Basic Aircraft Maintenance: Electrical Fundamentals

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Questions and Answers

Which source of electricity involves the movement of charged particles?

Light sources

Magnetism and motion (correct)

Friction

Chemical reactions

What is the primary function of a photovoltaic cell?

To convert light energy into electrical energy (correct)

To convert thermal energy into electrical energy

To store electricity for later use

To amplify electrical signals

Which material is commonly used in solar cells to absorb light?

Lead

Silicon (correct)

Aluminum

Copper

What generates electricity in thermocouples?

The combination of two dissimilar metal wires Signup and view all the answers

Which of the following methods is NOT a common source of electricity?

Compression Signup and view all the answers

What effect is described by the generation of voltage due to temperature differences at a junction of two materials?

Seebeck Effect Signup and view all the answers

Which statement best describes the holes generated in a photovoltaic cell?

They are the absence of electrons that create positive charges. Signup and view all the answers

What is the main outcome of understanding the mathematical formulae in relation to aircraft maintenance?

Capacity to combine and apply knowledge logically Signup and view all the answers

Which category must a Level 3 applicant demonstrate advanced knowledge for?

Category B1 or B2 Signup and view all the answers

What is the primary application of thermocouples in the aviation industry?

Measuring temperature Signup and view all the answers

What phenomenon occurs when electric current passes through two different materials, creating a temperature difference?

Peltier Effect Signup and view all the answers

Which of the following is NOT an objective of Level 2 knowledge?

Ability to prepare detailed sketches from memory Signup and view all the answers

Which effect relates the generation of electricity and heat exchange due to a thermal gradient?

Thomson Effect Signup and view all the answers

Which of the following accurately distinguishes the Thomson effect from the Seebeck and Peltier effects?

Thomson effect requires only one material. Signup and view all the answers

What is a primary application of thermocouples in aviation?

To monitor cylinder head temperatures. Signup and view all the answers

The process of generating electricity through friction typically involves what?

An imbalance of charges. Signup and view all the answers

What is the basic principle behind piezoelectric materials?

They establish voltage with mechanical stress. Signup and view all the answers

Which materials are commonly associated with piezoelectric properties?

Crystalline quartz and Rochelle salt. Signup and view all the answers

What occurs when mechanical pressure is applied to a piezoelectric crystal?

It produces an electric polarization. Signup and view all the answers

Which of the following is an example of a device that uses piezoelectric materials?

Microphones. Signup and view all the answers

The potential difference generated in piezoelectric materials is a result of what factor?

Mechanical pressure. Signup and view all the answers

What causes one terminal of a battery to develop a positive charge?

The chemical reaction that frees more electrons in one metal than the other. Signup and view all the answers

Which statement differentiates a fuel cell from a battery?

A battery converts chemical energy stored inside, whereas a fuel cell uses external supplies. Signup and view all the answers

What is induced current?

Current generated when a conductor is moved through a magnetic field. Signup and view all the answers

What occurs when a magnet is moved quickly near a coil?

The galvanometer needle moves, indicating current flow. Signup and view all the answers

What is a primary battery primarily composed of?

Two different metals in a chemical solution. Signup and view all the answers

Study Notes

GMR Aero School of Aviation

GMR Air Cargo and Aerospace Engineering Limited, Hyderabad, Telangana, India
Website: www.gmrschoolofaviation.com
Email: [email protected]

Basic Aircraft Maintenance Training Manual

Issue 03, Dated 01 Jul 2024
For training purposes only
Pages: 1–13

Module 3: Electrical Fundamentals

Submodule 3.4: Generation of Electricity

Foreword
Copyright Notice
Basic Knowledge Requirements
Knowledge Levels – Category A, B1, B2, B3 and C Aircraft Maintenance Licence
- Level 1
- Level 2
- Level 3
Abbreviations
1. Sources of Electricity
- 1.1 Light Sources
- 1.2 Heat Sources
- 1.3 Friction
- 1.4 Pressure Source
- 1.5 Chemical Reaction
- 1.6 Magnetism and Motion

Basic Knowledge Requirements

Study Notes comply with DGCA Regulation, CAR-66 (Appendix I) and EASA Regulation (EU) No. 1321/2014, Annex (Part-66) Appendix I
Associated Knowledge Levels specified
Objectives and levels for generation of electricity, production using various methods (light, heat, friction, pressure, chemical action, magnetism, and motion)
Knowledge Levels – Category A, B1, B2, B3, and C aircraft maintenance licence

1. Sources of Electricity

Electrical energy produced by various methods: light, heat, friction, pressure, chemical reaction, magnetism, and motion

1.1 Light Sources

Photovoltaic cells convert light energy directly into electricity
Photovoltaic effect releases electrons, generating electricity

1.2 Heat Sources

Thermocouples, widely used temperature sensors
Different metal combinations produce different voltage differences

1.3 Friction

Static electricity builds up from rubbing non-conductive materials
Electron transfer creates charge imbalance, discussed in sub-module 02

1.4 Pressure Sources

Piezoelectric effect generates electricity from mechanical pressure on dielectric crystals (e.g., quartz, Rochelle salt, barium titanate)
Polarization proportional to stress; voltage across crystal
Used in transducers, microphones, and loudspeakers

1.5 Chemical Reactions

Batteries and fuel cells convert chemical energy into electricity
Primary batteries use chemical reactions between metals and solutions
Fuel cells use external chemical fuel sources
Diagram of fuel cell (Figure 12) and battery (Figure 10)

1.6 Magnetism and Motion

Moving conductor through magnetic field generates electromotive force (EMF) and current flow
Induced current (examples and diagrams using galvanometer needle and magnet movement (Figure 13))

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Description

This quiz is based on Module 3 of the Basic Aircraft Maintenance Training Manual. It focuses specifically on the generation of electricity and its various sources relevant to aviation. Prepare to test your knowledge on electrical fundamentals necessary for aircraft maintenance and compliance with DGCA and EASA regulations.