Aircraft Electrical Systems Quiz
47 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What triggers the opening of the TRU circuit breaker on a secondary feeder bus?

  • Failure of the start generator
  • An over current condition on the secondary feeder bus (correct)
  • A fault detected in the EPCU system
  • A low voltage condition on the primary bus

    • How long after sensing the TRU source fault does the EPCU close the secondary feeder bus tie contactor, K22?

  • 3 seconds
  • 7 seconds (correct)
  • 5 seconds
  • 10 seconds

    • What component protects the other TRU from the effects of the bus fault?

  • The secondary feeder bus tie contactor
  • The DC starter
  • The main circuit breaker
  • The cross tie fuse (correct)

    • What condition does the EPCU sense that leads to the closing of the K22 contactor?

    <p>A TRU source fault (A)</p> Signup and view all the answers

    What happens as a result of the high current condition on the secondary feeder bus?

    <p>The cross tie fuse opens (D)</p> Signup and view all the answers

    What supplies power to the DC generation system in the aircraft?

    <p>Three NiCad batteries and two engine-driven starter/generators (D)</p> Signup and view all the answers

    What voltage do the Transformer Rectifier Units (TRUs) supply?

    <p>28V DC (A)</p> Signup and view all the answers

    Which system is powered by the AC generators in the aircraft?

    <p>Standby Power Unit hydraulic pump (C)</p> Signup and view all the answers

    Where are the contactors that connect the main and auxiliary batteries located?

    <p>In the DC Contactor Box (DCCB) (A)</p> Signup and view all the answers

    Which of the following describes the AC generators' output?

    <p>Variable frequency, three-phase 115V AC (B)</p> Signup and view all the answers

    What is the primary role of the standby battery in the system?

    <p>To supply emergency 28 Vdc electrical power (B)</p> Signup and view all the answers

    How is the electrical load distributed for DC systems in the aircraft?

    <p>Using the DC electrical load distribution system (C)</p> Signup and view all the answers

    Which function do the deicing heaters serve in relation to the electrical system?

    <p>They use AC power supplied by the variable frequency generators (A)</p> Signup and view all the answers

    What is the role of the standby battery during an engine start condition?

    <p>It remains connected to the essential busses only. (A)</p> Signup and view all the answers

    Which batteries are connected to the main feeder busses to receive charging current?

    <p>The main and auxiliary batteries. (C)</p> Signup and view all the answers

    What must be done to allow the batteries to reconnect to the main feeder busses during an emergency start attempt?

    <p>The battery master toggle switch must be set to the ON position. (C)</p> Signup and view all the answers

    What mechanism prevents the standby battery from supplying power to the main feeder busses during engine start?

    <p>It is disconnected from the main feeder bus. (B)</p> Signup and view all the answers

    What is the primary function of the Electrical Power Generation and Distribution System (EPGDS)?

    <p>To provide electrical energy for all onboard electrical equipment (B)</p> Signup and view all the answers

    Which component in the flight compartment controls the battery system?

    <p>The battery master toggle switch. (A)</p> Signup and view all the answers

    Which sub-system of the EPGDS is responsible for energy storage?

    <p>Battery (D)</p> Signup and view all the answers

    What happens when an engine start attempt is made during emergency conditions without prior action?

    <p>The batteries will automatically reconnect to the main feeder busses. (A)</p> Signup and view all the answers

    How does the EPGDS handle power source and bus failures?

    <p>By automatic closing and opening of bus tie contactors (A)</p> Signup and view all the answers

    What type of power receptacles does the EPGDS provide for Ground Power Unit (GPU) connection?

    <p>Both AC and DC external power receptacles (C)</p> Signup and view all the answers

    Which of the following batteries is NOT connected to the main feeder busses for charging?

    <p>Standby battery. (A)</p> Signup and view all the answers

    Which sub-system of the EPGDS focuses on the protection of electrical components?

    <p>Protection (C)</p> Signup and view all the answers

    What should be monitored through the Engine and System Integrated Display (ESID)?

    <p>Electrical indications of the main 28 Vdc generation system. (A)</p> Signup and view all the answers

    What is the primary purpose of the battery power system in the aircraft?

    <p>To supply electrical power to the essential busses during emergency flight conditions. (C)</p> Signup and view all the answers

    What is the significance of the alternating current variable frequency in the EPGDS?

    <p>It ensures compatibility with various onboard equipment (C)</p> Signup and view all the answers

    Which system within the EPGDS generates 28 Vdc power?

    <p>Auxiliary Power Unit (APU) (D)</p> Signup and view all the answers

    What role does monitoring play in the EPGDS?

    <p>To track and report electrical system performance (B)</p> Signup and view all the answers

    What do the essential distribution busses rely on for energization when the main feeder busses are not available?

    <p>Standby, auxiliary, and main batteries (A)</p> Signup and view all the answers

    What triggers the bus contactor K1 or K2 to open circuit the DC starter/generator?

    <p>Malfunction of the DC starter/generator (B)</p> Signup and view all the answers

    When the EPCU senses a TRU malfunction, what action is taken?

    <p>The affected bus connects to the other TRU (C)</p> Signup and view all the answers

    What voltage threshold causes the DC GCU to de-energize the DC starter/generator?

    <p>More than 32.5 ±0.5 VDC (C)</p> Signup and view all the answers

    Which component is responsible for controlling the voltage of the DC starter/generator?

    <p>DC GCU (D)</p> Signup and view all the answers

    What happens when a fault is detected in the 28 Vdc generation system?

    <p>The fault is isolated for continued operation (C)</p> Signup and view all the answers

    How are the left and right essential distribution busses interconnected?

    <p>Using circuit breakers on each bus (A)</p> Signup and view all the answers

    What is the role of CR8, CR5, and CR4 in the electrical system?

    <p>They are isolation diodes for essential busses (D)</p> Signup and view all the answers

    What occurs when there is an over current condition on a secondary feeder bus?

    <p>The TRU circuit breaker opens. (A)</p> Signup and view all the answers

    What action does the EPCU take after one second of an over current condition?

    <p>It opens the bus fault contactors K5 and K6. (C)</p> Signup and view all the answers

    Which components are involved in isolating the bus fault in the event of an over current condition?

    <p>EPCU and bus tie contactors K5 and K6. (B)</p> Signup and view all the answers

    What is the purpose of the TRU circuit breaker in the main 28 Vdc generation system?

    <p>To isolate faults from secondary feeder bus. (B)</p> Signup and view all the answers

    What does the term 'reconfiguration logic' refer to in the context of the main 28 Vdc generation system?

    <p>The protocols for handling source malfunctions. (D)</p> Signup and view all the answers

    Which of the following actions does NOT take place during an over current fault condition?

    <p>The electrical load is increased. (A)</p> Signup and view all the answers

    What is the primary role of contactors K5 and K6 in the main 28 Vdc generation system?

    <p>To open and close circuits to isolate faulty components. (A)</p> Signup and view all the answers

    What must happen to maintain system integrity after a secondary feeder bus fault?

    <p>The bus fault must be isolated promptly. (A)</p> Signup and view all the answers

    Signup and view all the answers

    Study Notes

    De Havilland DHC-8-400 B1 & B2 Training Manual

    • Course Code: DGM12CBXX3Q4PW
    • Issue: 02
    • Date: 20 September 2024
    • Revision Date: 20 September 2024

    Chapter ATA 24 - Electrical Power

    • This manual is intended for training purposes only.
    • The chapter covers the electrical power system for the De Havilland DHC-8-400 aircraft.

    Contents

    • Electrical Power, General
      • Introduction
      • Electrical System Control and Indication
      • EPGDS Block Diagram
      • Energy conversion
      • Distribution
      • Storage
      • Control
      • Protection
      • Monitoring
      • Indication
      • Subsystems:
        • Alternating current variable frequency (24-21-00)
        • Main 28 Vdc generation (24-31-00)
        • Battery (24-32-00)
        • Auxiliary Power Unit (APU) 28 Vdc (24-33-00)
        • External ac ground power (24-41-00)
        • External dc ground power (24-42-00)
        • AC electrical load distribution (24-51-00)
        • DC electrical load distribution (24-61-00)
    • Battery System
      • Introduction
    • Main 28 VDC Generation System
      • Introduction
    • APU 28 VDC Generation System
      • Introduction
    • External DC Power
      • Introduction
    • AC Generation System
      • Introduction
    • DC Electrical Load Distribution
      • Introduction
    • AC Electrical Load Distribution
      • Introduction
    • Operation - Manual Control of Battery Contactors
      • Detailed Description
    • Operation - Battery System Indications
      • Detailed Description
    • Main 28 Vdc Generation System
      • Introduction
      • General Description
    • Main and Auxiliary Batteries
      • General Description
    • Emergency Mode
      • Detailed Description
    • Diagnostics and Monitoring
      • Detailed Description
    • Voltage Regulation
      • Detailed Description
    • Electrical Power Control Unit (EPCU)
      • Detailed Description
    • AC Generator Control Units
      • Detailed Description
    • AC Generator
      • Detailed Description
    • AC Contactor Boxes
      • Detailed Description
    • Standby Battery Contactor Box
      • Detailed Description
    • DC Current Transformers
      • Detailed Description
    • Current Shunts
      • Detailed Description
    • External AC Power
      • Introduction
    • External DC Power
      • Introduction

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    ATA 24 - SEP 2024 PDF

    Description

    This quiz assesses your understanding of aircraft electrical systems, focusing on the operation of Transformer Rectifier Units (TRUs), circuit breakers, and power distribution. You will answer questions related to system functions, component roles, and fault conditions that affect the secondary feeder bus.

    More Like This

    Aircraft Electrical Systems Circuit Breakers Quiz
    13 questions

    Aircraft Electrical Systems Circuit Breakers Quiz

    PhenomenalNumber avatar
    PhenomenalNumber
    Aircraft Electrical Systems Maintenance
    5 questions

    Aircraft Electrical Systems Maintenance

    IndulgentProsperity avatar
    IndulgentProsperity
    Aircraft Electrical Systems Quiz
    5 questions

    Aircraft Electrical Systems Quiz

    IndulgentProsperity avatar
    IndulgentProsperity
    Electrical Systems - Aircraft
    35 questions

    Electrical Systems - Aircraft

    PreeminentSaturn avatar
    PreeminentSaturn
    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser