WorksheetsAircraft Engineering Multiple Choice Questions
Total questions: 100
Worksheet time: 50mins
For an aeroplane with a true pressure of 8 bars, there is a risk of dynamic hydroplaning as soon as the:
Water depth is equal to the half of the depth to tyregrooves
Speed is greater than 127 kt.
Speed is greater than 98 kt.
Cross wind is greater than 98 kt.
For an aeroplane with a true pressure of 16 bars, there is a risk of dynamic hydroplaning as soon as the:
Water depth is equal to the half of the depth to tyregrooves
Cross wind is greater than 15 kt.
Speed is greater than 138 kt.
Speed is greater than 117 kt.
Aircraft piston engines have reached a very high state of mechanical perfection and have a relatively long working life. These can be lost due to:
Coarse, rough handling of the throttle and mixture control
Detonation and increased fuel consumption
Performing magneto serviceability checks at 1000 RPM
The capacity of a battery is the:
No-load voltage of the battery multiplied by its output current
Numbers of cycles (charging and discharging) that a battery can withstand without deterioration of its cells
Intensity withstood by the battery during charging
Amount of Ampere hours that a fully charged battery can supply
All aircraft electrical systems include battery, used to:
Increase the capacitance for normal operations
De-stabilize the power during switching of transitory loads
Supply power to essential services in the event of generator failure
A hung (abortive) start of a gas turbine engine may be caused by:
Compressor surging
A too low pneumatic starter pressure
Failure of the fuel to ignite in the starting sequence after the engine has been accelerated to the required rpm by the starter
In which part of a gas turbine engine are high temperature requirements most critical for the materials used?
The last part of the HP compressor and front part of the HP turbine
The combustion chamber and exhaust nozzle
The combustion chamber and front part of the HP turbine
The turbine and exhaust nozzle
A diluter demand oxygen regulator selected to 100%:
Delivers oxygen flow only above FL100
Is only recommended for use with smoke in the cockpit
Mixes air and oxygen in a passenger oxygen mask
Delivers oxygen flow when inhaling
Each cylinder in piston engine has:
3 valves
1 valves
2 valves
Electricity powered ice protection devices on aircraft are:
Used as de-icing devices for pitot-tubes, static port and windshield
Used as anti-icing devices for pitot-tubes, static port and windshield
Used for large surface only
Used primarily because they are very efficient
checks at 1000 RPM
When carrying out a battery condition check using the aircraft’s voltmeter
No load should be applied to the battery because it would reduce the voltage
A load should be applied to the battery in order to give a better indication of condition
The load condition is unimportant
The battery should be isolated
Transformers are extremely versatile devices that can be used: - To pass Direct Current and block Altering Current
To step up or down Alternating Current voltage
To pass Direct Current and block Altering Current
An aeroplane accelerates from 80 kt to 160 kt at a load factor equal to 1. The induced drag coefficient (i) and the induced drag (ii) alter with the following factors:
(i) 1/16 (ii) 1/4
(i) 1/2 (ii) 1/16
(i) 4 (ii) 1/2
(i) 1/4 (ii) 2
Wind shear is:
A variation in vertical or horizontal wind velocity and / or wind direction over a large distance
A variation only in vertical wind velocity over a short distance
A variation only in horizontal wind velocity over a short distance
A large variation in vertical or horizontal wind velocity and / or wind direction over a short distance
When selected to normal, the oxygen/air ratio of the mixture supplied by the cockpit oxygen system regulator:
Is 100%
Is constant whatever the altitude
Increases when the altitude increases
Decreases when the altitude increases
While maintaining the same True Air Speed (TAS), with an increase in altitude:
The IAS should also increase
The IAS will be unaffected
The indicated Air Speed (IAS) will reduce
The total reaction has two components:
Lift and relative airflow
Lift and rotational airflow
Lift and drag
208. Windshear may be described as a change in wind direction and/or speed in space, including updraughts and downdraughts. The amount of control action required to counter the effects of windshear is:
minimal
moderate
significant
none
Transformer rectifiers can:
Generate Alternating Current (AC) of higher or lower voltage
Maintain constant Direct Current (DC) voltage
Generate Direct Current (DC) of higher or lower voltage
In what way do induced drag and parasite drag alter with increasing speed in straight and level flight?
(1) increases and (2) increases
(1) decreases and (2) increases
(1) increases and (2) decrease
(1) decreases and (2) decreases
Lift is generated when:
The flow direction of a certain mass of air is changed
A certain mass of air is retarded
A symmetrical aerofoil is placed in a highly velocity air stream at zero angle of attack
A certain mass of air is accelerated in its flow direction
Which statement is correct for a gas turbine engine with a constant speed propeller and free power turbine, when the power setting is increased?
1 is incorrect, 2 is incorrect
1 is incorrect, 2 is correct
1 is correct, 2 is incorrect
1 is correct, 2 is correct
The wing ice protection system currently used on most large jet transport aeroplane is an:
Electrical de-icing system
Pneumatic system with inflatable boots
Hot air system
Liquid de-icing system
For piston engines, mixture ratio is the ratio between the:
Mass of fuel and mass of air entering the cylinder
Mass of fuel and volume of air entering the carburetor
Volume of fuel volume of air entering the cylinder
Volume of fuel and volume of air entering the carburetor
The ABS (Auto Brake System) is disconnected during landing:
When selecting the revers thrust
Automatically
Below a specific speed
By pilot action
One of the causes of high oil temperature in a gas turbine engine at constant power setting is:
Usually high scavenge pump oil flow
High outside air temperature
Malfunction of the heat exchanger
High oil pressure
On a normally aspirated engine, the manifold pressure gauge always indicates:
A value equal to the atmospheric pressure when the engine is at full power on the ground
A greater value than atmospheric pressure when the engine is running
A lower value than the atmospheric pressure when the engine is running
Zero on the ground when the engine is speed
In a gas turbine engine, the propelling jet is generated by:
Compression of hot gases resulting in a conversion of kinetic energy (velocity) into (mechanical) work
Expansion of hot gases resulting in a conversion of potential energy (pressure) into kinetic energy (velocity)
Compression of hot gases resulting in a conversion of potential energy (pressure) into kinetic energy (velocity)
Expansion of hot gases resulting in a conversion of potential energy (pressure) into (mechanical) work
When the combustion gases pass through turbine stage the:
Temperature increases
Pressure drop
Temperature remains constant
Pressure rises
According with DOC 4444 (ICAO), a wake turbulence non-radar separation minima of 3 minutes shall be applied to:
LIGHT aircraft landing behind a MEDIUM aircraft
MEDIUM aircraft landing behind a HEAVY aircraft
LIGHT aircraft taking-off behind a MEDIUM aircraft when aircraft are using the same runway
LIGHT aircraft taking-off behind a MEDIUM aircraft from a parallel separated by less than 760 m. (using whole runway)
According DOC 4444 (ICAO), a wake turbulence non-radar separation minima of 2 minutes shall be applied to:
MEDIUM aircraft taking –off behind a HEAVY aircraft from an intermediate part of a parallel separated by less than 760m.
MEDIUM aircraft landing behind a HEAVY aircraft
LIGHT aircraft taking-off behind a MEDIUM aircraft from an intermediate part of the same runway
LIGHT aircraft landing behind a MEDIUM aircraft
Regarding wake turbulence, what is the ICAO minimum non-radar separation time for a LIGHT aircraft behind MEDIUM or HEAVY aeroplane on approach to the same runway?
4 minutes
5 minutes
3 minutes
2 minutes
Electrical power is measured in:
Nanos
Amps
Watts
Fuel pumps submerged in the fuel tanks of a multi-engine aircraft are:
used to supply fuel under pressure to the engines
used only for emergency situations
located outside the fuel tanks
not required for engine operation
Which of the following is a type of pump?
High pressure variable swash plate pumps
Low pressure variable swash plate pumps
Centrifugal high pressure pumps
Centrifugal low pressure type pumps
The “Ram Air Effect” has a significant effect on:
Thrust and airspeed
Thrust
Airspeed
The main purpose of turbocharger is to:
Provide a richer mixture at higher altitudes
Reduce the fuel flow
Maintain power with increasing altitude
Provide a leaner mixture at sea level
Regarding a jet engine:
1 is incorrect, 2 is incorrect
1 is incorrect, 2 is correct
1 is correct, 2 is incorrect
1 is correct, 2 is correct
Just after take-off an aircraft encounters a microburst situated directly ahead. The initial indications will be:
1,3
2,4
1,4
2,3
The tyre pressure of an aeroplane main landing gear is 10.8 bars. There is a risk of hydroplaning as soon as the speed reaches:
56 kt
145 kt
87 kt
113 kt
The capacity of a battery is given in:
Ampere hours
Watts
Ohms
Amperes/volts.
The purpose of stingers, used in fuselage construction, is to:
Absorb shear stresses
Carry the loads due to pressurization and convert them into tensile stress
Assist the skin to absorb longitudinal compressive loads
Provide sound and thermal insolation
When there is a risk of hydroplaning the pilot of an aeroplane:
Should use normal landing-braking-and reverse technique
Should use maximum reverse thrust however should start braking below the hydroplaning speed
Should make a positive landing and apply maximum reverse thrust and brakes as quickly as possible
Must wait for landing until the risk for hydroplaning is no longer existing
Viscous hydroplaning occurs primary if the runway is covered with a thin film of water and:
Is rough textured
Is very smooth and clean
Is very smooth and dirty
The tyres treads not in a good state
The primary reason for venting an engine oil tank is to:
Cool the oil
Allow for expansion of hot oil
Prevent excessive pressure in the tank
Prevent overflow
When leaning the mixture for the most economic cruise fuel flow, excessive leaning will cause:
Low cylinder head
High manifold pressure
High cylinder head
High engine RPM
Regarding a jet engine:
1 is correct, 2 is incorrect
1 is correct, 2 is correct
1 is incorrect, 2 is incorrect
1 is incorrect, 2 is correct
What will happen in ground effect?
The wing downwash on the tail surfaces increases
The induced angle of attack and induced drag decrease
The thrust required will increase significantly
The wing tip vortices increase in strength
The part of a piston engine that transforms reciprocating movement into rotary motion is called the:
Reduction gear
Camshaft
Crankshaft
Piston
Which statement is correct for a gas turbine engine with a constant speed propeller and free power turbine, when the power setting is decreased?
1 is correct, 2 is incorrect
1 is incorrect, 2 is correct
1 is incorrect, 2 is incorrect
1 is correct, 2 is correct
One of the advantage of turbocharger is:
To make the power available less effected by altitude
An increased propulsive efficiency
That there is no danger of detonation
That there is no torsion at the crankshaft
Lift is the :
Component of the total aerodynamic force, perpendicular to the local airflow
Vertical component of the total aerodynamic force, perpendicular to the undisturbed
Component of the total aerodynamic force, perpendicular to the mean aerodynamic
Component of the total aerodynamic force, perpendicular to the undisturbed airflow
Comparing the lift coefficient and drag coefficient at normal angle of attack:
CL has approximately the same value as CD
CL is much lower than CD
CL is much greater than CD
CL is lower than CD
Input and output of a static inverter are respectively:
AC and AC
AC and DC
DC and DC
DC and AC
An impulse coupling is installed on a magneto of a piston engine to:
Absorb starting loads
Facilitate quick removal and installation
Provide a stronger spark on top dead centre for engine starting
Advance the ignition timing
One of the advantages of an annular combustion chamber is:
A higher structural strength
A simpler assembly
The fewer igniters are required
Regarding a jet engine:
1 is incorrect, 2 is incorrect
1 is incorrect, 2 is correct
1 is correct, 2 is correct
1 is correct, 2 is incorrect
Generally, for large aeroplanes, electrical heating for ice protection is used on:
Fin leading edge
Slat leading edge
Elevator leading edges
Pitot tubes
If the electrical load of an AC generator providing a constant output voltage increases, the voltage regulator will:
Decrease the excitation current
Increase the excitation current
Maintain the excitation current constant
Change direction of the excitation current
A flat rated turbofan engine has a constant maximum rated thrust level:
Up to a specific pressure altitude
Above a specific pressure altitude
Above specific OAT
Up to a specific OAT
The lift-and drag forces, acting on a wing cross section:
Are proportional to each other, independent of angle of attack
Depend on the pressure distribution about the wing cross section
Vary linearly with the angle of attack
Are normal to each other at just angle of attack
Pre-ignition refers to the condition that may arise when:
A rich mixture is ignited by the sparking plug
The mixture is ignited before the piston has reached top dead centre
For a subsonic airflow, in a divergent duct the:
Pressure decreases, velocity increases and temperature decreases
Pressure increases, velocity decreases and temperature increases
Pressure decreases, velocity increases and temperature increases
Pressure increases, velocity decreases and temperature decreases
Magnetic chip detectors are fitted in the oil system:
Collecting any carbon particles in the oil
To indicate low oil viscosity
Collecting any ferrous metal particles in the oil
Parameters to monitor a hydraulic system in the cockpit can be:
Pressure, fluid temperature and quantity
Pressure and RPM of the hydraulic pump
Pressure and fluid viscosity
Pressure and hydraulic pump output
The purpose of the oil and the nitrogen in an oleo-pneumatic strut is:
The oil supplies the spring function and the nitrogen supplies the damping function
The oil supplies the sealing and lubrication function, the nitrogen supplies the damping function
The oil supplies the damping and lubrication function, the nitrogen supplies the heat-dissipating function
The oil supplies the damping function and the nitrogen supplies the spring function
In a piston engine, the purpose of an altitude mixture control is to:
Prevent a weak cut when the throttle is opened rapidly at altitude
Enrich the mixture due to decreased air density at altitude
Weaken the mixture because of reduced exhaust back pressure at altitude
Correct for variations in the fuel/air ratio due to decreased air density at altitude
The minimum requirements for supplemental Oxygen to be supplied in pressurized aeroplanes during and following an emergency descent are that for pilots it shall be available for the entire flight that the cabin pressure altitude exceeds a minimum of X feet. That minimum of X feet is:
14000 ft
25000 ft
13000 ft
15000 ft
Electrically powered ice protection devices on aircraft are:
Used as de-icing devices for pitot tubes, static ports and windshield
Used as anti-icing devices for pitot-tubes, static ports and windshield
Used for large surfaces only
Used primarily because they are very efficient
The wing ice protection system currently used on most large jet transport aeroplanes is an:
Electrical de-icing system
Pneumatic system with inflatable boots
Hot air system
Liquid de-icing system
On normally aspirated engine, the manifold pressure gauge always indicates:
A value equal to the atmospheric pressure when the engine is at full power on the ground
A greater value than atmospheric pressure when the engine is running
A lower value than atmospheric pressure when the engine is running
Zero on the ground when the engine is stopped
The purpose of stringers, used in fuselage construction, is to:
absorb shear stresses
carry the load due to pressurization and convert them in tensile stress
assist the skin to absorb longitudinal compressive loads
provide sound and thermal insolation
The input and output of a static inverter are respectively:
AC and DC
AC and AC
DC and DC
DC and AC
A flat turbofan engine has a constant maximum rated thrust level
Up to a specific pressure altitude
Above a specific pressure altitude
Above a specific OAT
Up to a specific OAT
Turbine stage in sequence consists of:
Stator, rotor, turbine housing, bearing of the turbine
Bearing, turbine housing, rotor and stator
Turbine housing, rotor, stator, bearing of the turbine
A turbine engine with a bypass mass flow of 250 kg/s and HP compressor mass flow of 50 kg/s has a bypass ratio of:
4
5
6
1.2
The function of the air inlet is:
To present a relativity disorientation free, high-energy supply of air to the compressor
To prevent foreign object indigestion
To protect the compressor from hail damage
The principle of the 4-stroke internal combustion engine is:
To convert chemical energy into mechanical energy
To convert heat into momentum
To convert mechanical energy into heat
Concerning the starting procedures of a gas turbine engine:
If the air starter sizes, the engine can still be started by means of another air bleed
If the HP fuel valve is opened at a relatively high compressor rpm, this may result in a hot start
The higher the starter air pressure, the higher the EGT during starting
The selected igniters are activated after fuel is delivered to the fuel nozzle
Induced drag is created by the:
Span wise flow pattern resulting in the tip vortices
Separation of the boundary layer over the wing
Propeller wash blowing across the wing
Interference of the air stream between wing and fuselage
A slat will:
Prolong the stall to a higher angle of attack
Increase the lift by increasing the wing area and the camber of the aft portion of the wing
Provide a boundary layer suction on the upper surface of the wing
Increase the camber of the aerofoil and divert the flow around the sharp leading edge
The oil supply to gas turbine engine bearings is maintained in the event of the main oil filter becoming clogged by:
a back-up oil system
differential pressure opening the bypass valve of the main oil filter
the scavange pumps
the HP fuel pump
If smoke appears in the air conditioning, the initial action to be taken by the flight deck crew is to:
Cut off all air conditioning units
Begin an emergency descent
Put on the mask and goggles
Determine which system is causing the smoke
Two methods used to reduce induced drag are:
Decreasing the aspect ratio
Wash-out
Air flow separation control
Vortex de-generation
Wing tip design
A unit that converts electrical DC into AC is:
An AC generators
A thermistor
A transformer
An inverter
The purpose of baffles fitted in wing fuel tanks is to:
Prevent positive pressure build up inside the tank
Restrict undesirable fuel movement during side slip
Close the vent lines in case of turbulence
The octane rating:
Is a measure of the velocity of the fuel
Indicates the vapour pressure of the fuel
Is a measure of the fuel's resistance to detonation
A halon fire-extinguisher should be used on a fire of:
1,2,3
1,2,3,4
2,3,4
1,2,4
Ohm’s law states that:
The current flowing in a circuit is directly proportional to the coulombs that is applied to the circuit
The current flowing in a circuit is directly proportional to the applied voltage
The current flowing in a circuit is directly proportional to the resistance through which the current flows
The purpose of the spark plugs is to:
Assist with impulse coupling
Provide a break to determine the fuel/air ratio
Provide a break in the electrical circuit from the magneto
What is the most effective flap system?
Single slotted flap
Fowler flap
Plain flap
Split flap
The wing anti-ice system has to protect:
The whole upper wing surface and the flaps
The leading edge or the slats, either partially or completely
The whole leading edge and the whole under wing surface
Slats and the leading edge flaps only
Compared to a tyre fitted with an inner tube, a tubeless tyre presents the following characteristics: 1. High heating 2. Valve fragility 3. Lower risk of bursting 4. Better adjustment to wheels. The combination that regroups all of the correct statements is:
1,2,3,4
3,4
2,4
2,3
Which statement is correct?
1 is correct and 2 is incorrect
1 is correct and 2 is correct
1 is correct and 2 is correct
1 is correct and 2 is incorrect
Mass balancing of control surfaces is used to:
Limit the stick forces
Increase the stick force stability
Prevent flutter of control surfaces
Ensure that the control surfaces are in the mid-position during landing
In the absence of position and instrument error, IAS is equal to:
EAS
KAS
TAS
Detonation can be caused by a variety of reasons and is normally recognized by:
Loss of power
Increase in cylinder head temperature
Fluctuating oil pressure
One reason to fit a tip shroud to a turbine blade is to:
Reduce turbine temperatures
Provide a seal for the cooling airflow
Increase turbine efficiency
Prevent blade creep
Which of the following statements is correct about the flow divergent (subsonic) gas turbine engine intake?
1 is correct, 2 is incorrect
1 is incorrect, 2 is incorrect
1 is correct, 2 is correct
1 is incorrect, 2 is correct
Once the engine has started, ignition systems of piston engines are:
Dependent on the AC-Generator
Dependent on the DC-Generator
Independent of the electrical system of the aircraft
Dependent on the battery
