AMS 272 UNIT 3 EXAM QUESTIONS AND ANSWERS
What is kickback caused by? - CORRECT ANSWER✅✅improper timing, pre ignition
What motors use intermittent operation? - CORRECT ANSWER✅✅series
What motors use continuous operation? - CORRECT ANSWER✅✅shunt
How long is intermittent operation? - CORRECT ANSWER✅✅less than 2 minutes
How long is continuous operation? - CORRECT ANSWER✅✅more than 2 minutes
What type of motor is a starter motor? - CORRECT ANSWER✅✅series
What is an issue that often occurs with series wound motors? - CORRECT ANSWER✅✅they can
runaway with no load on
Starter generator terminal: A - CORRECT ANSWER✅✅generator field circuit
Starter generator terminal: B - CORRECT ANSWER✅✅positive gen bus
Starter generator terminal: C - CORRECT ANSWER✅✅STARTER CIRCUIT
Starter generator terminal: E - CORRECT ANSWER✅✅negative ground
What disconnects the power from the gen starter in a turbine engine during start up? - CORRECT
ANSWER✅✅the undercurrent relay
What disconnects the power from the gen starter in the APU during start up? - CORRECT
ANSWER✅✅50% RPM switch or time limiting circuit (90sec)
, The purpose of an undercurrent relay in an aircraft's starter/generator system is to - CORRECT
ANSWER✅✅Disconnect power from the starter/generator and ignition when sufficient engine
operating speed is achieved.
What is an ignition system rated in? - CORRECT ANSWER✅✅Joules (watt-seconds)
Purpose of a bleed resistor - CORRECT ANSWER✅✅bleeds off the charge of the capacitors so you dont
die when removing ignitors
Thermocouples are made of - CORRECT ANSWER✅✅chromel or alumel
What does a typical turbine engine ignition system consist of? - CORRECT ANSWER✅✅-2 ignition
exciters
-2 high tension leads
-2 igniters
Steps for ignitor removal - CORRECT ANSWER✅✅1. pull CB
2. wait 10 mins
3. disconnect ignitor lead at plug
4. short it to ground (redundancy)
What type of engine is an APU and where is it usually located? - CORRECT ANSWER✅✅turbo shaft in
the aft fuselage
How does the APU door flap? - CORRECT ANSWER✅✅it's electrically actuated along with the vortex
generator and is stopped by limit switches
Purpose of the APU load compressor - CORRECT ANSWER✅✅supplies bleed air to the aircraft
What is kickback caused by? - CORRECT ANSWER✅✅improper timing, pre ignition
What motors use intermittent operation? - CORRECT ANSWER✅✅series
What motors use continuous operation? - CORRECT ANSWER✅✅shunt
How long is intermittent operation? - CORRECT ANSWER✅✅less than 2 minutes
How long is continuous operation? - CORRECT ANSWER✅✅more than 2 minutes
What type of motor is a starter motor? - CORRECT ANSWER✅✅series
What is an issue that often occurs with series wound motors? - CORRECT ANSWER✅✅they can
runaway with no load on
Starter generator terminal: A - CORRECT ANSWER✅✅generator field circuit
Starter generator terminal: B - CORRECT ANSWER✅✅positive gen bus
Starter generator terminal: C - CORRECT ANSWER✅✅STARTER CIRCUIT
Starter generator terminal: E - CORRECT ANSWER✅✅negative ground
What disconnects the power from the gen starter in a turbine engine during start up? - CORRECT
ANSWER✅✅the undercurrent relay
What disconnects the power from the gen starter in the APU during start up? - CORRECT
ANSWER✅✅50% RPM switch or time limiting circuit (90sec)
, The purpose of an undercurrent relay in an aircraft's starter/generator system is to - CORRECT
ANSWER✅✅Disconnect power from the starter/generator and ignition when sufficient engine
operating speed is achieved.
What is an ignition system rated in? - CORRECT ANSWER✅✅Joules (watt-seconds)
Purpose of a bleed resistor - CORRECT ANSWER✅✅bleeds off the charge of the capacitors so you dont
die when removing ignitors
Thermocouples are made of - CORRECT ANSWER✅✅chromel or alumel
What does a typical turbine engine ignition system consist of? - CORRECT ANSWER✅✅-2 ignition
exciters
-2 high tension leads
-2 igniters
Steps for ignitor removal - CORRECT ANSWER✅✅1. pull CB
2. wait 10 mins
3. disconnect ignitor lead at plug
4. short it to ground (redundancy)
What type of engine is an APU and where is it usually located? - CORRECT ANSWER✅✅turbo shaft in
the aft fuselage
How does the APU door flap? - CORRECT ANSWER✅✅it's electrically actuated along with the vortex
generator and is stopped by limit switches
Purpose of the APU load compressor - CORRECT ANSWER✅✅supplies bleed air to the aircraft
