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CPL Test Series
Question Bank
Questions for INDIGO JET ENGINES (955-1001)
Answer the following questions
Test Mode
Training Mode
1.
Using compressor bleed air to power systems
is limited to the phases of take-off and landing
decreases aircraft performance
has no influence on aircraft performance
increases aircraft performance
2.
The compressor surge effect during acceleration is prevented by the
variable setting type nozzle guide vanes
surge bleed valves
inlet guide vanes
Fuel Control Unit (F.C.U.).
3.
A reverse thrust door warning light on the flight deck instrument panel illuminates when
the reverser doors have moved to the reverse thrust position
the reverser doors are locked
the reverser doors are unlocked
reverse has been selected but the doors have remained locked
4.
In a fuel system, the oil to fuel heat exchanger allows
jet engine oil cooling through thermal exchange with fuel flowing from tanks.
fuel heating as required whenever fuel filter clogging is detected
fuel cooling so as to prevent vapour creation likely to unprime nozzles
automatic fuel heating by the engine oil so as to prevent icing in fuel filter.
5.
The primary purpose of the bleed valves fitted to axial flow compressors is to
reduce the likelihood of compressor stall
control the acceleration time of the engine.
enable an external air supply to spin up the compressor for engine starting
spill compressor air should the engine overspeed thus controlling the speed
6.
The Engine Pressure Ratio (EPR) is the ratio of
the total turbine inlet pressure to the total compressor inlet pressure
the total turbine inlet pressure to the total compressor outlet pressure
the total turbine outlet pressure to the total compressor outlet pressure
the total turbine outlet pressure to the total compressor inlet pressure
7.
In a turbo-jet, the purpose of the turbine is to
clear the burnt gases, the expansion of which provide the thrust
drive devices like pumps, regulator, generator
drive the compressor by using part of the energy from the exhaust gases
compress the air in order to provide a better charge of the combustion chamber
8.
In a gas turbine engine, compressor blades, which are not rigidly fixed in position when the engine is stationary, take up a rigid position when the engine is running due to
blade creep
the resultant of aerodynamic and centrifugal forces
thermal expansion
oil pressure
9.
The control of free turbine engines on turboprops, is accomplished by:- a propeller control lever used to select: 1 - propeller RPM 2 - turbine temperature 3 - turbine RPM- a fuel control lever used to select: 4 - propeller RPM 5 - torque 6 - turbine temperature The combination which regroups all of the correct statements is
02-04-05
01-05-06
01-03-05
03-04-06
10.
. Turbine blade stages may be classed as either ""impulse"" or ""reaction"". In an impulse blade section
the pressure rises across the nozzle guide vanes and remains constant across the rotor blades
the pressure drops across the nozzle guide vanes and remains constant across the rotor blades
the pressure remains constant across the nozzle guide vanes and drops across the rotor blades
the pressure remains constant across the nozzle guide vanes and rises constant across the rotor blades
11.
In very cold weather, the pilot notices during startup, a slightly higher than normal oil pressure.This higher pressure
is abnormal but does not require the engine to be shut down.
is normal, if it decreases after startup.
is abnormal and requires the engine to be shut down
requires an oil change
12.
The disadvantages of axial flow compressors compared to centrifugal flow compressors are :1 - expensive to manufacture2 - limited airflow3 - greater vulnerability to foreign object damage4 - limited compression ratioThe combination of correct answers is
03-Fev
03-Jan
04-Fev
02-Jan
13.
For a turbine engine, the term self-sustaining speed relates to the speed at which the engine
operates most efficiently in the cruise
will enable the generators to supply bus-bar voltage.
is designed to idle after starting
will run without any external assistance
14.
The purpose of the blow-in-doors at the air inlets is to
serve to increase the relative velocity at the first compressor stage
feed cooling air to the engine cowling
provide the engine with additional air at high power settings at cruising speed
provide the engine with additional air at high power settings and low air speeds
15.
A modern Auxiliary Power Unit (APU) is designed to provide power for ground starting of an engine. It also supplies both in the air (subject to certification limitations) and on the ground
air conditioning and thrust in the event of engine failure
air conditioning and electrical services (on the ground) electrical and hydraulic back-up services (in the air).
either air conditioning or electrical services, but never both at the same time.
air conditioning and electrical services
16.
The accessory units driven by the accessory gearbox of a turbo-jet engine are the :1. tacho-generator N12. tacho-generator N23. thrust reverser pneumatic motors4. AC generator and its Constant Speed Unit (CSD)5. oil pumps6. hydraulic pumps7. high pressure fuel pumpsThe combination regrouping all the correct statements is
4, 5, 6, 7.
2, 3, 4, 5, 6, 7.
2, 4, 5, 6.
1, 4, 5, 6, 7.
17.
A stage in an axial compressor
has a compression ration in the order of 0.8
is made of a rotor disc followed by a row of stator blades
is made of row of stator blades followed by a rotor disc
has a compression ratio in the order of 2.1
18.
The use of igniters is necessary on a turbo-jet:1 - throughout the operating range of the engine2 - for accelerations3 - for ground starts4 - for in-flight relights5 - during turbulence in flight6 - under heavy precipitation or in icing conditionsThe combination which regroups all of the correct statements is
3 - 4 - 5 - 6
2002-03-04
3
1
19.
Concerning the centrifugal compressor, the compressor diffuser is a device in which the
velocity rises and pressure falls
pressure rises and velocity falls
pressure rises at a constant velocity
velocity, pressure and temperature rise
20.
If air is tapped from a gas turbine HP compressor, the effect on the engine pressure ratio (EPR) and the exhaust gas temperature (EGT) is that
both EPR and EGT decrease
EPR remains constant and EGT increases
EPR decreases and EGT increases
EPR decreases and EGT remains constant
21.
An impulse turbine is a turbine in which the expansion takes place
fully in the rotor
fully in the stator
in the stator and in the rotor
in order to produce a degree of jet propulsion < 1/2.
22.
Use the appendix to answer this question)The gas turbine illustrated is of the following type
single shaft turbine and centrifugal compressor
free turbine and centrifugal compressor
free turbine and axial compressor
single shaft turbine and axial compressor
23.
The pressure usually produced by the Boost Pumps (BP) of the fuel supply system is within the following range
3000 to 5000 psi
20 to 50 psi
300 to 500 psi
5 to 10 psi
24.
The fan in a high by-pass ratio turbo-jet engine produces
half the thrust
none of the thrust
the greater part of the thrust
the lesser part of the thrust
25.
The reason for having a low pressure fuel-cooled oil cooler in a recirculatory type oil system is to
cool the oil and heat the fuel
heat the fuel only.
cool both the oil and the fuel.
cool the oil only.
26.
The purpose of the barometric correction in a fuel controller is to
maintain the correct weight fuel to air ratio when the altitude increases
increase the fuel-to-air ratio when altitude increases
maintain a constant fuel metering whatever the altitude
reduce the fuel-to-air ratio when altitude increases
27.
When the combustion gases pass through a turbine the
temperature increases
pressure drops
velocity decreases
pressure rises
28.
In a free turbine engine
there is no mechanical connection between the compressor and the power output shaft
the air enters the compressor via the input turbine.
the compressor and power output shaft are mechanically connected.
its shaft may be connected to either a compressor or another turbine.
29.
In the stator of a turbine, the speed V and static pressure Ps vary as follows
V decreases, Ps increases
V increases, Ps decreases
V increases, Ps increases
V decreases, Ps decreases
30.
In a single spool gas turbine engine, the compressor rpm is
less than turbine rpm
independent of turbine rpm
the same as turbine rpm
greater than turbine rpm.
31.
The primary reason for a limitation being imposed on the temperature of gas flow is to
prevent damage to the jet pipe from overheating
prevent overheating and subsequent creep of the nozzle guide vanes
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
32.
In addition to fire detention/protection, most auxiliary power units (APUs) have automatic controls for stating, stopping and maintaining operation within safe limits. These controls provide correct sequencing of the starting cycle as well as protection against
high turbine gas temperature (TGT), overspeed, loss of oil pressure and high oil temperature
overspeed and high oil temperature only.
high TGT and loss of oil pressure only
high TGT only.
33.
At constant fuel flow, if engine compressor air is bled off for engine anti-icing or a similar system, the turbine temperature
will be unchanged
will fall.
will rise
may rise or fall depending on which stage of the compressor is used for the bleed and the rpm of the engine at the moment of selection.
34.
For a fan jet engine, the by-pass ratio is the
fuelflow mass divided by the internal airflow mass
internal airflow mass divided by the fuelflow mass
internal airflow mass divided by the external airflow mass
external airflow mass divided by the internal airflow mass
35.
An impulse coupling does not function at such speeds above those encountered in starting. Its engaging pawls are prevented from operating at higher speeds by
a coil spring
electro-magnetic action of operating magneto.
engine oil pressure
centrifugal force
36.
The thrust of a turbo-jet, at the selection of full power :1 - equals the product of the exhaust gas mass flow and the exhaust gas velocity2 - is obtained by pressure of the exhaust gas on the ambient air3 - is equivalent to zero mechanical power since the aeroplane is not moving4 - is independant of the outside air temperatureThe combination which regroups all of the correct statements is
4
03-Jan
03-Fev
02-Jan
37.
Consider a jet engine whose control is based on the Engine Pressure Ratio (EPR):1. with a constant EPR, the thrust decreases when the altitude increases2. with a constant EPR, the thrust is independent of the Mach number3. At same environmental conditions, a given EPR setting maintains the thrust irrespective of engine wear due to ageing.4. the EPR is determined by the impact pressure difference between the turbine outlet and the compressor inlet5. on take-off, in the event of icing not detected by the crew, the indicated EPR is lower than the real EPRThe combination regrouping all the correct statements is
2, 3, 4.
3, 4, 5.
1, 3.
1, 5.
38.
The fuel temperature, at which, under standard conditions, the vapour ignites in contact with a flame and extinguishs immediately, is the
flash point
combustion point
self ignition point
fire point
39.
A ""fan"" stage of a ducted-fan turbine engine is driven by
the low pressure turbine
the high pressure turbine
airflow drawn across it by the high pressure compressor
the high pressure compressor through reduction gearing.
40.
In a gas turbine engine, the maximum gas temperature is attained
across the turbine
within the combustion chamber
in the cooling airflow around the flame tube.
at the entry to the exhaust unit.
41.
In a gas turbine engine, the power changes are normally made by controlling the amount of
air entering the compressor and fuel entering the combustion chambers
fuel supplied
air leaving the compressor by the opening or closing of bleed valves
air entering the compressor
42.
A ""hung start"" is the failure of an engine to accelerate to its normal idle speed. It may be caused by
the starter cutting out early in the starting sequence before the engine has accelerated to the required rpm for ignition
compressor surging
an attempt to ignite the fuel before the engine has been accelerated sufficiently by the starter
failure of the fuel to ignite in the starting sequence after the engine has been accelerated to the required rpm by the starter
43.
On the ground, the Auxiliary Power Unit (APU) can be substituted for the
ground power unit, the starting system, the air conditioning unit.
ground power unit
ground power unit, the starting system
ground power unit, the air conditioning unit
44.
An engine pressure ratio (EPR) gauge reading normally shows the ratio of
jet pipe pressure to combustion chamber pressure
jet pipe pressure to compressor inlet pressure
compressor outlet pressure to compressor inlet pressure
combustion chamber pressure to compressor inlet pressure
45.
In the axial flow compressor of a turbo-jet engine, the flow duct is tapered. Its shape is calculated so as to
reduce the axial speed in cruising flight
reduce the axial speed, whatever the engine rating
maintain a constant axial speed whatever the engine rating
maintain a constant axial speed in cruising flight
46.
In a compressor stage of a jet engine, the sequence is
rotor - stator
stator - rotor
rotor - rotor - stator
stator - stator - rotor
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