Exam Review 1 Flashcards by Tristan Jhaye

When removing electrical power switches should be in what position and circuit breakers?

Switches OFF

Circuit Breakers Opened

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All circuit breakers should be ?

Collared

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What information goes on a PLACARD?

Instruction
Reason
Identification
Date
Time

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When using tools on electrical circuits, they should be what?

Careful

Insulated

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What is the sequence for connecting to ground power?

Ground FIRST,

Air frame SECOND

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When connecting to ground power you must be sure of what?

ALL controls are in agreement with surface potions

- Correct POLARITY

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What is the procedure for checking continuity?

Power OFF

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Procedure for checking voltage?

DO NOT TOUCH METAL PARTS

- Parallel

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Define Short CIRCUIT

Something “LIVE” touching the “GROUNDED” air frame structure

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What is the sequence for removing a battery?

Remove NEGATIVE FIRST

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Sequence for installing a battery?

Attach NEGATIVE LAST

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What is the neutralizing agent for Lead Acid?

a Base such as BAKING SODA

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Neutralizing agent for NICAD?

an BORIC ACID

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Describe THERMAL RUNAWAY?

a condition in a NICAD that reduces cell resistance allow more current to flow thus destroying the battery

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Symptoms of thermal runaway?

Decrease RESISTANCE
Increase CURRENT
Increase TEMP.

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When is THERMAL RUNAWAY likely to occur?

BEGINNING/END of a CHARGING cycle

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Describe a block diagram?

“STAGES”

- Principles

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Describe Pictorial diagram?

Real Appearance
Assembly
Locating

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Describe a Schematic diagram??

Symbols

- Testing/Trouble

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The Schematic Symbols!!!!!

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Describe the characteristics of aircraft wire

Stranded Cu (flexible)
19 strands
MIL
Will not break due to VIBRATION
Bigger #, SMALLER wire

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Considerations for wire size

Current
V Drop
Chart (V, ft, Amp)

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What 2 metals make up solder?

Tin and Lead

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What is a procedure for reliable solder joints?

Clean with:

Water
Flux

What is FLUX?

- Removes SURFACE OXIDES - Reduce SURFACE TENSION - Wetting

Bend radius of a wire bundle should not be more than?

10x the OUTSIDE diameter of the LARGEST wire in the bundle

Describe wire bundle spacing

- Standoff/spacers - Separate new and old - Separate from COAX, fluid, controls

Describe wire and cable clamping requirements

- Adel/P clamps - Metal/Synthetic - ZERO wire - LIMITED coax/RF

Describe wire bundle spacing through a bulkhead

- Grommets (1/4) | - Conduit

Describe terminals?

- Electrical connection at END of a wire | - Not exceed 4

Describe splices

Joins 2 stripped wires

What are the splice colour codes?

- Red (18-24) - Blue (14-16) - Yellow (10-12)

Requirements for ELECTRICAL TERMINATION

- Proper size and crimping tools | - Don't exceed 4 connections

Lab tools??

Know what they are and what they look like

Describe requirements for splicing

- No more than 1 splice per wire segment - Not withing 12" of termination - Outside of bundle - Should not be one on top of other

What is grounding?

Connecting conductive things to to other conductive things to complete a CIRCUIT

What is bonding??

Connecting things together via rivets/bolts

What is shielding??

- Conductive braids - Continuous to ground - Grounds EMFs to not interfere

What is the difference between GROUNDING and BONDING?

Minimum resistance for a ground/bond?

Don't exceed 0.003 Ohms

Describe aircraft wire identification #/N

- Last number is GAUGE | - N = GROUND wire

Identify proper clamping procedures

- Must not cause movement of clamp - Brackets ensure clamp placement - If bulkhead clearance less than 3/8 use grommet

Describe a wire extractor extortion tool?

- Use appropriate when removing contacts | - Have on hand prior to locking

What is Dry cell?

- Primary | - Disposable

What is a wet cell??

- Secondary | - Rechargeable

What is the between dry and wet?/

One is rechargeable

What determines VOLTAGE of a battery?

TYPE of material used

What determines the CURRENT of the battery?

AMOUNT of material used (AREA of plates)

What determines the capacity of the battery??

Current delivered over TIME

What term describes BATTERY CAPACITY??

AMPERE/HR

A battery rated at 50AH can deliver 5A for how many hours?

10 hours

Describe OCV and CCV?

- Internal Resistance - OCV no load (high) - CCV with load

What are the 3 functions of a battery?

- engine/APU starts - 30min emergency - Additional current for high loads

What is the OCV of a LEAD ACID battery?

2.1 v

Describe a negative and positive plate?

- Grid/Active material - Negative Plate (spongy lead, gray) - Positive Plate (peroxide, brown)

What are the safety precautions of a lead acid battery??

- Protection | - Baking soda

Basic procedure for charging a lead acid battery?

- Remove VENT CAPS - Add electrolyte/water - SG of each cell - Charger

Definition of specific gravity

- Density of ELECTROLYTE compared to WATER | - Hydrometer

SG of fully charged LEAD ACID?

- Check SG of ELECTROLYTE | - 1.3