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What is the main purpose of the undercurrent controller in a starter-generator system?

To provide backup electrical power

To conserve aircraft battery power

To ensure positive action of the starter (correct)

To control engine speed

Which component in the undercurrent controller controls the operation of the motor relay?

Starter generator

Engine starting circuit

Undercurrent relay (correct)

Motor relay

Why does the engine starting circuit shown in this figure only operate from external electrical power?

To allow self-contained starting

To conserve aircraft battery power

Due to aircraft design limitations (correct)

To ensure positive action of the starter

In the starter-generator system, what is the function of the motor relay?

Control input to the starter Signup and view all the answers

Why is it preferable to use external electrical power for engine starts instead of the aircraft battery?

To conserve aircraft battery power Signup and view all the answers

What action is taken to allow the use of external electrical power when there is not enough battery power to accelerate the engine?

Connect external electrical power to the aircraft Signup and view all the answers

Which relay is energized to start the fuel pumps during the engine starting process?

Throttle relay Signup and view all the answers

What is the role of the ignition relay in the starter-generator electrical circuit?

Closing the circuit to the ignition unit Signup and view all the answers

Why does the battery cut-out relay open the circuit to the B-4 relay during engine starting?

To disconnect the battery from the main DC bus Signup and view all the answers

What effect does energizing the motor relay have on the starter-generator system?

It closes the circuit from the main bus to the starter-generator Signup and view all the answers

What type of motor is typically used in a starter system?

Series-wound motor Signup and view all the answers

How is the torque of the starter motor transmitted to the clutch?

Through reduction gears Signup and view all the answers

What does the starter jaw do before engaging the engine cranking jaw?

It moves outward Signup and view all the answers

When does the starter motor automatically disengage?

After the engine reaches self-sustaining speed Signup and view all the answers

Which mechanism is used to disengage the starter drive from the engine drive?

Automatic release clutch mechanism Signup and view all the answers

What is the purpose of the battery switch in the context of the starter-generator system?

To connect the battery to the bus before applying external electrical power Signup and view all the answers

What role does the undercurrent relay play in the engine starting circuit?

It opens when the current draw drops below a certain value Signup and view all the answers

Why does the undercurrent relay close in the starter-generator system?

To complete a circuit from the DC bus to various relay coils Signup and view all the answers

What happens when the undercurrent relay opens in relation to other components?

The coils of various relays get de-energized Signup and view all the answers

How does the start cycle continue once the start switch is released?

Due to a completed circuit by the undercurrent relay Signup and view all the answers

What is the fundamental characteristic of a starter motor?

High torque output and smooth acceleration from rest to engine self-sustaining speed Signup and view all the answers

Which power sources are used for gas turbine starter motors?

Electric and pneumatic Signup and view all the answers

What does the engine start panel from a four-engine aircraft feature?

Individual fuel and ignition switches, an engine start selector switch, a start button, and starter system indicator lights Signup and view all the answers

Why is the starting procedure for most gas turbine engines basically the same?

To simplify training and operations Signup and view all the answers

What is the function of the motor relay in a starter-generator system?

Control the operation of the starter motor Signup and view all the answers

What is the purpose of the overrunning feature in the starter-generator system?

To prevent the engine from driving the starter motor beyond its design speed Signup and view all the answers

Why are starter-generator units desirable in gas turbine engines?

To reduce the total weight of starting system components Signup and view all the answers

What role does the series winding play in a starter-generator unit?

It produces a strong field and high torque for starting Signup and view all the answers

Why is it preferable to use external electrical power for engine starts instead of the aircraft battery?

To prevent draining the aircraft's battery when there is not enough power to accelerate the engine Signup and view all the answers

What component controls the operation of the motor relay in a starter-generator system?

The undercurrent controller Signup and view all the answers

What is the purpose of rotating the engine during the starting process?

To create airflow for combustion Signup and view all the answers

Why is an ignition system used during the engine starting process?

To create combustion Signup and view all the answers

What is the role of a starting system when motoring over an engine without ignition?

To perform maintenance checks Signup and view all the answers

Why is it important to have a duty cycle for starter motors?

To ensure time for cooling down Signup and view all the answers

How are the ignition system and starting system coordinated during an engine starting cycle?

By an electrical circuit Signup and view all the answers

What is the function of an undercurrent controller in a starter-generator system?

Regulate motor relay operation Signup and view all the answers

Why is external electrical power preferred for engine starts over using the aircraft battery?

Preserves battery power for other functions Signup and view all the answers

What is the primary reason for allowing the use of external electrical power when battery power is low?

Insufficient battery power for acceleration Signup and view all the answers

During an engine starting cycle, what effect does energizing the motor relay have on the starter-generator system?

Controls starter motor duty cycle timing Signup and view all the answers

Why does the starter motor have a duty cycle in gas turbine engines?

To allow time for cooling between starts Signup and view all the answers

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Questions and Answers

What is the main purpose of the undercurrent controller in a starter-generator system?

Which component in the undercurrent controller controls the operation of the motor relay?

Why does the engine starting circuit shown in this figure only operate from external electrical power?

In the starter-generator system, what is the function of the motor relay?

Why is it preferable to use external electrical power for engine starts instead of the aircraft battery?

What action is taken to allow the use of external electrical power when there is not enough battery power to accelerate the engine?

Which relay is energized to start the fuel pumps during the engine starting process?

What is the role of the ignition relay in the starter-generator electrical circuit?

Why does the battery cut-out relay open the circuit to the B-4 relay during engine starting?

What effect does energizing the motor relay have on the starter-generator system?

What type of motor is typically used in a starter system?

How is the torque of the starter motor transmitted to the clutch?

What does the starter jaw do before engaging the engine cranking jaw?

When does the starter motor automatically disengage?

Which mechanism is used to disengage the starter drive from the engine drive?

What is the purpose of the battery switch in the context of the starter-generator system?

What role does the undercurrent relay play in the engine starting circuit?

Why does the undercurrent relay close in the starter-generator system?

What happens when the undercurrent relay opens in relation to other components?

How does the start cycle continue once the start switch is released?

What is the fundamental characteristic of a starter motor?

Which power sources are used for gas turbine starter motors?

What does the engine start panel from a four-engine aircraft feature?

Why is the starting procedure for most gas turbine engines basically the same?

What is the function of the motor relay in a starter-generator system?

What is the purpose of the overrunning feature in the starter-generator system?

Why are starter-generator units desirable in gas turbine engines?

What role does the series winding play in a starter-generator unit?

Why is it preferable to use external electrical power for engine starts instead of the aircraft battery?

What component controls the operation of the motor relay in a starter-generator system?

What is the purpose of rotating the engine during the starting process?

Why is an ignition system used during the engine starting process?

What is the role of a starting system when motoring over an engine without ignition?

Why is it important to have a duty cycle for starter motors?

How are the ignition system and starting system coordinated during an engine starting cycle?

What is the function of an undercurrent controller in a starter-generator system?

Why is external electrical power preferred for engine starts over using the aircraft battery?

What is the primary reason for allowing the use of external electrical power when battery power is low?

During an engine starting cycle, what effect does energizing the motor relay have on the starter-generator system?

Why does the starter motor have a duty cycle in gas turbine engines?

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