Practice Questions

Question 1

what does the cold section of an engine refer to?

Answer 1

the parts of the engine from the inlets up through the compressor and/or diffuser

Question 2

approximately how much thrust is produced by the ‘Fan’ of a turbofan engine

Answer 2

80%

Question 3

which of the following statements best describes the advantage, to an engine operator, of “modular engine construction”?

Answer 3

most modules can be replaced while the engine remains on the aircraft.

Question 4

How must fuel be delivered to the engine?

Answer 4

they must deliver the correct fuel quantity to the combustion chambers at the right condition for satisfactory combustion

Question 5

a FADEC’s electronic engine control (EEC) unit can control engine thrust in two modes. in the ‘alternate’ mode, the engine thrust is set by what?

Answer 5

The rotational speed, N1.

Question 6

with regards to the fuel nozzles during an engine start, which nozzle does the flow divider direct all flow through?

Answer 6

primary nozzles only

Question 7

On a twin spool turbofan, an “N2” indication relates to the speed of what

Answer 7

the high pressure rotor

Question 8

How might an engine failure or power loss be indicated on the manifold gauge?

Answer 8

An increase in manifold pressure to a value corresponding to the ambient air pressure at the altitude where the failure occurred

Question 8

Turbine engine gas temperature indicator thermocouples are located so that all temperature readings are relative to what?

Answer 8

The first stage turbine

Question 9

What is the purpose of a propeller tachometer

Answer 9

On a fixed pitch propeller to give the pilot an indication of engine power and RPM

Question 10

What is the purpose of a manifold pressure gauge?

Answer 10

Used to measure the pressure inside the induction system of an engine between the throttle and the engine cylinder combustion chamber

Question 11

what type of electrical starter is used on a gas turbine engine?

Answer 11

direct current (DC) electric motor

Question 12

prior to working on or around a reciprocating engine, what action should take place?

Answer 12

ignition switch should be off, fuel switches off and a warning sign placed on the ignition switch

Question 13

the type of magneto starting device that employs the magneto’s own primary and secondary windings is?

Answer 13

an induction vibrator

Question 14

what is the recommended time to wait following engine shutdown before working on the ignition system?

Answer 14

20 mins

Question 15

if the earthing switch lead became detached from the magneto while the engine were running the:

Answer 15

the engine could not be stopped

Question 16

what is the most common type of turbine starter used for engine starting?

Answer 16

Electric or air turbine start

Question 17

APU’S are generally on what type of engine?

Answer 17

Turboshaft

Question 18

a hydro/mechanical fuel control units “P3” pressure refers to what?

Answer 18

the engine compressor discharge pressure

Question 18

what are the advantages of modular engine construction

Answer 18

there is more flexibility when changes are made to individual engine parts

Question 18

what is the hot section of an engine refer too

Answer 18

the area past the compressors from the combustion chambers through to the exhaust

Question 19

two statements regards the EEC calculations and channels

Answer 19

each channel is an independent computer,
the processor does all the calculations

Question 19

what happens when there is a low oil pressure warning?

Answer 19

there is an accoustic warning in the flight deck

Question 20

how is the EEC cooled?

Answer 20

convection

Question 21

what pressure does an engine pressure EPR indicator or gauge compare to give a reading

Answer 21

engine turbine discharge pressure and inlet ram pressure

Question 21

the temperature is an engine operating limit and is used to monitor the mechanical integrity of what?

Answer 21

the Turbines

Question 21

what is the purpose of the turbine inside a “motorless mass flow” pressure transmitter

Answer 21

to drive the drum impeller

Question 22

what happens top the manifold air pressure (MAP) as throttle angle is increased?

Answer 22

MAP increases

Question 23

what indication is displayed if the N1 or N2 speed signal fails

Answer 23

BB broadband vibration

Question 23

within a typical electrical torque meter, the phase signal is provided to the comparator by a pick-up located on which of the following

Answer 23

the output shaft

Question 24

when is a magneto drop test carried out?

Answer 24

after maintenance on the ignition system and before every flight

Question 25

two method of providing mechanical propellor speed tacho generation

Answer 25

magnetic drag cup and fly-weight

Question 26

what is the most likely cause of accidental discharge from the igniter?

Answer 26

touch

Question 26

how many engineers do you need to open the air starter valve if it fails

Answer 26

two engineers one in the flight deck and one at the engine opening the valve

Question 27

what are the two types of electrical starting system used on a gas turbine engine aircraft

Answer 27

direct cranking electrical or starter generator systems

Question 27

what are the three main components of a typical air turbine starter?

Answer 27

the air turbine starter consists of an axial flow turbine, a reduction gear train and starter clutch mechanism

Question 27

impulse starters on magnetos operate on the principle of?

Answer 27

a spiral spring rotating the magneto