ATPL Systems Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
TOT Turbine outlet temperature
TIT Turbine inlet temp
ITT Inter turbine temp
TGT Turbine gas temp
EGT Exhaust Gas Temp
JPT Jet Pipe Temperature
What does the jet pipe do? Carries exhaust gas from the turbine
to the propelling nozzle
What does The negative Prevents the propeller from driving
torque signal systems (NTS) the engine during in flight conditions
do?
What does safety coupling do? Decouples (disconnects) the power
section from the reduction gear
assembly when negative torque
exceeds the setting of safety
coupling
,Using wide cut fuel (AVGAS) - decreased range-poor altitude
instead of Kerosene (AVTUR) performance-over temperature or
in a turbine engine may result over speeding
in....?
What is a hot start? High fuel flow, low RPM Temperature
increases beyond max
What is a wet start? Ignition problem No light off
What is a hung start? Not enough starter power to reach
self-sustaining speed
Specific fuel consumption SPC = Fuel Flow (units/hr)/thrust
equation produced (units)
What will cause specific fuel Increase to ambient temperature, a
consumption (SFC) to decrease in compressor pressure or
increase? operation outside the design RPM
range
What is Ram effect and Ram As airspeed decreases thrust
ratio? decreases slightly The Ram effect
restore thrust by compressing air
Ram ratio = total pressure to static
pressure at engine
Effect of weight on Optimum The lighter the aircraft weight the
flight level and optimum speed higher the optimum level and the
lower the optimum speed
You would expect to find the D
highest gas velocity in a
, turbojet engine-A) at the face
of the compressor B) leaving
the diffuser C) entering the
turbine D) at the end of the
exhaust nozzle
The purpose of a diffuser in a B
gas turbine engine is to-A)
lower pressure and lower
temperature B) raise pressure
and lower velocity C) raise
pressure and raise velocity D)
raise density and lower
temperature
The correct statement B
regarding the variations of
MSL full throttle thrust of a jet
engine is-A) thrust increases
as air temperature increases
B) thrust decreases as air
temperature increases C)
thrust increases as humidity
increases D) thrust increases
as air pressure decreases
You would expect to find the A
highest gas pressure in a
turbojet engine-A) in the
diffuser B) at the beginning of
the jet pipe C) at the last stage
of the turbine D) at the inlet of
the compressor
Answers with Verified Solutions | Latest
Updated 2026
TOT Turbine outlet temperature
TIT Turbine inlet temp
ITT Inter turbine temp
TGT Turbine gas temp
EGT Exhaust Gas Temp
JPT Jet Pipe Temperature
What does the jet pipe do? Carries exhaust gas from the turbine
to the propelling nozzle
What does The negative Prevents the propeller from driving
torque signal systems (NTS) the engine during in flight conditions
do?
What does safety coupling do? Decouples (disconnects) the power
section from the reduction gear
assembly when negative torque
exceeds the setting of safety
coupling
,Using wide cut fuel (AVGAS) - decreased range-poor altitude
instead of Kerosene (AVTUR) performance-over temperature or
in a turbine engine may result over speeding
in....?
What is a hot start? High fuel flow, low RPM Temperature
increases beyond max
What is a wet start? Ignition problem No light off
What is a hung start? Not enough starter power to reach
self-sustaining speed
Specific fuel consumption SPC = Fuel Flow (units/hr)/thrust
equation produced (units)
What will cause specific fuel Increase to ambient temperature, a
consumption (SFC) to decrease in compressor pressure or
increase? operation outside the design RPM
range
What is Ram effect and Ram As airspeed decreases thrust
ratio? decreases slightly The Ram effect
restore thrust by compressing air
Ram ratio = total pressure to static
pressure at engine
Effect of weight on Optimum The lighter the aircraft weight the
flight level and optimum speed higher the optimum level and the
lower the optimum speed
You would expect to find the D
highest gas velocity in a
, turbojet engine-A) at the face
of the compressor B) leaving
the diffuser C) entering the
turbine D) at the end of the
exhaust nozzle
The purpose of a diffuser in a B
gas turbine engine is to-A)
lower pressure and lower
temperature B) raise pressure
and lower velocity C) raise
pressure and raise velocity D)
raise density and lower
temperature
The correct statement B
regarding the variations of
MSL full throttle thrust of a jet
engine is-A) thrust increases
as air temperature increases
B) thrust decreases as air
temperature increases C)
thrust increases as humidity
increases D) thrust increases
as air pressure decreases
You would expect to find the A
highest gas pressure in a
turbojet engine-A) in the
diffuser B) at the beginning of
the jet pipe C) at the last stage
of the turbine D) at the inlet of
the compressor
