Q12-8.
Which of the following components is
PNEUMATIC POWER GAS TURBINE
installed on the gas turbine engine to
ENGINE, MODEL GTCP-100
prevent accumulation of unburned fuel in
the turbine plenum?
LEARNING OBJECTIVES: Identify the
1.
A drain check valve
components of GTCP-100 electrical, fuel,
2.
An overflow valve
bleed air, and lubrication systems.
3.
A pressure valve
4.
A discharge valve
The GTCP-100 gas turbine engine (fig. 12-11) is a
Q12-9.
The oil of a gas turbine compressor is
compact and essentially self-sufficient source of
cooled by what means?
mechanical and pneumatic power. Either form of
power may be used independently of the other, or both
1.
By using the intake air as a cooling
agent
may be used simultaneously. Mechanical power is
2. By using a fan to circulate air over the
available as shaft power at the takeoff pad located on
oil tank
the accessory housing. Pneumatic power is available as
3. By cooling it with a radiator
clean, compressed air delivered through a modulating
4. By passing it through an oil cooler
valve located on the turbine plenum. An external
when the oil gets hot
source of fuel, oil, and electrical power for starting and
control is provided by the enclosure and turbine
Q12-10. The generator on a gas turbine compressor
control panel.
is driven by what means?
1. By a belt and pulley on the front of the
COMPONENTS OF THE ENGINE
engine
2. By the accessory drive gear section of
As with the GTC-85, the GTCP-100 engine is
the engine
composed of three main sections: the accessory drive
3. By an electric motor located on the
section, located at the front; the turbine section,
enclosure
located at the rear; and the compressor section, located
4. By a pneumatic motor driven by
in the middle area (fig. 12-12). The engine also
compressed air from the engine
includes the same main systems that are incorporated
Q12-11. Which of the following is NOT a switch
into the GTC-85 engine. Individual accessories
located in the centrifugal switch?
comprise the remaining parts of the engine.
1.
The 10-percent switch
Airflow through the GTCP-100 engine is virtually
2.
The 35-percent switch
the same as that of the GTC-85 engine. Ambient air
3.
The 95-percent switch
enters the engine through the screened compressor
4.
The 110-percent switch
inlet plenum and is compressed by the two stages of the
compressor section (fig. 12-13). This compressed air is
Q12-12. When is the acceleration stabilizer solenoid
directed into the turbine plenum, where a portion may
energized?
be diverted for pneumatic power uses. The balance is
1. When the engine is in a loaded
directed into the six combustion chambers where it is
condition
mixed with fuel. The mixture is ignited by an igniter
2. When the engine is between 35 percent
plug, and continuing combustion adds heat and
to 100 percent of rated speed
velocity. The gases of combustion are directed into the
3. When the engine is between 0 percent
vanes of the turbine wheels to provide power for the
and 35 percent of rated speed
engine. Spent gases are exhausted through a duct
4. When the engine is in a 100-percent
assembly at the rear of the engine. Power produced at
unloaded condition
the turbine wheel drives the compressor and provides
Q12-13. Which of the following components removes
the drive for the accessory section through a series of
the ground circuit from the starter and
drive shafts and gear trains.
ignition holding relay?
1.
The oil-pressure switch
Accessory Drive Assembly Section
2.
The start switch
3.
The 95-percent switch
The accessory drive assembly section consists of a
4.
The 35-percent switch
set of reduction gears and drive shafts housed in a case
12-13
