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