POWER PLANT – ENGINE EXAM
QUESTIONS AND ANSWERS 100% PASS
1. Which condition would be the least likely to be caused by failed or failing
engine bearing?
A- Excessive oil consumption.
B- High oil temperatures.
C- Low oil temperatures. - ✔✔C- Low oil temperatures.
All of the alternatives except tow oil temperature would likely be caused by
failed or failing engine bearings in a reciprocating engine.
Low oil temperature would be the least likely of these alternatives.
2. At what point in an axial-flow turbojet engine will the highest gas
pressures occur?
A- At the turbine entrance.
B- Within the burner section.
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,C- At the compressor outlet. - ✔✔C- At the compressor outlet.
The highest gas pressure in an axial-flow turbojet engine occurs at the
outlet of the compressor.
The compressor outlet is the same as the burner inlet.
3. The fan rotational speed of a dual axial compressor forward fan engine is
the same as the
A- low-pressure compressor.
B- forward turbine wheel.
C- high-pressure compressor. - ✔✔A- low-pressure compressor.
The fan is a portion of the low-pressure compressor of a dual axial-flow
compressor. The rotor blades in the fan section are long enough that the air
they move passes around the outside of the gas generator portion of the
engine.
The fan rotational speed is the same as that of the low-pressure
compressor.
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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
,4. The abbreviation "P" with subscript t7 used in turbine engine terminology
means
A- the total inlet pressure.
B- pressure and temperature at station No.7.
C- the total pressure at station No.7. - ✔✔C- the total pressure at station
No.7.
Pressures in a turbine engine are identified according to their type and to
the location at which they are measured.
P, / is the total pressure (the pressure a body of moving fluid has when its
movement is stopped) measured at station 7, the turbine discharge.
5. What turbine engine section provides for proper mixing of the fuel and
air?
A- Combustion section.
B- Compressor section.
C- Diffuser section. - ✔✔A- Combustion section.
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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, In a turbojet engine, compressed air from the compressor is directed into
the combustion section.
Fuel is sprayed from nozzles in the combustion section where it mixes with
the air and burns.
6. In a gas turbine engine, combustion occurs at a constant
A- volume
B- pressure.
C- density. - ✔✔B- pressure.
The energy exchange cycle used in a turbojet engine is the Braytonn cycle
which is a constant-pressure cycle. The pressure of the air remains
relatively constant as the energy from the burning fuel is added to it.
Since the pressure remains constant as the volume of the gas increases,
its velocity increases.
7. Which statement is true regarding jet engines?
4
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
QUESTIONS AND ANSWERS 100% PASS
1. Which condition would be the least likely to be caused by failed or failing
engine bearing?
A- Excessive oil consumption.
B- High oil temperatures.
C- Low oil temperatures. - ✔✔C- Low oil temperatures.
All of the alternatives except tow oil temperature would likely be caused by
failed or failing engine bearings in a reciprocating engine.
Low oil temperature would be the least likely of these alternatives.
2. At what point in an axial-flow turbojet engine will the highest gas
pressures occur?
A- At the turbine entrance.
B- Within the burner section.
1
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
,C- At the compressor outlet. - ✔✔C- At the compressor outlet.
The highest gas pressure in an axial-flow turbojet engine occurs at the
outlet of the compressor.
The compressor outlet is the same as the burner inlet.
3. The fan rotational speed of a dual axial compressor forward fan engine is
the same as the
A- low-pressure compressor.
B- forward turbine wheel.
C- high-pressure compressor. - ✔✔A- low-pressure compressor.
The fan is a portion of the low-pressure compressor of a dual axial-flow
compressor. The rotor blades in the fan section are long enough that the air
they move passes around the outside of the gas generator portion of the
engine.
The fan rotational speed is the same as that of the low-pressure
compressor.
2
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
,4. The abbreviation "P" with subscript t7 used in turbine engine terminology
means
A- the total inlet pressure.
B- pressure and temperature at station No.7.
C- the total pressure at station No.7. - ✔✔C- the total pressure at station
No.7.
Pressures in a turbine engine are identified according to their type and to
the location at which they are measured.
P, / is the total pressure (the pressure a body of moving fluid has when its
movement is stopped) measured at station 7, the turbine discharge.
5. What turbine engine section provides for proper mixing of the fuel and
air?
A- Combustion section.
B- Compressor section.
C- Diffuser section. - ✔✔A- Combustion section.
3
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, In a turbojet engine, compressed air from the compressor is directed into
the combustion section.
Fuel is sprayed from nozzles in the combustion section where it mixes with
the air and burns.
6. In a gas turbine engine, combustion occurs at a constant
A- volume
B- pressure.
C- density. - ✔✔B- pressure.
The energy exchange cycle used in a turbojet engine is the Braytonn cycle
which is a constant-pressure cycle. The pressure of the air remains
relatively constant as the energy from the burning fuel is added to it.
Since the pressure remains constant as the volume of the gas increases,
its velocity increases.
7. Which statement is true regarding jet engines?
4
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
