CSD Disconnect in Aircraft Systems

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What is the purpose of disconnecting the CSD from the generator system?

To prevent further damage to the generator system (correct)

To switch it manually from the aircraft's flight deck

To control the rotational speed of the generator

To allow the CSD to be reconnected on the ground

How is the CSD disconnect activated?

Through the differential and variable displacement hydraulic units

Automatically by a generator control unit (correct)

By a spring-biased flyweight-operated hydraulic valve

By a mechanical control governing the rotational speed

What enables the rotational speed of the alternating current generator to be governed?

Control pressure in the transmission charge oil

Generator control valve

Fixed displacement hydraulic units

Differential and variable displacement hydraulic units (correct)

In the governing section of the CSD, what is the function of the governor?

Controlling porting of oil to the control cylinder Signup and view all the answers

What is the consequence of the CSD being disconnected from the generator system?

CSD cannot be reconnected in flight Signup and view all the answers

How is the power used to drive the alternating current generator controlled and transmitted?

By differential and fixed displacement hydraulic units Signup and view all the answers

What is the purpose of grounding in an aircraft electrical system?

To provide a path for unwanted RFI energy to dissipate Signup and view all the answers

Why is a two-wire electrical system necessary in aircraft built with composite materials?

As most composite materials are non-conductive Signup and view all the answers

What happens when the master switch in an aircraft is closed?

A ground path is completed to energize the battery solenoid coil Signup and view all the answers

What is the function of a battery solenoid in an aircraft's electrical system?

To control a large current source with a small conductor and switch Signup and view all the answers

Why is a negative-ground, single wire system used in most aircraft?

To reduce Radio Frequency Interference (RFI) Signup and view all the answers

What is the main difference between composite material-built aircraft and metallic structure-built aircraft in terms of electrical system design?

Composite material-built aircraft use two-wire systems due to non-conductive properties Signup and view all the answers

What is the frequency of the AC produced by the generators in a modern aircraft like a 787?

400 Hz Signup and view all the answers

How many secondary windings does the transformer in the aircraft have?

Two Signup and view all the answers

What component enables the reading of amps at auxiliary terminals?

Shunt Signup and view all the answers

What is the purpose of the thermal switch in the aircraft's system?

To provide warning for overheat conditions Signup and view all the answers

How many silicon diodes are connected in parallel in each bridge rectifier assembly?

Six Signup and view all the answers

What is the DC ripple frequency produced from the parallel rectified outputs of the two secondary windings?

4800 Hz Signup and view all the answers

What is the purpose of winding L4 in the generator system?

To carry the entire line current Signup and view all the answers

Why is contact C3 kept open when the generator is not operating?

To prevent the battery from motoring the generator Signup and view all the answers

What happens when the voltage of the generator is more than the normal voltage of the battery?

Contact C3 closes Signup and view all the answers

Why does the charging current passing through L4 help hold the contacts tightly closed?

It aids the current in L5 to keep contact C3 closed Signup and view all the answers

What role does coil spring S3 play in the system?

To determine when contact C3 should close Signup and view all the answers

How does a decrease in generator voltage affect contact C3?

It causes contact C3 to open Signup and view all the answers

What happens when the second aircraft engine is started and the generator is operating within system limits?

The GCB closes, tripping the BTB. Signup and view all the answers

What happens if one of the generators becomes inoperative?

The BTB trips, connecting both generator buses together. Signup and view all the answers

How are the AC non-essential loads and TRUs powered?

From the AC essential bus through a changeover relay. Signup and view all the answers

What happens to the BTB when both AC generators are operating within system tolerance?

It connects both generator buses together. Signup and view all the answers

Which buses are separated from each other for redundancy following power malfunctions?

Emergency and essential buses. Signup and view all the answers

What causes external power to be removed from the aircraft's system loads?

The BTB tripping. Signup and view all the answers