis.
b) Longitudinal stability is the stability of the aircraft around the lateral axis.
c) Longitudinal stability is the stability of the aircraft around the longitudinal axis.

Câu 66: Lateral stability is about?

a) The longitudinal axis.
b) The normal axis.
c) The vertical axis.

Câu 67: Static pressure acts?

a) Only in the direction of the flow
b) Equally in all directions
c) Only in the direction of aircraft motion.

Câu 68: On an aerodynamically twisted wing the camber of the profile at the root is?

a) Smaller than the camber at the tip and the angle of incidence is constant across the wing span.
b) Greater than the camber at the tip and the angle of incidence is increased across the wing span.
c) Greater than the camber at the tip and the angle of incidence is constant across the wing span.

Câu 69: What is Dutch roll?