Turbine Engine Part 2 Flashcards
The process of combustion will result in an -
increase in temperature
the first considerable drop in speed occurs in the -
divergent flow of the diffuser
The beginning of the increase in velocity occurs in the -
combustion chamber
A flat-rated turbofan engine has a constant maximum rated thrust level:
Up to a specific OAT
Flat-rated jet engines are designed to provide constant maximum take-off thrust up to a certain level of:
ambient temperature
EPR measures the ratio of -
jet pipe pressure to compressor inlet pressure
EPR stands for -
engine pressure ratio
The location of the measured EGT is?
the turbine discharge stage
Temperature probes for the fuel system is located in the -
low pressure fuel lines
Turbine engine oil systems make use of what type of pump?
gear type
Oil coolers makes use of cold -
fuel from the tip of the tanks
About a twin-spool compressor:
The low pressure spools runs at a lower RPM than the high pressure spool
Which of the following statements regarding variable inlet guide vanes (VIGV’s) and variable stator vanes (VSV’s) on a high-bypass engine is correct?
VIGV’s are located in the front of the HP compressor and, together with the VSV’s control compressor airflow
The function of a vibrator in some gas turbine ignition systems is to provide:
A DC current to the transformer to facilitate the generation of a higher voltage to the igniters
In addition to providing ‘customer’ bleed for aeroplane systems, air may be bled from compressors of a turbofan engine to increase stall margin:
At low rotor speed
The rotor blades of an axial compressor of a gas turbine engine are often mounted on a disk or drum using a ‘loose fit’, as this:
Limits damage to the blades due to vibration
The take-off of a jet aeroplane may be performed with ‘reduced thrust’ in order to:
Reduce maintenance costs
A fuel flow transmitter is usually mounted in the fuel line between -
the fuel control unit and the fuel manifold.
Refer to Annex 021-4008. In flight, with the centre tank empty and APU operating, a fuel imbalance is detected (quantity in left main tank is less than in the right main tank). Rebalancing of the two tanks is:
Possible with cross-feed valves ‘OPEN’ and left main tank pumps ‘OFF’ and right main tank pumps ‘ON’.
Fuel flow information for gas turbine engines is:
Measured in the line between the fuel control unit and the engine burners
The fan in a high bypass ratio turbo-jet engine produces:
the greater part of the thrust.
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
The air inlet duct is design to supply the engine with adequate air at the highest possible -
pressure
Which of these statements about an impulse turbine are correct or incorrect? 1. The pressure remains constant across the nozzle guide vanes. 2. The pressure remains constant across the rotor blades.
1 is incorrect; 2 is correct
The effect of ram air on the operation of a gas turbine engine is:
An increase in the efficiency of the engine
The compressor surge effect during acceleration is prevented by the :
Fuel Control Unit (F.C.U.).
The most important oil system instrument indication during gas turbine engine start is:
Oil pressure
