Flight Mechanics December 31, 2018 Editor 0 Flight is the process by which an object moves through an atmosphere (or beyond it, as in the case of space flight) without contact with the surface. This can be achieved by generating aerodynamics lift associated with propulsive thrust, aeroelasticity using buoncy or by ballistics movement. Flight Mechanics is the branch of engineering that studies the motion of aerospace vehicles in flight when acted upon by gravitational, aerodynamic, propulsive, and other external forces. Which of the following statement about the effect on drag of removal og external tip tank from the wing of an aeroplane is correct?i]Parasite drag decreasesii]Induced drag increases i, ii correct i, ii incorrect i is incorrect, ii is correct i is correct, ii is incorrect A rate one 360 degree turn takes____to complete? 2 minutes 3 minutes 4 minutes 5 minutes Skidding in turn is caused by excessive? AOB Weight Load factor TAS Slipping in turn is caused by excessive? Load factor Weight AOB TAS Considering the Gust load factor, which statement is correct?i]When the mass increases, the gust load factor decreasesii]When the altituded increases, the gust load factor decreases. i is correct, ii is correct i is correct, ii is incorrect i is incorrect, ii is correct Both are incorrect If no corrective action taken in skidding in turn will? Reduce turn radius until balanced turn is established Result in low speed stall Result in high speed stall Increase turn radius until a balanced turn is achieved A balanced constant altitude turn requires? Increased AOA & Decreased power Decreased AOA & Power Increased AOA & Power Decreased AOA & Increased power Which of the following is not a way cockpit-flight crew interfaces in the FMS? Multi Function Display Primary Flight Display Keyboard and Cursor Control Unit Target Detection and Locking System Which of the following statement about the induced drag is correct?i]A induced drag decreases as the AOA decreasesii]At constant load factor, induced drag decreases with decreasing aeroplane mass i is correct, ii is correct i is incorrect, ii is correct i is correct, ii is incorrect Both are incorrect Which of the following formulae describes relation between force(F), mass(m) and acceleration(a)? m=F.a a=F.m F=m/a F=m.a The number of independent FMS in a typically commercial aircraft is? 1 2 3 5 Lift is generated when? A certain mass of air accelerated downwards A shape of the airfoil slightly cambered An airfoil is placed in a high velocity stream A certain mass of the air is retarded Certification rules require that aircraft must be equipped to provide a cabin pressure altitude of not greater than what value at maximum operating altitude of the aeroplane under normal operating conditions? 50,000 feet 35,000 feet 10,000 feet 8,000 feet What is the number of Flight Management Computers used in a typical commercial aircraft? 3 2 6 4 Considering an aeroplane entering the ground effect at constant angle of attck, which statemet is correct?i]The downwash angle increasesii]The induced angle of attack remains constant. i is correct, ii is correct is incorrect, ii is incorrect i is correct, ii is incorrect i is incorrect, ii is correct What type of cockpit flight crew interface is used to enter or modify the data on the MFD? Control stick Control Switches Control levers Keyboard and Cursor Control Unit Which one of the following is not a function of the FMS? Flight guidance and control of flight path Monitor and regulate speed of the aircraft Automatically switch between different types of communication Automatic control of engine thrust What does the following figure represent? Flight management system Flight Data System Total autopilot system Flight Management Computer The maximaum limit of the ionizing radiation exposure not exceeded in any one year 50mSv. Approximately what is the mean annual exposure of long-haul aircrew? 5-6 mSv 5 mSv less than 4mSv 10 mSv How does lift vary with lift coefficient? Constant Directly Inversely Conversely Considering an aeroplane leaving the ground effect at a constant angle, which statement is correct?i]The lift coefficient decreasesii]The induced drag coefficient ramains constant i is correct, ii is correct i is incorrect, ii is incorrect i is correct, ii is incorrect i is incorrect, ii is correct A large airline employs roughly how many staff per aircraft? 300 100 70 50 The runway layout of an airport usually designed such that crosswidn do not affect operation more than... 5% of the time 20% of the time 50% of the time 15% of the time The first airliner to cruise in the stratosphere was the De Havilland Comet Brabazon Concorde Boeing 707 Considering flutter which statement is correct?i]Wing mounted engine extending ahead of the wing contribute to wing futter suppression.ii]Excessive of free play of backlash reduces the speed at which control surface flutter occurs? i is correct, ii is correct i is incorrect, ii is correct i is correct, ii is incorrect i is incorrect, ii is incorrect Which is the absolute ceiling that can be reached by the pilot practically? Service ceiling Absolute ceiling None of above How does drag vary with ambient air density? Conversely Inversely Constant Dirently Aileron deflection is defined as positive when: the trailing edge of the aileron on the right wing rotates up the trailing edge rotates to the left the trailing edge rotates to the right None of above Which of the following statement about the strength of wingtip vortices is correct?i]Assuming no flow seperation, the strength of the wingtip vortices increases as the AOA decreasesii]The strength of the wingtip vortices decreases as the aspect ratio decreases i, ii correct i, ii incorrect i is correct, ii is incorrect i is incorrect, ii is correct One of the statistically most likely causes of deaths in General Aviation operations is in-cockpit distractions False True Considering the subsonic incompressibel airflow through a venturi, which statement is correct?i]The static pressure in the throat is higher than the undisturbed flowii]The speed in the throat is lower than the undisturbed flow? ii is correct, ii is correct i is incorrect, ii is incorrect i is incorrect, ii is correct i is correct, ii is incorrect Rudder deflection defined as positive when: tha trailing edge ratates to normal the trailing edge ratates to left the trailing edge at critial angle None of above Aerodynamic forces and moments are strongly dependent upon the ambient density of the air at flight velocity flight path critical angle of attack the altitude of flight According to the Airbus, over the last four decades airline load factor have been Indcreasing steadily Decreasing steadily Diminishing steadily Roughly constant What operating mode of the FMS does figure show? Independent mode Single mode Double mode Redundancy mode What is the METAR encoding of clouds indicating a risk of thunderstorm, with a base at 3000 feet, covering between 3/8 and 4/8 of the sky? SCT300 FEW030CB FEW300 SCR030CB The undercarriage layout featured by the Lockheed U-2 is Bicycle Tandem (bicycle) with fall-away gears under the wings Tricycle None of above Considering flutter, which statement is correct?i]If flutter occurs IAS should be reduced.ii]Resistance to flutter increases with increasing wing stiffness. i is correct, ii is incorrect i is incorrect, ii is correct Both are correct What is the METAR encoding of 50% cloud cover (cumulus) with its base at 2300 feet? FEW023 BKN023 SCT023 EFT023 Considering flutter, which statement is correct?i]Aero-elastic coupling does not affect flutter characteristicsii]Occurance of flutter of independent of IAS i is correct, ii is correct i is correct, ii is incorrect i is incorrect, ii is correct Both are incorrect A light twin is in a turn at 20 degree bank and 150 kt TAS. A more heavy aeroplane at the same bank and same speed will? Turn at a bigger turn radius Turn at a smaller turn radius Turn at a higher turn rate Turn at a same turn radius Considering the gust load factor, which statement is correct?i]When the wing area increases, the gust load factor increasesii]When the EAS increases, the gust load factor increases. i is correct, ii is incorrect i is incorrect, ii is incorrect i is correct, ii is correct i is incorrect, ii correct The turn indicator shows a right turn. The slip indicator is left of the neutral. To coordinate turn? A higher turn rate is required More right bank is required More rudder is required Less right bank is required A jet aeroplane is rolled into a turn, while maintaining airspeed and holding altitude. In such a case pilot has to? Increase thrust and angle of attack Increase thrust and keep angle of attack unchange Increase thrust and decrease angle of attack Increase angle of attack and keep thrust unchanged What controls inputs are required to maintain airspeed & altitude when turning in a jet aircraft? Increase pitch angle Increase bank angle Increase turn radius and decrease thrust Increase thrust and angle of attack Considering subsonic incompressible airflow through a venturi, which statement is correct?i]The dynamic pressure in the throat is the same as the indisturbed flow.ii]The total pressure in the throat is higher than the undisturbed flow i is correct, ii is correct i is incorrect, ii is incorrect i is correct, ii is incorrect Both are incorrect Control surface mass balance weighs are fitted? Above the hinge Behind the hinge Infront of the hinge Below the hinge The upper half of the stratosphere the ambient temperature Decreases with altitude is constant with altitude Increases with altitude None of above Considering an aeorplane leaving the ground effect at constant angle, which statement is correct?i]The downwash angle increasesii]The induced angle of attack remains constant. i is correct, ii is correct i is incorrect, ii is incorrect i is incorrect, ii is correct i is correct, ii incorrect Which of the following statement about the spin is correct? Every airplane must be designed such that it can never enter a spin An airplane is prone to spin when the stall stars at the wing root In the spin, airspeed contunuosly increases During spin recovery the aileron must be kept in the neutral position Flaperons are controls which are used to simultaneously as? Flaps & Elevator Flaps & Ailerons Ailerons & Elevator Flaps and Speed brakes Considering an aeroplane entering the ground effect at constant angle, which statement is correct?i]The lift coefficient decreasesii]The induced drag coefficient remains constant i is correct, ii is correct i is incorrect, ii is incorrect i is incorrect, ii is correct i is correct, ii is incorect When flaps are deployed at constant AOA the lift coefficient will? Decrease Vary as the square of IAS Increases Remain the same The Ideal Subsonic Airplane (ISA) describes as an airplane that has... Parabolic drag polar with constant coefficient Induced drag with constant coefficient Induced drag with variable function of aileron None of above The lowest speed at which an airplane can maintain steady level flight(constant altitude) is called as Critical flight condition Stall angle Stall speed None of above For an aircraft to be statically stable, the centre of gravity must always be Ahead of wing aerodynamic centre Aft of the wing aerodynamic centre Ahead of neutral point Aft of neutral point For a tailless aircraft, The neutral point coincides with aerodynamic centre The neutral point lies ahead of aerodynamic centre The neutral point lies behind of aerodynamic centre The neutral point varies with aerodynamics centre For an aircraft considering wing alone to be destabilizing, the centre of gravity must always be Ahead of wing aerodynamic centre Aft of wing aerodynamic centre Ahead of neutral point Aft of neutral point An aircraft in level flight encounters a vertical hust which excites the phugoid mode. The phygoid motion completes 10 cycles is 50 s and its amplitude reduces to half of its maximum value in 25 s. The Eigen value of the phygoid mode are__________ -0.05 ± 0.02 i -0.5 ± 0.2 i -0.028 ± 1.26 i 0.28 ± 1.26 i The damping of rolling motion can be improved by High wings, dihedral angles and sweep angles High wings, aileron design and sweep angles Low wings, dihedral angles and sweep angles Low wings, aileron airfoil design and sweep angles

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