Aircraft General Knowledge Test Astana

In an aircraft with a fuel dumping system it will allow fuel to be dumped: Down to a predetermined safe value. Down to maximum landing weight. To leave 15 gallons in each tank. Down to unusable value.

In a non-stressed skin aircraft, bending loads acting on the wings are taken by: Skin. Ribs. Spars and skin. Spars.

A shuttle valve will: Automatically switch to a more appropriate source of hydraulic supply. Allow the accumulator to be emptied after engine shutdown. Reduce pump loading when normal system pressure is reached. Operate on a rising pressure, higher than the Full Flow relief valve.

In a bleed air anti-icing system the areas that are heated are: Wing leading edge slats and flaps. Wing leading edges and slats. Trailing edge flaps. The whole of the wing.

On what principle does the fuel contents gauging system work on a modern large aircraft?. Capacity affected by dielectric therefore changing EMF of system. Change in dielectric causes change in distance between plates and therefore changes capacitance. Changes in dielectric causes changes in capacitance. Capacity affected by dielectric therefore changing resistivity of system.

What does "octane rating" when applied to AVGAS refer to?. The volatility of the fuel. The anti-knock value of the fuel. The waxing point of the fuel. The ability of the fuel to disperse water.

The function of baffle check valves in a fuel tank is: To prevent pump cavitation. To prevent movement of fuel to the wingtip in flight. To reduce fuel flow at altitude. To prevent fuel surge during manoeuvring.

Static inverters in modern aircraft are units that can convert 1._____electrical power to 2._____. 1. 115 V DG; 2. 24 V DC. 1. 24 V DC; 2. 115 V AC. 1. 115 V AC; 2. 24 V DC. 1. 24 V AC; 2. 24 V DC.

What is the function of the hydraulically powered actuators in a fully powered flight control system?. The actuators convert hydraulic pressure into control surface movements. The actuators operate the control valves, which in turn move the control surfaces. The actuators convert hydraulic pressure only into control column movements. Fully powered flight control systems are without actuators.

Power for windshield heating is usually. 28 volts DC. 3 phase AC. Single phase AC. 115 volts DC.

Why, in the bootstrap system, is the air compressed before it enters the heat exchanger?. To ensure most rapid cooling through the heat exchanger. To provide a constant temperature airflow to the cabin. To ensure maximum pressure and temperature drop across the turbine. To provide a constant mass flow to the cabin.

If during pressurized flight the outflow valve closes fully due to a fault in the pressure controller the: ECS packs are automatically closed down. The inward relief valve will open to prevent excessive negative differential. Safety valve opens when the differential pressure reaches structural max diff. Skin will be overstressed and could rupture.

Smoke hoods protect: Mouth and nose and provide a continuous flow of oxygen. Full face and provide a continuous flow of oxygen. Full face and provide oxygen on demand. Mouth and nose and provide oxygen on demand.

Oxygen cylinders are normally charged to: 1200 PSI. 1800 PSI. 2000 PSI. 1000 PSI.

How do the gas parameters change within the stator of a compressor stage?. Pressure decreases and the speed decreases. Pressure increases and the speed decreases. Pressure increases and the speed increases. Pressure decreases and the speed increases.

What is the purpose of inboard ailerons:?. To reduce wing twist at high speed. To reduce wing bending at high speed. To reduce wing bending at low speed. To reduce wing twisting at low speed.

What color is the hydraulic liquid in a modern jet airliner?. Pink. Purple. Red. Yellow.

On what principle do smoke detectors work?. Optical and ionization. Ionization and impedance. Inductance and light diffraction. Resistance and capacitance.

An underinflated tyre on a dry runway: Will cause the tyre temperature to reduce PO Flag this question 0 View explanation. Increases wear on the shoulder. Increases wear on the crown. Increases viscous aquaplaning speed.

In a fan jet engine the bypass ratio is: Internal mass airflow divided by mass fuel flow. Mass fuel flow divided by mass fuel flow. Internal mass airflow divided by external mass airflow. External mass airflow divided by internal mass airflow.

What are flaperons?. What are flaperons?. Combined spoiler and flap. Combined flap and ailerons. Combined ailerons and elevators.

The purposes of an accumulator in a hydraulic system are to. Damp pressure fluctuations and serve as a main pressure source for normal operation. Damp pressure fluctuations and serve as a limited alternate source of pressure. Cool the hydraulic fluid and serve as a main pressure source for normal operation. Cool the hydraulic fluid and serve as a limited alternate source of pressure.

What is the purpose of the torque links in a landing gear leg?. To position the wheels in the correct attitude prior to landing. To prevent shimmy. To transfer the brake torque to the wheel. To prevent the wheel rotating around the leg.

The fuel cross-feed valves are fitted in order to facilitate: Refueling when only one bowser is in use. The use of fuel from any tank to any engine. Transfer of fuel between the main fuel tanks. Isolation of the engine from the fuel system in the case of an engine fire.

The purpose of a refueling volumetric top off unit (VTO) is: To close the tank vent system when the tank is full Pi Flag this question 0 View explanation. To close the surge check valves in the outboard tanks to keep the tank full until the centre tank fuel has been used. To close the fueling valve when the tank is full. To keep the feeder box full of fuel at all times.

The purpose of a ditching control valve is: To allow rapid depressurisation. To dump the toilet water after landing. To close the outflow valves. To open outflow valves.

In a gas turbine engine fuel system, why is the fuel heater before the filter?. To prevent water in the fuel freezing and blocking the filter. To prevent the fuel from freezing and blocking the filter. To help vaporization of the fuel. To prevent "waxing".

The type of smoke detection system fitted to aircraft is: Optical and ionization. Chemical. Magnetic. Electrical.

An impulse coupling in a magneto is provided to: Generate high voltage and advance the spark for starting. Allows a low energy value when continuous ignition is selected. Generate high voltage and retard the spark for starting. Increase the energy to the spark plug as the rpm increases.

Emergency oxygen is provided by: One system for both flight deck and cabin. Two systems each capable of supplying the flight deck and cabin. Three systems, one for the flight deck, one for the passengers and one for the cabin crew. Two independent systems, one for flight deck, one for cabin.

Hydraulic reservoirs are pressurized by: Ram air in flight only. Engine bleed air from turbine engine. Separate helium gas system. Air from the air conditioning system.

The properties of Duralumin are: 1. Aluminium/copper base 2. Aluminium/magnesium base 3. Hard to weld 4. Easy to weld 5. Good thermal conductivity 6. Poor resistance to air corrosion. 2, 3 and 5. 1, 2 and 3. 4, 5, and 6. 1, 3 and 5.

In a normally aspirated piston engine carburettor icing can occur: In temperature ranges of -7°C to as high as +33°C with visible moisture present. Only below 0°C and no visible moisture. Only below 0°C. Only above 5000 ft.

The flight deck warning on activation of an engine fire detection system is: Warning light and warning bell. Gear warning. Warning bell. Warning light.

Fuel tank booster pumps are: Spur gear pumps - low pressure. Centrifugal pumps - high pressure. Centrifugal pumps - low pressure. Spur gear pumps - high pressure.

Where is EGT measured?. HP turbine outlet. Combustion chamber. In the jet pipe. HP compressor outlet.

Where are smoke detectors fitted?. Toilets and cargo compartments A, B, C, D. E. Toilets and cargo compartments B, C. E. All cargo compartments. Toilets.

An axial flow compressor when compared to a centrifugal compressor: Takes in less air and is less prone to rupturing. Takes in less air and is more prone to rupturing. Takes in more air and is more prone to rupturing. Takes in more air and is less prone to rupturing.

If an artificial feel unit were fitted it would be connected: In parallel with the primary controls. In parallel with the secondary controls. In series with the secondary controls. In series with the primary controls.

The function of the baffles in a fuel tank is: To prevent pump cavitation. To prevent fuel surge (or sloshing) during manoeuvring. To reduce fuel flow at altitude. To prevent movement of fuel to the wingtip.

What is engine pressure ratio?. Turbine outlet pressure* compressor outlet pressure. The ratio of turbine inlet pressure to compressor inlet pressure. The ratio of turbine outlet pressure to compressor inlet pressure. Compressor inlet pressure divided by turbine outlet pressure.

Which part of the gas turbine engine limits the temperature?. Compressor. Turbine. Combustion chamber. Exhaust.

A magneto is switched off by: Open circuiting the secondary circuit. Grounding the secondary circuit. Open circuiting the primary circuit. Grounding the primary circuit.

A stage in an axial compressor. Has a compression ratio in the order of 2.1:1. Consists of a ring of stator blades followed by a rotor disc. Has a compression ratio in the order of 0.8:1. Consists of a rotor disc followed by a ring of stator blades.

In a centrifugal compressor: The air enters the eye radially and leaves the tip tangentially. The air enters the eye tangentially and leaves the periphery axially. The air enters the impeller axially at the eye and leaves at the periphery tangentially. The air enters the periphery axially and leaves the eye tangentially.

The fuel tanks of a modern passenger airliner are filled by: Fuel is pumped in by the fuel truck. The VTO system. Gravity. Fuel is sucked in by the aircraft pumps.

An ion detector detects: Light. Smoke and fire. Smoke. Overheat.

The EGT indication on a piston engine is used: To monitor the oil temperature. To indicate cylinder head temperature. To assist the pilot to adjust the fuel mixture. To control the cooling air shutters.

The thrust reverser light illuminates on the flight deck annunciator when the: Thrust reverser doors are locked. Thrust reverser doors are unlocked. Thrust reverser doors have moved to the reverse thrust position. Thrust reverser doors have been selected but the doors have not moved.

An aircraft is certified to fly higher than 25 000 ft and to carry a maximum of 240 passengers, it is configured to carry 200 and actually has 18 passengers on board. The minimum number of drop-down oxygen masks provided must be: 240. 220. 180. 200.

On a modern turboprop aircraft the method of anti-icing/de-icing the wings is: Fluid. Pneumatic boots. Electrical heater mats. Hot air bled from the engines.

The characteristics of hydraulic fluids are: Thermal stability, anti-corrosive and high volatility. Thermal stability, anti-corrosive and high flash point. Thermal stability, high compressibility and high volatility. Anti-corrosive, high flash point and high compressibility.

In a bootstrap air conditioning system what is the first thing the air does?. Goes through the compressor, secondary heat exchanger, turbine. Goes through the compressor, turbine, secondary heat exchanger. Goes through the turbine, compressor and secondary heat exchanger. Goes through the primary heat exchanger, compressor then secondary heat exchanger.

What limits the max temperature in a gas turbine engine?. Temperature at the turbine. Temperature at the exhaust. Temperature entering the combustion chamber. Temperature in the combustion chamber.

In a twin jet fuel system what is the function of a feeder box?. To prevent pump cavitation. To equally distribute the fuel to each tank during refuelling. To control the amount of fuel remaining during fuel dumping. To feed fuel to the volumetric top-off unit.

Oxygen supplied to the flight deck is: Chemically generated. diluted with ambient air if required. Gaseous. diluted with cabin air if required. Chemically generated and diluted with cabin air if required. Gaseous. diluted with ambient air if required.

When does the engine High Pressure fuel shut off valve close?. When flight idle is selected. After a booster pump failure. When the engine fuel switch is selected on during engine start. When the engine fuel switch is selected off during engine shutdown.

What ice protection system is used on most modern jet transport aircraft?. Electrical. Hot air. Pressure operated boots. Liquid.

What is the purpose of the FCOC (Fuel-cooled Oil Cooler)?. To bypass oil to the engine if the oil pressure filter becomes blocked. To heat the oil and cool the fuel. To heat the fuel and cool the oil. To maintain the oil at the correct temperature.

The engine fire extinguisher system is activated: Automatically after a time delay to allow the engine to stop. By the pilot when required. After the engine has been shut down. Automatically when a fire warning is sensed.

In very cold weather the pilot notices slightly higher than normal oil pressure on start up. This: Is acceptable providing it returns to normal after start up. Indicates an oil change is required. Is indicative of a blocked oil filter. Is abnormal but does not require the engine to be shut down.

What is the purpose of trim tabs?. To reduce stick holding forces to zero. To reduce stick forces in manoeuvres. To reduce control effectiveness. To increase control effectiveness.

In an AC distribution system what is the purpose of the GCB?. Maintains constant frequency. Connects the load busbar to the synchronizing busbar. Controls generator field excitation. Connects a generator output to its load busbar.

What makes the non-rigid fittings of compressor and turbine blades rigid when the engine is running?. Thrust and drag forces. Aerodynamic and centrifugal force. Spring locks. Tapered bead seats.

How do you control the power in a jet engine?. By controlling the mixture ratio. By controlling the fuel flow. By controlling the airflow. By controlling the bleed valves.

In a modern airliner what is the hydraulic fluid used?. Minera/alcohol. Vegetable. Mineral. Synthetic.

The purpose of the Transformer Rectifier Unit (TRU) is to. Separate the AC systems (powered by the generators) from the DC systems (powered by the batteries). Convert AC power into DC power at a different (usually lower) voltage. Convert DC power into AC power at a different (usually higher) voltage. Separate the DC systems (powered by the generators) from the AC systems (powered by the batteries).

What voltage is supplied to booster pumps on a modern jet airliner?. 12 V DC from the battery. 200 V AC three phase. 115 V AC single phase. 28 V DC from an inverter.

Hydraulic pressure typically used in the system of large transport aircraft is: 1000 - 2000 psi. 3000 - 4000 psi. 4000 - 5000 psi. 2000 - 3000 psi.

An artificial feel system is needed in the pitch channel if the: Elevators are controlled through an irreversible servo system. Elevator is controlled through a servo tab. Elevators are controlled through a reversible servo system. Airplane has a variable incidence tailplane.

A basic artificial Q feel system gets input from: Spring box. Static pressure. Hydraulic actuator and a servo valve. Dynamic pressure.

Auto brakes are disengaged: On the landing roll when the autopilot is disengaged. When the speed falls below 20 kt. By the pilot. When the ground spoilers are retracted.

Specific fuel consumption is the mass of fuel burned per (1)_____divided by the (2)_____produced. (1) hour, (2) speed. (1) hour, (2) thrust. (1) mile, (2) thrust. (1) mile, (2) speed.

What happens to pressure, temperature and velocity of the air in the diffuser of a centrifugal compressor?. Velocity increase, pressure and temperature decrease. Velocity, pressure and temperature increase. Velocity decrease, pressure and temperature increase. Velocity, pressure and temperature decrease.

What type of fire extinguisher would be used on a propane fire?. Foam. Sand. Water. Dry powder.

The passenger oxygen drop-down mask stowage doors are released: By a lanyard operated by a barometric capsule. Electrically for chemical oxygen generators and pneumatically for gaseous system. Manually by the cabin crew. Mechanically.

If an aircraft maximum operating altitude is limited by the pressure cabin, this limit is due to: The maximum positive pressure differential at maximum cabin altitude. The maximum zero fuel mass at maximum pressure altitude. The maximum number of pressurization cycles. The maximum positive pressure differential at maximum operating ceiling.

Electrical motors on aircraft can be. DC 60 Hz. AC 400 Hz. AC 115 Hz. DC 115 Hz.

A fuel dumping system is: All aircraft manufactured after 1997 having a MTOM of 7500 kg or more. Aircraft whose maximum landing mass (MLM) is significantly lower than its maximum take-off mass (MTOM). All aircraft with a seating capacity of 250 or more. All aircraft in the Transport Category having a maximum take-off mass (MTOM) of 75000 kg or greater.

A gas turbine engine having a single spool, the compressor will rotate: Independently of the turbine. Slower than the turbine. Faster than the turbine. At the same speed as the turbine.

With regard to an air cycle type ECS pack, where is the water separator fitted?. After the cold air unit turbine. Before the cold air unit compressor. After the humidifier. Between the compressor and turbine.

In an air cycle air conditioning system what is the function of the ground-cooling fan?. To draw cooling air over the heat exchangers. To draw cooling air over the turbine. To blow air into the compressor. To re-circulate air through the mix manifold.

In the event that an emergency decent causes the cabin pressure to decrease below ambient pressure: The safety valve will close. The outward relief valve will open. The inward relief valve will open. The outflow valve will close.

Which of the following are used to limit rudder deflection? 1. Ratio changer 2. Gust lock 3. Variable stops 4. Control locks 5. Blow-back. 2, 4 and 5. 3, 4 and 5. 1, 3 and 5. 2, 3 and 5.

When does the Low-Pressure fuel shut off valve close?. After a booster pump failure. When the fire handle is pulled. When flight idle is selected. When the engine fuel switch is selected "on" during engine start.

When smoke appears in the cockpit, after donning the oxygen mask the pilot should select. Emergency. Diluter. 100%. Normal.

A twin jet aircraft would normally be refueled by which of the following methods?. Suction refueling. Overawing refueling. Pressure refueling. Open line refueling.

The principle of operation of firewire is: Positive coefficient of resistance, negative coefficient of capacitance. Positive coefficient of capacitance, negative coefficient of resistance. Positive coefficient of impedance, negative coefficient of inductance. Positive coefficient of inductance, negative coefficient of impedance.

Consider an aircraft in which the only electrical sources are the engine and APU generators, plus a battery. During the cruise all AC generator are lost. The essential AC bus will be. Powered directly by the battery, to provide electrical power to aircraft components and controls. Powered from the battery via an inverter, to provide electrical power to aircraft essential components. Lost as there is NO AC source available to power it. Self-powered, as it can store energy to provide electrical power to aircraft essential componets.

An axial compressor in a gas turbine engine, when operating below its design speed, has: A tendency to stall in the front stages. A tendency to stall in the centre stages. A tendency to stall in the rear stages. No tendency to stall,.

An unpressurized aircraft is flying above FL100 and therefore must have sufficient oxygen for: Both pilots only. Both pilots immediately and the cabin crew plus all passengers after 30 minutes above FL100 but below FL130. Both pilots and all passengers. Both pilots immediately and the cabin crew plus some passengers after 30 minutes above FL100 but below FL130.

As altitude increases what does the mixture control do to the fuel flow?. Increases flow due to increased air density. Reduces flow due to reduced air density. Reduces flow due to increased air density. Increases flow due to reduced air density.

The correct extinguisher to use on a brake fire would be: Water. Foam. CO2. Dry powder.

Long haul aircraft are not used as short haul aircraft because: Checklists would be too time consuming to complete. Structures are given fatigue lives based on their use. It would use too much fuel. Some tanks will be empty the whole time imposing too much strain on the aircraft.

What is the purpose of the diluter demand valve in the emergency oxygen system?. To dilute oxygen with air in crew oxygen system. To supply air only when inhaling. To dilute oxygen with air in passenger oxygen system. To supply oxygen only when inhaling.

What frequency is commonly used in aircraft electrical distribution systems?. 400 Hz. 100 Hz. 200 Hz. 50 Hz.

What is a ram air turbine (RAT) which drives a hydraulic pump used for?. Nose wheel steering. Landing gear extension if the normal system fails. Flight controls in case of failure of the engine driven system. Flap extension.

At what height is it mandatory for one of the flight deck crew to wear an oxygen mask?. 37000 ft. 32000 ft. 41000 ft. 25000 ft.

The purpose of a hydraulic fuse is to: Allow a reduced pressure to the wheel brake system to avoid locking the wheels. Allow the parking brake to remain on overnight if required. Prevent over-pressurizing the reservoir as altitude increases. Prevent loss of system fluid if the pipeline to a brake unit should rupture.

A hot busbar is one that: Carries all of the non-essential loads. Is permanently connected to the battery. Is connected to the battery in an emergency. Supplies galley power.

An undercarriage leg is considered to be locked when: The amber light is on. It is down. Mechanically locked by an "over-centre" mechanism. The actuating cylinder is at the end of its travel.

The function of stringers in the construction of the fuselage is: to provide support for the skin and to absorb some of the pressurization strain as tensile loading. to provide an alternate load path in the event of the failure of a frame. to provide an attachment for insulation. to withstand shear stress.

The advantage of a float type fuel gauging system is: 1. Simple 2. Compensates for variations of SG 3. Reads fuel quantity by mass 4. Compensates for change of aircraft attitude. 3 & 4. 2 & 3. 1 & 3. 1 only.

Trailing edge flaps on large transport aircraft are normally powered. Hydraulically with electrical back-up. Pneumatically with hydraulic back-up. Manually with electrical back-up. Electrically with hydraulic back-up.

Hydraulic fluid: Is harmful to eyes and skin, and is also a fire hazard. Needs no special treatment. Is a fire hazard. Is harmful to eyes and skin.

In a stressed skin aircraft, bending loads acting on the wings are taken by: Ribs and stringers. Stringers and spars. Spars and stringers. Spars and skin.

In a gas turbine engine, the Inlet Guide Vanes (IGV). Reduce the velocity of the air entering the combustion section. Direct the airflow at the optimal angle to the compressor s first stage. Direct the airflow at the optimal angle into the diffuser. Increase the velocity of the air entering the compressor.

On what principle does a fuel flowmeter work?. Pressure and temperature. Volume and viscosity. Quantity of movement. Capacitive dielectric.

What is the coefficient of friction on an aquaplaning (hydroplaning) tyre?. 0.1. 0.0. 1.0. 0.5.

Load shedding is: Transferring the loads between generators. Increasing circuit resistance. Overall reductions of the loads on the system. Reducing the load voltage.

What is the purpose of a surge box inside a fuel tank?. Prevent sloshing of fuel away from pump inlet during abnormal manoeuvres. Allow movement of fuel between tanks while refuelling. Ventilate the tank during high pressure refuelling. Collect sediment at the bottom of the tank.

An aircraft which uses DC as the primary source of power, AC for the instruments may be obtained from: Rectifier. CSDU. TRU. Inverter.

Kreuger flaps are positioned: Along the whole leading edge. Towards the wing tip. At the wing trailing edge. At the wing inner leading edge.

Aircraft above a certain capacity must carry a crash axe, it is provided to: Enable access behind panels and soundproofing to aid fire fighting. Restrain disorderly passengers. Cut firewood in a survival situation. Cut through the aircraft fuselage to allow escape.

EPR is measured by the ratio of: High pressure compressor inlet pressure to exhaust pressure. Turbine pressure to combustion chamber inlet pressure. Low pressure compressor inlet pressure to high pressure compressor outlet pressure. Exhaust pressure to low pressure compressor inlet pressure.