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WorksheetsAGK MOCK 2
Total questions: 80
Worksheet time: 51mins
Given:
p0 = static ambient pressure
t0 = static ambient temperature
m = air mass flow
Vv = True Air Speed
Vj = jet efflux (exhaust) velocity
pj = jet efflux (exhaust)
static pressure tj = jet efflux (exhaust)
static temperature A = exhaust cross-sectional area
The thrust T of a jet engine is:
T = m(Vj -Vv ) + A(pj – p0).
T = m(Vv -Vj ) + A(pj – p0).
T = m(Vj – Vv ) + A(tj – t0).
T = m(Vv -Vj ) + A(t j- t0).
On most large aeroplanes, the main source of braking power is derived from:
pressure to the rudder pedals.
the electrical system.
the hydraulic system.
bleed air pressure.
How is an auxiliary gearbox lubricated?
Lubrication is unnecessary, but it is cooled with fan air.
With oil.
By means of high-pressure fuel.
With grease.
The camshaft of a piston engine rotates at:
twice the speed of the crankshaft.
the same speed as the crankshaft.
four times the speed of the crankshaft.
half the speed of the crankshaft.
In a resistive single-loop continuous fire detection system without fault protection, if the outer capillary tube is inadvertently crushed but the inner core is not in contact with the outer casing..
there will be no effect on the system
the main engine fire extinguisher is automatically activated.
the fire alarm is triggered.
the power supply is cut off automatically.
The essential difference between aircraft AC alternators and DC generators (dynamos) is that the:
induced (output) windings of the alternators are fixed (stator), and the dynamos have a fixed inductor (field) coil.
alternators supply all of the output current through the commutators and brush assemblies.
the alternators generate much less power than DC generators.
induced windings of the alternators are rotating (rotor), and the dynamos have a rotary inductor coil.
The frequency of the current provided by an alternator depends on..
its phase balance.
the strength of the excitation current.
its load.
its rotation speed.
The so-called "hot buses" or "direct buses" are:
providing an alternative current.
automatically connected to the battery if generators have failed.
directly connected to the battery.
kept in operating conditions by an electrical resistance in the case of energy failure.
What is the function of hydraulic valves in fully powered control systems?
They decrease the control force generated by the cables or pushrods
They act on the actuator of the control surface.
They directly cause a movement of the control surface.
They only provide the pilot with an “artificial feel” feedback.
The output voltage of a generator is controlled by:
varying the length of wire in the armature windings.
varying the speed of the engine.
varying the field strength.
the reverse current relay circuit breaker.
Jet engine total efficiency indicates the efficiency at which:
potential energy in the jet is transformed into propulsive energy.
the increase of jet kinetic energy is transformed into propulsive energy.
chemical power in the fuel is transformed into propulsive power (T x V).
chemical power in the fuel is transformed into an increase of jet kinetic energy per second.
When all outflow valves close during cruise flight with air-conditioning packs ON, the..
skin of the cabin would be overstressed.
cabin pressure would become equal to the ambient pressure.
air supply would automatically be stopped.
pressure differential would go to the maximum value.
Hydraulic fluids should have the following characteristics:
1. thermal stability
2. anti-corrosive
3. high flash-point
4. high compressibility
5. high volatility
The combination that regroups all of the correct statements is:
1, 2, 5
1, 2, 3
2, 3, 4
1, 4, 5
One of the functions of a gas turbine engine subsonic intake is to:
increase airflow velocity.
increase total pressure.
decrease static temperature.
decrease airflow velocity.
In a gas turbine engine, the maximum gas temperature is attained:
at the turbine entrance.
within the combustion chamber.
in the cooling airflow around the flame tube.
at the entry to the exhaust unit.
The "DILUTE" position of a cockpit oxygen mask should not be used when…
there is smoke in the cockpit.
chemical oxygen generators are used.
the oxygen bottle is almost empty.
oxygen is used in the cabin.
The highest load on the torsion link in a bogie gear is:
when gear is selected down.
when braking with an inoperative anti-skid system
whilst turning on the ground with a small radius.
on touch down with a strong crosswind
The presence of icing conditions, in-flight, on an aircraft using an advisory ice detection system..
provides the flight crew with an ice warning annunciation and automatically activates the aircraft`s de-icing system.
requires the flight crew to monitor for icing using a primary method as directed in the AFM.
requires the flight crew to immediately activate the aircraft`s primary ice protection system.
provides the flight crew with an ice warning annunciation and automatically activates the aircraft`s anti-icing system.
A hydraulic accumulator is pre-charged with nitrogen to 1000 psi. The hydraulic system is then pressurised to its operating pressure of 3000 psi.What is the indicated pressure on the nitrogen side of the accumulator?
2000 psi
3000 psi
4000 psi
1000 psi
In a single spool gas turbine engine, the compressor rpm is:
the same as turbine rpm.
less than turbine rpm.
independent of turbine rpm.
greater than turbine rpm.
According to CS 25, the worst effect of a hazardous failure on an aeroplane is..
a large reduction in functional capabilities or safety margins.
hull loss.
a slight reduction in functional capabilities or safety margins.
a significant reduction in functional capabilities or safety margins.
Labyrinth seals in the lubrication system of a gas turbine engine are designed to provide a seal that is:
not completely tight, allowing some movement between rotating and static parts.
completely tight, allowing some axial movement between rotating and static parts.
completely tight, allowing no movement between rotating and static parts.
not completely tight, allowing only some radial movement between rotating and static parts.
Compressor surge in a gas turbine engine may be prevented by means of:
fixed inlet guide vanes.
a variable metering orifice.
a pressure drop control orifice.
bleed valves.
Which of these statements is correct about a flight crew oxygen mask?
Below a certain altitude the oxygen mask switches automatically to “constant flow”
In the position “100%” oxygen is always supplied with some overpressure.
When selected to the position “EMERGENCY” oxygen is always supplied with some overpressure.
In the position “DILUTE” oxygen supply is from a special bottle containing diluted oxygen.
Thermal plugs are installed in..
wheel hubs.
cargo compartments.
cabin windows.
fire warning systems.
The reason for fitting thermal plugs to aeroplane wheels is that they..
release air from the tyre in the event of overpressure due to over-inflation.
prevent heat transfer from the brake disks to the tyres.
prevent the brakes from overheating.
allow a controlled deflation of the tyre in the event of overheating.
A non-cantilever wing is..
a wing supported by struts.
a wing planform other than rectangular.
a high wing configuration.
a low wing configuration.
Which statement is correct for a gas turbine engine with constant speed propeller and free power turbine, when the power setting is increased?
I. The propeller blade angle decreases.
II. The free power turbine speed increases.
I is correct, II is correct.
I is incorrect, II is incorrect.
I is correct, II is incorrect.
I is incorrect, II is correct.
Consider a gas turbine engine. The diffuser of a centrifugal-flow compressor stage creates a
convergent area at the impeller inlet to increase both the air velocity and the air pressure
divergent area at the impeller exit to reduce the air velocity and increase the air pressure.
convergent area at the impeller exit to reduce the air velocity and increase the air pressure.
divergent area at the impeller exit to increase both the air velocity and the air pressure.
A smoke hood is a device covering:
only the nose and the mouth and with an oxygen/air mix.
the whole head and with an oxygen flow only on demand.
the whole head and with a continuous oxygen flow.
only the nose and the mouth and with a continuous oxygen flow.
A stage in an axial compressor..
consists of a rotor disc followed by a ring of stator blades.
has a compression ratio in the order of 0.8:1 .
consists of a ring of stator blades followed by a rotor disc.
has a compression ratio in the order of 2.1:1 .
The diagram shows a typical hydraulic system. Assuming hydraulic pressure throughout and no internal leakage, how will the piston move? The piston..
moves to the right due to equal pressure acting on differential areas.
moves to the left due to pressure acting on differential areas.
is free to move in response to external forces since pressures are equal.
will not move as it is hydraulically locked.
To enhance brake life in relation to brake wear, it is recommended
for steel brakes to use a single, firm brake application during taxi.
for carbon brakes to use a large number of small brake applications during taxi.
for steel brakes to use a large number of small brake applications during taxi.
for both carbon and steel brakes to use differential braking to reduce brake temperatures.
Pressurising a fuselage causes the following load in the skin:
compression.
bending
torsion.
tension.
The fan stage of a ducted-fan turbine engine is driven by the..
low-pressure turbine.
high-pressure compressor.
high-pressure turbine.
high-pressure compressor through reduction gearing.
A flight control surface actuator is said to be "irreversible" when:
the flight control system has an alternate means of control in case of a control jam.
there is no feedback to the pilot`s controls of the aerodynamic forces acting on the control surface.
there is a need to lock the flight controls on the ground.
the pilot does not feel any force when moving that control surface in flight.
On most transport aircraft, flight deck windows are protected against icing by:
rain repellent systems.
anti-icing fluid.
vinyl coating.
electrical heating.
Pascal`s Law states that if a fluid in a confined space is pressurised by an external force, the fluid pressure will be sensed.
greater near the walls in the fluid.
greater at higher levels in the fluid.
greater at lower levels in the fluid.
equally throughout the fluid.
In flight, the AC ESS BUS can be fed by the EMER GEN, when: (NB: all contactors not mentioned are assumed to remain open)
C4.1 is closed.
C4.1 and C5.2 are closed, via the DC ESS BUS and the static inverter.
C4.1 and C5.2 are closed, via the DC BAT BUS and the static inverter.
C4.1 is closed, via the static inverter.
In case of failure of the TRU 1..
AC BUS 1 can be restored through AC X-TIE function.
DC BUS 1 can be restored through DC X-TIE function.
DC BUS 1 can be restored through the DC ESS BUS.
AC BUS 1 can be restored through AC ESS BUS.
Which statement about structural design principles is correct?
Fail-safe structure is preferred to damage tolerant structure as they are lighter due to not requiring extra structural members.
Safe life requires a structure to have a maximum stated design life within which no catastrophic damage will occur.
Fail-safe implies the structure will fail when one component fails.
Safe life requires a structure to have a minimum stated design life within which no catastrophic damage will occur.
The bleed-air pressure gauge on the flight deck shows the bleed-air pressure relative to..
cabin pressure.
total pressure.
a vacuum.
atmospheric pressure.
Elastic Deformation in relation to aircraft structures is a shape change that..
is temporary and is reversed after the force is removed.
is permanent and is caused by bending loads.
will cause visible cracks to appear in the aircraft`s skin.
will cause irreversible buckling of the aircraft`s skin.
Which of these statements about an auto-brake system (ABS) is correct?
For a given touchdown speed (GS) on a dry runway without use of reverse thrust the stopping distance is solely dependent on the selected ABS setting and independent of weight.
Not arming the auto-brake system will generate a take-off warning during take-off.
Without pilot interference an auto-brake system continues to operate until standstill.
An armed auto-brake system will always try to achieve the selected deceleration level directly after main wheel touchdown.
During the test sequence of the Fire Detection System, the "TEST" light does not illuminate and the pilot has no other visual confirmation. Which of the following statements is correct?
As long as the aural indication sounds, the system is operating properly, because the aural cue has a higher priority.
This is normal. Only if the “FAIL” light illuminates during the test sequence is there is a problem.
The circuit is not grounded because of a break in the wire between the detectors, therefore the light(s) will not illuminate.
This is normal. The light(s)remain(s) off because there is no real fire.
Which of these statements about composite and metal structures are correct or incorrect?
I. In composite structural components, the tensile strength is the same in all directions independent of the direction of the fibres.
II. Composite materials enable manufacturing structures with a higher strength-to-weight ratio than metal structures.
I is correct, II is correct.
I is incorrect, II is correct.
I is incorrect, II is incorrect.
I is correct, II is incorrect.
What is the correct sequence during the in-flight wind-milling start of a turbine engine?
Rotation, ignition, fuel.
Ignition, rotation, fuel.
Starter, rotation, fuel, ignition.
Starter, rotation, ignition, fuel.
An engine fire in a large transport aeroplane is indicated by a(n):
rise in EGT.
aural alert only.
visual warning only.
visual warning and an aural alert.
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 within the combustion chamber is not exceeded.
ensure that the maximum acceptable temperature at the turbine blades is not exceeded.
prevent overheating and subsequent creep of the nozzle guide vanes.
prevent damage to the jet pipe from overheating.
The purpose of a stand (stack) pipe on a supply line inside the reservoir of a typical hydraulic system is to..
prevent aerated fluid from entering the hydraulic system.
prevent contaminants from entering the hydraulic system.
ensure hydraulic fluid supply for emergency hydraulic system operation.
ensure hydraulic fluid supply to system pumps during normal operation.
The number in the annex that shows the retraction actuator is
number 3.
number 4
number 2
number 1
During level cruising flight, an aeroplane experiences a malfunction of the pressure controller. If the cabin vertical speed indicator reads 200 ft/min rate of descent..
the aircraft has to climb to a higher flight level in order to reduce the cabin altitude to its initial value.
the differential pressure will rise to its maximum value, thus causing the safety relief valves to open.
the crew has to intermittently cut off the incoming air flow in order to maintain a zero cabin altitude.
a descent must be initiated to prevent the oxygen masks dropping when the cabin altitude reaches 14000 ft.
The advantages of a chemical oxygen source compared with a gaseous one for the passenger cabin are:
1. easier maintenance.
2. greater capacity.
3. reduced risk of explosion.
The combination that regroups all of the correct statements is:
1, 2.
1, 3.
1, 2, 3.
2, 3.
When detonation is recognised in a piston engine, the correct procedure is to:
increase manifold pressure and fully enrich the mixture.
reduce manifold pressure and lean the mixture.
reduce manifold pressure and fully enrich the mixture.
crease manifold pressure and lean the mixture.
The pack cooling fan provides ..
cooling air to the pre-cooler.
cooling air to the primary and secondary heat exchanger during cruise only.
cooling air to the primary and secondary heat exchanger during slow flight and ground operation.
air to the recirculation fans.
A conductor is positioned in a magnetic field non-parallel to the magnetic field lines. If a current is passed through this conductor:
a Lorentz force is induced in the conductor.
the field will collapse.
the current will stop.
there will be no effect on the conductor.
During a climb in a standard atmosphere with constant MAP and RPM indications and at a constant mixture setting, the power output of a piston engine:
decreases.
stays constant.
increases
only stays constant if the propeller lever is pushed.
In a normally aspirated piston engine, when altitude increases, the mixture must be adjusted because there is..
an increase of air density resulting in too rich a mixture.
an increase of air density resulting in too lean a mixture.
a decrease in air density resulting in too rich a mixture.
a decrease of air density resulting in too lean a mixture.
What is the purpose of first-aid portable oxygen bottles?
They are used by the crew in order to prevent fatigue.
They are only to be used in case of a sudden loss in aeroplane pressurisation, for pressurised aeroplanes operated at pressure altitudes of 10000 ft and above.
They are used for passengers who, for physiological reasons, might require oxygen following a cabin depressurisation.
They must be used if an onboard fire needs to be extinguished.
Consider a piston-engine aircraft with a constant speed propeller. At cruising altitude when less power is required, engine power is
reduced by lowering the manifold pressure and increasing the blade angle, to decrease RPM.
reduced by lowering the manifold pressure while RPM and blade angle are maintained.
reduced by lowering the manifold pressure and decreasing the blade angle, to decrease RPM.
maintained but the blade angle is decreased, to decrease RPM.
The failure of an anti-skid system:
does not increase the braking distance during a rejected take-off, provided the pilot applies maximum braking.
increases the minimum braking distance on a dry runway only.
increases the minimum braking distance on a slippery runway only.
always increases the minimum braking distance irrespective of runway condition.
Select the option that best describes "nose-wheel shimmy"
An oscillatory longitudinal movement of the nose-wheel about the lateral axis of the aircraft caused by the landing gear being lowered prior to landing or retracted after take-off.
An oscillatory lateral movement of the nose-wheel about the longitudinal axis of the aircraft caused by the landing gear being lowered prior to landing or retracted after take-off.
An oscillatory lateral movement of the nose-wheel about the longitudinal axis of the aircraft when the nose wheel is in contact with the runway during the take-off or landing run.
An oscillatory longitudinal movement of the nose-wheel about the lateral axis of the aircraft when the nose wheel is in contact with the runway during the take-off or landing run.
The reason for having a low pressure fuel-cooled oil cooler in a recirculatory type oil system is to:
cool the oil only.
cool both the oil and the fuel.
cool the oil and heat the fuel.
heat the fuel only.
Vibration sensors are used in a gas turbine engine to indicate:
bearing problems only.
that tip clearance of turbine blades has decreased below a minimum value.
that there is too much free movement of the engine strut (pylon)
imbalance of one or both of the spools.
Which part of the main landing gear is shown by the number 3?
Retraction actuator.
Side stay/strut.
Torsion link.
Main leg oleo strut.
Activating the engine fire handle will
close the engine bleed-air valve(s).
ensure that the engine bleed-air valve(s) stay at their current position.
modulate the engine bleed-air valve(s) towards the high-flow position.
modulate the engine bleed-air valve(s)towards the low-flow position.
In a gas turbine engine lubrication system fitted with an oil to fuel heat exchanger the:
fuel is cooled to prevent vapour locking interrupting the fuel supply to the nozzles.
oil is heated through thermal exchange with the fuel.
fuel is heated as required whenever fuel filter clogging is detected.
oil is cooled through thermal exchange with the fuel.
The command to discharge a main engine fire extinguisher is activated..
automatically when a fire is detected.
manually by the flight crew.
manually when a high oil temperature is indicated.
automatically when an overheat is detected.
Fuel tanks are fitted with baffles to..
prevent spanwise fuel motion during constant sideslip.
damp spanwise fuel motion in the tanks.
assist in cooling the fuel.
remove air bubbles from the fuel.
Both gas turbine and piston engines use a cycle made up of induction, compression, combustion and exhaust phases. Which of these statements about a gas turbine are correct?
1. The process in a gas turbine engine is continuous
2. Theoretically the combustion occurs at constant volume.
Both 1 and 2 are incorrect.
1 is correct, 2 is incorrect.
Both 1 and 2 are correct.
1 is incorrect, 2 is correct.
The power of a normally aspirated piston engine decreases during a climb with a constant power lever setting because of the..
increasing air density.
increasing engine temperature.
decreasing air density.
decreasing outside air temperature.
An aeroplane equipped with irreversible flight controls:
may be flown without a separate gust lock system.
may be flown without an artificial feel system.
may be equipped with simple spring type feel units on all flight controls.
must have a mechanical back-up control system.
The two deformation modes that cause wing flutter are:
bending and elongation.
torsion and shearing.
shearing and elongation.
torsion and bending.
The cabin altitude of an aeroplane is 6000 ft. Following a requirement to reduce the differential pressure to 7 psi,what is the maximum aeroplane pressure altitude that can be maintained in order to maintain the same cabin altitude?
23000 ft
19000 ft
32000 ft
28000 ft
The engine type represented in the drawing is a:
twin-spool turbojet.
triple-spool turbofan.
single spool turbofan.
twin-spool turbofan.
To reverse the direction of rotation of a shunt-wound DC electric motor, it is necessary to..
connect a phase-shift capacitor to the field circuit.
reverse the polarity of either the stator or the rotor.
do nothing because a DC motor cannot be reversed.
reverse the polarity of the motor connections.
Connecting two 12 volt 40 ampere-hour capacity batteries in parallel will result in a total voltage and capacity respectively of:
12 volts, 40 ampere-hours.
24 volts, 80 ampere-hours.
12 volts, 80 ampere-hours.
24 volts, 40 ampere-hours.
In aircraft with AC generators as primary source of electrical power DC power is obtained by:
AC-DC regulators
portable batteries
transformer rectifier units.
rectifiers and voltage reducing resistors
The function of a NOT logic gate within a circuit is to..
process only high voltage input signals.
invert the input signal such that the output is always of the opposite state.
accept the input signal only if it is AC.
ensure the output signal is of the same state as the input signal.
The main purpose of a Constant Speed Drive unit is to..
mechanically protect the alternator drive shaft during coupling.
provide voltage regulation.
achieve reactive load sharing.
maintain a constant frequency.
