AMS 274 Unit 4 Exam Questions With
Correct Answers
A typical Gear ratio for an air turbine starter is 25:1. If the turbine is rotating @
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80,000 RPM's, what would the input RPM be to the gear box? - CORRECT
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ANSWER✔✔-3,200 RPM |
With a variable vane system when will the vanes be most closed? - CORRECT
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ANSWER✔✔-at Low RPM | |
What happens if the vanes are stuck in the open position? - CORRECT
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ANSWER✔✔-Engine will stall in low power | | | | |
A clicking noise heard from an air turbine starter on engine coast down is a result
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of what? - CORRECT ANSWER✔✔-Pawls re-engaging and riding the ratchet in
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case we need a re-start
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Which igniter plug requires special handling due to semi-conductor material? -
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CORRECT ANSWER✔✔-Low voltage shunted surface gap (Self Ionizing)
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What does the semi conductor material do when its HOT and COLD? - CORRECT
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ANSWER✔✔-Cold- Conducts | |
Hot- Isolates
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, What is autoignition and what does it sense? - CORRECT ANSWER✔✔-Ensures
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instantaneous igniton if an engine loses power. Senses Torque, Oil Pressure, and
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loss of Compressure dischatge pressure
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What positions are fail type anti-ice valves in? - CORRECT ANSWER✔✔-Powered
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closed and spring loaded open
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What instrument indication would you most likely see when engine anti-ice is
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turned on? - CORRECT ANSWER✔✔-Slight Rise in EGT (10 Degrees)
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Starting sequence - CORRECT ANSWER✔✔-Starter, Ignition, Fuel
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When do you disengage the starter? - CORRECT ANSWER✔✔-When it reaches
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self accelerating speed
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Where is the Pressure Regulating and Shutoff valve located? - CORRECT
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ANSWER✔✔-Pneumatic starter Unit | |
What does the PRSV do? (Pressure Regulating, and Shutoff valve) - CORRECT
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ANSWER✔✔-controls airflow to the pneumatic starter | | | | |
What parameter is the most critical to observe? - CORRECT ANSWER✔✔-TIT
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What indicates a successful start on a turbine engine? - CORRECT ANSWER✔✔-
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Rise in EGT
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Correct Answers
A typical Gear ratio for an air turbine starter is 25:1. If the turbine is rotating @
| | | | | | | | | | | | | | | | |
80,000 RPM's, what would the input RPM be to the gear box? - CORRECT
| | | | | | | | | | | | | |
ANSWER✔✔-3,200 RPM |
With a variable vane system when will the vanes be most closed? - CORRECT
| | | | | | | | | | | | | |
ANSWER✔✔-at Low RPM | |
What happens if the vanes are stuck in the open position? - CORRECT
| | | | | | | | | | | | |
ANSWER✔✔-Engine will stall in low power | | | | |
A clicking noise heard from an air turbine starter on engine coast down is a result
| | | | | | | | | | | | | | | |
of what? - CORRECT ANSWER✔✔-Pawls re-engaging and riding the ratchet in
| | | | | | | | | | |
case we need a re-start
| | | |
Which igniter plug requires special handling due to semi-conductor material? -
| | | | | | | | | | |
CORRECT ANSWER✔✔-Low voltage shunted surface gap (Self Ionizing)
| | | | | | |
What does the semi conductor material do when its HOT and COLD? - CORRECT
| | | | | | | | | | | | | |
ANSWER✔✔-Cold- Conducts | |
Hot- Isolates
|
, What is autoignition and what does it sense? - CORRECT ANSWER✔✔-Ensures
| | | | | | | | | | |
instantaneous igniton if an engine loses power. Senses Torque, Oil Pressure, and
| | | | | | | | | | | |
loss of Compressure dischatge pressure
| | | |
What positions are fail type anti-ice valves in? - CORRECT ANSWER✔✔-Powered
| | | | | | | | | | |
closed and spring loaded open
| | | |
What instrument indication would you most likely see when engine anti-ice is
| | | | | | | | | | | |
turned on? - CORRECT ANSWER✔✔-Slight Rise in EGT (10 Degrees)
| | | | | | | | |
Starting sequence - CORRECT ANSWER✔✔-Starter, Ignition, Fuel
| | | | | |
When do you disengage the starter? - CORRECT ANSWER✔✔-When it reaches
| | | | | | | | | | |
self accelerating speed
| |
Where is the Pressure Regulating and Shutoff valve located? - CORRECT
| | | | | | | | | | |
ANSWER✔✔-Pneumatic starter Unit | |
What does the PRSV do? (Pressure Regulating, and Shutoff valve) - CORRECT
| | | | | | | | | | | |
ANSWER✔✔-controls airflow to the pneumatic starter | | | | |
What parameter is the most critical to observe? - CORRECT ANSWER✔✔-TIT
| | | | | | | | | |
What indicates a successful start on a turbine engine? - CORRECT ANSWER✔✔-
| | | | | | | | | | |
Rise in EGT
| |
