AERODYNAMICSEXAM#8：空气动力学的考试#.doc

AERODYNAMICS EXAM #8Basic Properties of Physics1) What forces act on an aircraft in flight?a) Lift and thrustb) Lift and dragc) Lift, drag, weightd) Lift, weight, thrust, drag2) What is the definition of power?a) The ability to do workb) Work done per unit of timec) Energy due to motiond) Mass times acceleration3) What force relationship must exist for an aircraft to maintain equilibrium flight?a) Lift must equal weightb) The sum of all forces and moments acting about the center of gravity (CG) must equal zeroc) Thrust must equal weightd) Thrust must equal drag4) What is the value of atmospheric pressure on a standard day?a) 2116 lbs/ftb) 29.92 Hgc) 32.17 ft/secd) 2116 ft/lbs5) What affect does an increase in altitude have on temperature?a) Decreases until 25K and then remains constantb) Decreases until there are no molecules of airc) Decreases until 36K and then remains constantd) Decreases until 0 degrees is reached6) If you are in equilibrium flight, then you are in trimmed flight.a) Trueb) False7) Air viscosity increases as temperature:a) Increasesb) Decreasesc) Remains constant8) High density altitude will:a) Decrease the power produced by an engine and increase the thrust produced by the propeller or jetb) Increase the power produced by an engine and increase the thrust produced by the propeller or jetc) Decrease the power produced by an engine and decrease the thrust produced by the propeller or jetd) Increase the power produced by an engine and decrease the thrust produced by the propeller or jetAirplane Terminology9) What are the five major components of an airplane?a) Wings, fuselage, engine, empennage, landing gearb) Wings, cockpit, empennage, flaps, enginec) Fuselage, rudder, empennage, ailerons, engined) Fuselage, empennage, engine, vertical stabilizer, rudder10) All motion or changes in aircraftattitude occurs about which position?a) Aerodynamic center (AC)b) Center of pressure (CP)c) Center of gravity (CG)d) The cockpit11) The fuselage construction of the T-34 is:a) Full cantileverb) Full monocoquec) Semi-monocoqued) Paper mache12) The T-34 uses a dihedral wing to improve:a) Visibilityb) Maneuverabilityc) Appearanced) Lateral stability13) The wings of the T-34 are tapered:a) On the leading edgeb) On the trailing edgec) At the rootd) Both a and b14) What control surfaces control roll?a) Elevatorsb) Rudderc) Control stickd) Ailerons15) The apparent surface area of a wing from wing tip to wing tip is the:a) Taperb) Aspect rationc) Wing aread) Sweep angle16) There is an inverse relationship aspect ration and wing area.a) Trueb) FalseBasic Aerodynamic Principles17) An aircraft is stabilized in level flight at six nautical miles per second ground speed with a tailwind of 100 knots. What is the aircrafts true airspeed?a) 460 knotsb) 360 knotsc) 260 knotsd) 160 knots18) For a given altitude, what are the properties of the input provided by the static pressure port in the pitot-static system?a) The static pressure value will vary with changes in aircraft true airspeed (TAS)b) The static pressure value will vary with changes in aircraft angle of attack (AOA)c) The static pressure value will vary with changes in aircraft weightd) The static pressure value will vary with changes in atmospheric abient static pressure and altitude19) When will the value on the aircraft indicated airspeed (IAS) indicator equal the aircraft true airspeed (TAS)?a) When static pressure at aircraft altitude is less than static pressure at sea level, on a standard dayb) When static pressure at aircraft altitude is greater than static pressure at sea level, on a standard dayc) When static pressure at aircraft altitude equals static pressure at sea level, on a standard dayd) When static pressure at aircraft altitude equals density at sea level, on a standard day20) An aircraft is climbing at a constant 350 KIAS. What change occurs in Mach number as altitude increases?a) Mach number increasesb) Mach number decreasesc) Mach number remains constantd) There is no Mach number at this speed21) Two identical aircraft are stabilized in level flight. Aircraft 1 is maintaining Mach 2 at 40,000 feet. Aircraft 2 is maintaining Mach 2 at sea level. What can be said about their respective indicated and true airspeeds?a) Both aircraft are maintaining the same indicated airspeed (IAS)b) Both aircraft are maintaining the same true airspeed (TAS)c) The aircraft flying at sea level is maintaining a greater IAS and TAS than the aircraft at 40,000 feetd) The aircraft flying at 40,000 feet is maintaining a greater IAS and TAS than the aircraft at sea level22) What will the result of an increase in the dynamic pressure within a closed system, according to Bernoullis equation?a) A decrease in static pressureb) An increase in total pressurec) An increase in potential energy per unit volumed) A decrease in total energy per unit volume23) What type of correction must you apply to indicated airspeed (IAS) to calculate true airspeed (TAS)?a) Temperature correctionb) Density correctionc) Pressure correctiond) Viscosity correction24) For steady airflow:a) Static pressure, density, temperature, and velocity must increaseb) Static pressure, density, temperature, and velocity must remain constantc) Static pressure, density, temperature, and velocity must decreaseLift and Stalls25) What is the static pressure distribution about a positively cambered airfoil at zero angle of attack in level flight?a) The static pressure distribution is equal over all portions of the airfoilb) The static pressure distribution is less over the upper surface of the airfoilc) The static pressure distribution is less over the lower surface of the airfoil26) What airfoil angle of attack setting is required to produce zero net lift on a positively cambered airfoil?a) Positiveb) Negativec) Zero angle of attack27) What aerodynamic force component is always perpendicular to the relative wind?a) Weightb) Liftc) Thrustd) Drag28) What must a pilot do to accelerate an aircraft, yet maintain a constant altitude?a) Add thrust and decrease lift as true airspeed increasesb) Add thrust and increase angle of attack as true airspeed increasesc) Add thrust and decrease angle of attack as true airspeed increasesd) Reduce thrust and increase angle of attack as true airspeed increases29) How do you compute the Aerodynamic Surface Area (Wing Surface Area)?a) Divide the wingspan by average chordb) Multiply wingspan by average chordc) Square the average chordd) Square the wingspan30) What causes a stall?a) An increase in lift caused by an increase in AOAb) A decrease in lift caused by an increase in AOAc) Excessive AOAd) Both b and c31) Which of the following are BLC devices?a) Fixed slots and regulated slotsb) Fixed slots and automatic slotsc) Broken slo