AGK | Wrong Questions Master
The accessory units driven by the accessory gearbox of a turbo-jet engine are the ___
- AC generator through its constant speed drive - Oil pumps - Hydraulic pumps - High pressure fuel pumps
The electronic engine control unit of a gas turbine engine FADEC uses data from ___
- Aircraft systems - Its own engine sensors
In an AC power generation system, the constant speed drive ___
- Can be disconnected from the drive shaft - Is hydromechanical - Can be disconnected during the flight
On the ground, the APU can provide ___
- Electricity - Air for main engine starting - Air for air conditioning
An aircraft magnet is switched off by the ___
- Ground the primary circuit - Ground the secondary circuit
From the options given below, select the three systems that could be provided with air from the pneumatic system of a piston engine
- Gyroscopic instruments - Pitot/Static instruments - Anti Ice
The reasons for disconnecting the CSD of an AC generator in flight are ___
- Low oil pressure in the CSD - High oil temperature in the CSD
For fail safe designed structural components ___
- There is more than one load carrying component - The design is based on the principle of redundancy of components
In a divergent inlet duct: - Speed ___ - Dynamic pressure ___ - Static pressure ___ - Static temperature ___ - Total pressure ___ - Total temperature ____
- decreases - decreases - increases - increases - remains constant - remains constant
A tubeless tyre has ___
- no built in air-tube - a radial side casing
In the hydraulic brake system of a transport aircraft, an accumulator is precharged with 1000psi. If the hydraulic system is then pressurised to its operating pressure of 3000psi, the indicated pressure in the accumulator should be ___
3000psi of nitrogen
How do smoke detectors operate?
A labyrinth optical detector, light reflects towards the photosensitive cell and the labyrinth has a shielding function
Bypass Ratio =
Bypass mass flow / HP compressor mass flow
in an alternator rotor coil you can find ___
DC
T/F - Considering an impulse turbine, the pressure drops across the rotor blades
False
T/F - Considering composite and metal structures, composite structures will give you the same tensile strength in all directions
False
T/F - Considering composite and metal structures, metal structures will give you higher strength to weight ratios than composite ones
False
T/F - Considering impulse turbines, the pressure remains constant across the nozzle guide vanes ___
False
T/F - Considering the jet engine, the maximum thrust decreases as the pressure altitude decreases.
False
T/F - Halon should only be used with caution, as it is highly corrosive on aluminimum components
False
T/F - The zero force position of the control column changes when using the pitch trim
False
T/F - When released from a venturi under pressure, Halon acts as a cooling agent
False
T/F - the bypass ratio is the ratio of inlet airflow to HP compressor flow
False
In a compressor, the rotor/stator alignment is ___
Rotor - Stator - Rotor - Stator
In a turbine, the rotor/stator alignment is ___
Stator - Rotor - Stator - Rotor
Select the statement which is untrue about thrust reverse interlocks
There is usually only 1 interlock system
What is the function of a fuel drain valve on a piston engine?
To detect particles and contamination that could damage the engine
In a gas turbine engine fuel system, why is the fuel heater typically installed before the filter?
To prevent the water in the fuel freezing and blocking the filter
T/F - Considering an impulse turbine, the pressure drops across the nozzle guide vanes
True
T/F - Considering impulse turbines, the pressure remains constant across the rotor blades ___
True
T/F - Considering the jet engine, the specific fuel consumption is inversely proportional to the pressure altitude, at constant TAS
True
T/F - The zero force position of the control column changes when using the aileron trim
True
T/F - the bypass ratio can be determined from the inlet air mass flow and the HP compressor mass flow
True
An electrically heated windscreen is manufactured from ___
a glass and polycarbonate laminate
The wing ice protection system currently used on most large jet transport aeroplanes is ___
a hot air system
One of the advantages of multiple spool jet engine designs is that ___
a smaller air starter driving only a single spool can be used
When a gas turbine engine is fitted with can-type combustion chambers ___
a total of only two igniters are usually fitted since the chambers are inter-connected
A modern APU is designed to provide power for ground starting of an engine. It also supplies both in the air, and on the ground ___
air conditioning and electrical services
The function of a vibrator in some gas turbine ignition systems is to provide ___
an AC voltage in order to facilitate transformation to a higher voltage
A hot start can be caused by ___
an early starter cutout, fuel mis-scheduling or strong tailwinds. The engine may spend considerable time at very low RPM, but should continue to accelerate. Turbine temp may exceed limitations
Power plant fire extinguishers are operated by ___
an electrically fired cartridge rupturing a seal in the head of the bottle
At constant RPM with a normally aspirated engine and a fixed propeller, as altitude increases, if the mixture is not leaned ___
both the density of air entering the carburettor and the fuel flow decrease
Compressor surge during gas turbine engine acceleration is prevented by ___
controlling the fuel flow
In the purse impulse type of turbine, the nozzle guide vanes form ___
convergent ducts
In a turbo compressor air conditioning system, the purpose of the heat exchangers is to ___
cool the bleed air in front and behind the compressor of the air cycle machine
Because of the connection in parallel of electrical equipment on an AC bus bar, isolation of individual equipments
decreases the bus bar current consumption
The oil supply to gas turbine engine bearings is maintained in the event of the main oil filter becoming clogged by ___
differential pressure opening the bypass valve of the main oil filter
Oxygen regulators used by the flight crew for most commercial jet aircraft are of the ___
diluter-demand type
The primary reason for a limitation being imposed on the temperature of gas flow in a gas turbine is to ___
ensure that the maximum acceptable temperature at the gas turbine blades is not exceeded
NiCad batteries need to be monitored during charging to avoid damage resulting from ___
excessive temperature caused by a decreasing voltage
One advantage of having there instead of two spools in some high bypass turbofan engines is that ___
fewer variable stator vanes and variable inlet guide vanes are required to prevent compressor stall at low rotor speeds
Turbine blade efficiency is increased by ___
fitting shrouds
During the ram recovery process in a gas turbine subsonic intake, the ___
flow velocity decreases
When excessively leaning the mixture for a better fuel economy, but still on the rich side of the peak EGT, the following engine parameters may exceed their normal operating ranges
high CHT and EGT
Excessive pressure in the cylinders of an engine equipped with a constant speed propeller, can be used by the combination of ___
high manifold pressure and low RPM
DC generators are connected ___
in parallel to provide maximum power
During a climb in the standard atmosphere with a constant MAP, RPM indications, and at a constant mixture setting, the power output of a piston engine:
increase
Bypass mass flow =
inlet mass flow - HP compressor mass flow
HP compressor mass flow =
inlet mass flow - bypass mass flow
When an emergency nitrogen bottled is used for the landing gear ___
it lowers the landing gear and the doors remain open
In transport aeroplanes overheat detection systems are typically installed in the ___
landing gear bays / wheel wells
In the pneumatic supply system of a modern transport aircraft, the air pressure is regulated. This pressure regulation occurs just before the manifold by the ___
low pressure bleed air valve
The functions of oil in an engine are ___
lubrication, cooling, cleaning, engine protection, hydraulic operation
The most unfavourable conditions for adequate inlet air flow of a turbofan engine are ___
maximum take off thrust, zero forward speed, and strong crosswind conditions
The air flow passages between adjacent axial compressor rotor blades are divergent, but the absolute exit velocity is higher than the absolute entry velocity of the rotor, because ___
part of the compressor work delivered to the ir is converted into kinetic energy
In an aircraft electrical system where AC generators are not paralleled, the bus tie breaker may allow ___
power to be supplied to the failed AC generator's bus bar
When the combustion gases pass through a turbine, the ___
pressure drops
A gas turbine engine is run at ground idle for a period of time prior to shutdown to ___
prevent seizure of the rotor blades in their seals
The purpose of a variable bypass valve, fitted between the LP and HP compressor of an axial flow compressor, is to:
prevent stall in the LP compressor
The range of movement of a control surface is limited by ___
primary stops at the surface
Assuming the same swept volume and no turbo charger, diesel engines compared to petrol ___
produce less maximum power output
When a turbo-prop aeroplane decelerates during the initial part of the landing roll, a constant speed propeller within the beta range
produces a negative thrust
The richness of a fuel air mixture ratio is the ___
real air mixture ratio relative to the theoretical ratio
A compressor stage always begins with a ___
rotor
Most high bypass turbofan engines are equipped with a cold exhaust reverse only in order to ___
save costs and mass at the expense of a reduction in available reverse thrust
In a gas turbine combustion chamber, ___
secondary air is required for cooling of the inner casing
According to EASA CS, the worst effect of a Minor Failure on the aeroplane could be ___
slight reduction in functional capabilities or safety margins
An electromagnetially activated and operated fuel valve is called an ___
solenoid valve
Phase and line current are equal at the ___
star
A turbine stage always begins with a ___
stator
Concerning the twisting force acting on a propeller blade:
the CTM twists the blade to a finer angle
The pilot may be prevented from retracting the gear whilst on the ground by ___
the electrical control system being routed through the weight on wheels switch
The high pressure fuel pumps are driven by ___
the engine
During takeoff, the fan in a high-bypass ratio turbofan engine produces
the greater part of the thrust
On small aircraft, the fuel content is typically measured by ___
the level of fuel in the tank
The compressor blades in a rotating gas turbine engine are held in position by ___
the mountings and the resultant of aerodynamic and centrifugal forces
During the compression stroke, ___
the volume decreases and the temperature increases
in a fire detection system with single loop continuous components, with no fault protection, the sensing element is crushed, but he inner core does not touch the outer casing:
there will be no effect
Engine oil reservoirs are sometimes located at the front of the engine:
to allow the hot oil to heat the air intake
The output of a turboprop engine is usually indicated by ___
torque
The power output of a piston engine can be calculated by ___
torque x RPM
In an air cycle machine the ___
turbine drives the compressor, which increases the temperature of the air, thus making the second heat exchanger more efficient
A fuel strainer, when fitted to a carburettor will be positioned ___
upstream of the needle valves
On which principle does the Rosemount Ice Detector operate on ___
vibration
A feeder fault on a direct current circuit results from a flux unbalance between the ___
voltage coil and series winding turn
In the case of a thermal anti icing system, an over temperature is typically indicated by ___
warning lights
The speed of a turbocharger is controlled by ___
waste gate position
A cable operated flight control system can be equipped with external gust locks ___
when fitted to the control surface, they will prevent movement of the control column if the controls are not fitted with servo tabs
Magnetic dip stick fuel system measurements can be done ___
with the indication from the indicator and using the documentation
In a gas turbine engine, the maximum gas temperature is attained ___
within the combustion chamber
