Aeroplane Electrical Power System Maintenance Quiz

What type of electrical power system can be found in aircraft?

Both AC and DC power (correct)

DC power only

Mechanical power

AC power only

Which manuals are referenced when performing maintenance on aircraft electrical systems?

Airplane Mode Selector Guide and Aircraft Wiring Handbook

Aircraft Navigation Manual and Radio Communication Guide

Aircraft Maintenance Manual and Illustrated Parts Catalogue (correct)

Aircraft Operations Manual and Flight Crew Operating Manual

Which ATA chapters are relevant to aircraft electrical power systems maintenance?

ATA 20 and ATA 24 (correct)

ATA 30 and ATA 33

ATA 15 and ATA 18

ATA 40 and ATA 43

What type of system do aircraft batteries almost without exception use?

Single-wire earth returns system Signup and view all the answers

What purpose does the standby AC and/or DC system in aircraft serve?

Redundant power source for normal and emergency power Signup and view all the answers

How is the negative terminal of the battery connected in an aircraft electrical system?

Connected to the metallic portion of the aircraft structure Signup and view all the answers

What is the purpose of the sump jar with a neutralising agent in System A?

To prevent acid or alkaline fumes from damaging the aircraft skin Signup and view all the answers

What distinguishes System B from System A and System C in the context of battery ventilation systems?

System B does not incorporate a sump jar Signup and view all the answers

What type of batteries are commonly found in light aircraft based on the provided information?

Lead-acid batteries with bolt-on connections Signup and view all the answers

In a pressurised aircraft using a sealed-case battery, how is the ventilation system typically connected to the battery?

Connected to the battery case Signup and view all the answers

Which component prevents external connections from protruding through larger fully enclosed batteries?

Quick disconnect socket Signup and view all the answers

Why is it advised to smear lugs with an approved lubricant before connecting light aircraft batteries?

To prevent corrosion Signup and view all the answers

What is the purpose of the reverse current cut-out in a three-unit regulator for generator systems?

To disconnect the battery from the generator. Signup and view all the answers

What is the consequence of 'motoring' the generator when the battery is not disconnected?

Discharging the battery in a short time. Signup and view all the answers

What causes an intermittent short circuit in a three-unit regulator's voltage regulator unit?

Vibrating contact C1. Signup and view all the answers

How does the current regulator unit in a three-unit regulator function?

By limiting the output current of the generator. Signup and view all the answers

What is the role of vibrating contact C1 in a three-unit regulator's voltage regulator unit?

Causing an intermittent short circuit. Signup and view all the answers

Why is it important to disconnect the battery from the generator when it is not operating?

To prevent motoring the generator. Signup and view all the answers

What function does the 400 Hz oscillator have in a static inverter?

Producing signals with correct timing Signup and view all the answers

Which component of the static inverter block diagram is responsible for producing a 400 Hz square wave at the correct voltage and frequency?

Pulse shaper and power driver Signup and view all the answers

What is the main purpose of the final filter in a static inverter?

Conditioning the signal for use (pure sine wave) Signup and view all the answers

Why should static inverters be sent to approved facilities for repair?

To ensure correct voltage and frequency maintenance Signup and view all the answers

What role do transformers play in changing AC voltage and current values?

Transformers Signup and view all the answers

In what way has miniaturization impacted static inverters?

Made them relatively small and lightweight Signup and view all the answers

What is the purpose of ensuring no external power source with reverse polarity or reverse phase sequence supplies power to the aircraft's electric power system?

To prevent damage to the aircraft's electrical equipment Signup and view all the answers

Why does the DC external power receptacle have a smaller pin used for interlock sensing and polarity check?

To ensure correct plug insertion and prevent arcing Signup and view all the answers

What is the purpose of the shorter length of the smaller pin in the DC external power receptacle?

To ensure breaking of the supply at the contactor to prevent arcing Signup and view all the answers

Why are different-sized prongs used in the external power plug to connect to the aircraft?

To make it impossible to insert the plug incorrectly Signup and view all the answers

What happens if the external power relay de-energizes before the main pins are disengaged from the socket?

Arcing occurs at the pins Signup and view all the answers

How does the DC external power receptacle ensure that arcing at the pins is prevented?

By breaking the supply at the contactor before disengagement Signup and view all the answers