Aerodynamics and Aircraft Systems Quiz

Question 1

• Parasite drag remains the same if airspeed increases from 75 knots to 150 knots while angle of attack is held constant.
• Parasite drag will double.

Question 2

• Elevator trim tab moved up to correct nose-heavy condition.
• Elevator trim tab moved up and elevator moved down.

Question 3

• Induced drag is inversely proportional to the square of indicated airspeed (IAS).
• Induced drag is inversely proportional to the aspect ratio.
• Both are correct.

Question 4

• Dihedral is used to provide lateral stability about the longitudinal axis.

Question 5

• Swept-back and delta wings are very efficient at high speeds but inefficient at low speeds.

Question 6

• The function of a shut-off valve in a pneumatic system is to regulate the supply of bleed air.

Question 7

• Electrons have a negative charge.

Question 8

• Diffuser vanes in centrifugal compressors convert kinetic energy to pressure energy.

Question 9

• A typical APU provides air for engine starting and electrical power for ground or inflight use.

Question 10

• A hydraulic check valve restricts fluid flow in one direction.

Question 11

• Power increase with initial increase in altitude when an engine has a supercharger is due to the reduction in exhaust back pressure.

Question 12

• With increased altitude, the octane rating of fuel needs to increase to maintain the best Air/Fuel ratio.

Question 13

• Dynamic stability is reduced at high altitude due to aerodynamic damping.

Question 14

• Materials with free electrons are called conductors.

Question 15

• Materials with few free electrons are called insulators.

Question 16

• Materials with very few free electrons are called insulators.

Question 17

• Increasing the camber of an airfoil increases lift.

Question 18

• Power effect is most prominent when aircraft has high power and low speed during take-off and approach.

Question 19

• When connecting batteries in parallel, the total voltage is equal to the sum of the individual battery voltages.

Question 20

• Dry chemical fire extinguishers (purple, brown, or green) are very effective against electrical and flammable fires.
• It is the principal extinguisher for flammable liquid fires because it blankets the flame by excluding oxygen.

Question 21

• Taper ratio is the ratio of tip chord to root chord.

Question 22

• If EMF decreases, then the flow of electrons decreases.

Question 23

• Fire detection systems use methods like FWD cargo fire bottles, APU fire bottles, and engine fire bottles, melting link detectors, differential expansion detectors, and gas-filled detectors

Question 24

• The purpose of a hydraulic sequence valve is to sequence certain events only after completing the previous one for re-sequencing in a power system.

Question 25

• When air is pressurized by an engine-driven compressor, it is heated.

Question 26

• "Mach Tuck" or "Tuck Under" is associated with flying at high subsonic speeds.

Question 27

• EMF is measured in units of voltage.

Question 28

• An aircraft in level flight with increasing cabin altitude will result in a decrease in pressure differential.

Question 29

• Ice on the front windshield of large systems is prevented using electrically heated windshields.

Question 30

• When gases pass through a convergent duct, the velocity increases and temperature/pressure decreases.

Question 31

• Current is the number of electrons passing a given point in a conductor per second.

Question 32

• A cannular combustion system involves a set of flame tubes enclosed in a common air casing.
• A set of flame tubes enclosed in a common air casing.

Question 33

• Class D compartments, which are not accessible by crew during flight, must be lined with fire-resistant material to prevent fire from spreading beyond safe limits.

Question 34

• Semi-monocoque structures have a better strength-to-weight ratio compared to monocoque structures

Question 35

• High-lift devices are fitted on both leading and trailing edges of wings.

Question 36

• Lox refers to liquid oxygen

Question 37

• Flight spoilers rise on the wing with "up-going" ailerons

Question 38

• Inertia is the opposition a body offers to a change in motion.

Question 39

• Modern airplanes use upper surfaces (flaps, spoilers, and speed brakes) to improve aerodynamic performance by altering airflow over the wing surface.

Question 40

• Cabin pressure systems operate up to 8000 ft to provide sufficient oxygen supply for passengers.

Question 41

• A supercharger is an altitude-boosted supercharger.

Question 42

• APUs shut down in the event of fire, oil pressure failure and overheating.

Question 43

• Gas turbines use synthetic oil for lubrication

Question 44

• Hydraulic accumulators dampen pressure fluctuations and act as a backup for pressure pumps.

Question 45

• Power output for a piston engine is calculated by multiplying torque by RPM.

Question 46

• Wing underside stress in level flight (no turbulence) is called tension.

Question 47

• Modern jets use electric thermal blankets for ice removal.

Question 48

• Voltage is constant in batteries.

Question 49

• Bulkheads in wing structures help by providing strength and separating pressurized and unpressurized areas.

Question 50

• Engines with variable inlet guide vanes (variable stator vanes) can prevent compressor stall at low RPMs during acceleration/deceleration.

Question 51

• Electrolytes are highly corrosive and can cause extensive damage if spilled.

Question 52

• A non-return valve closes if inlet pressure exceeds outlet pressure

Question 53

• Jet pipes are insulated from the airframe by heat insulation and cooling air jackets.

Question 54

• A separator in an accumulator isolates the gas from the fluid.

Question 55

• Vc stands for cruising speed.

Question 56

• Anti-balance tabs move in the same direction as the primary control surfaces.

Question 57

• Aircraft electrical circuits use circuit breakers and fuses

Question 58

• Circuit breakers are frequently trip free and non-trip free.

Question 59

• Mach angle increases as mach number increases.

Question 60

• Vne is the maximum speed that can be flown under normal conditions.

Question 61

• Altitude, temperature, and position of control surfaces affect Vmcg, the minimum control speed for the gear.

Question 62

• Vlo is speed at which the landing gear can be extended or retracted.

Question 63

• Fluttering in aircraft is due to imbalance.

Question 64

• Tailerons combine the effects of elevator and aileron, or combinations of rudder and elevator, in controlling pitch and roll.

Question 65

• Propeller turning CW causes force on tail from the left side.

Question 66

• Increasing angle of attack on a cambered airfoil moves the center of pressure forward.

Question 67

• Dutch roll refers to oscillations in roll and yaw.

Question 68

• Mean camber line is the line drawn between the upper and lower surfaces of an airfoil, or between the trailing edge and leading edge.

Test your knowledge on aerodynamics and aircraft systems with this quiz. It covers topics such as drag, elevator trim tabs, and the principles of flight. Perfect for students or aviation enthusiasts looking to gauge their understanding of these essential concepts.