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A&P Powerplant Oral Practice Questions > Ignition & Starting Systems > Flashcards

Ignition & Starting Systems Flashcards

1
Q
  1. What is a magneto?
A

Self contain AC generator that provides ignition to the engine

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2
Q
  1. Why are magneto ignition systems preferred over battery type ignition systems for reciprocating engine?
A

Magnetos are independent ignition source & do not rely on battery power

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3
Q
  1. What can cause a reciprocating engine to continue to run when ignition is in the off position?
A

P-lead break needs ground to shut off

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4
Q
  1. What is the purpose of the condenser in a high tension magneto electrical system?
A

Prevent arcing at the points & hasten magnetic field around primary coil

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5
Q
  1. Where is the e gap position?
A

Poles of rotating magnet are few degrees past neutral
Points start to open

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6
Q
  1. What are the three major circuits of a high tension magneto system?
A

Magnetic
Primary
Secondary

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7
Q
  1. What are the components of a high tension magnetic circuit?
A

Permanent rotation magnet
Soft iron core
Pole shoes

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8
Q
  1. What happens when the primary breaker points open in a magneto?
A

Stops flow of current in primary coil
Magnetic field collapses creating induce pulse of high voltage current creating spark

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9
Q
  1. What is the position position when the spark occurs in a cylinder?
A

Specified # of degrees before TDC

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10
Q
  1. What is a dual magneto?
A

Two magnetos in one housing

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11
Q
  1. What is the difference between a low tension and a high tension ignition system?
A

High tension - high voltage from magneto to plugs
Low voltage - low voltage from magneto to transformer coil near plug then increased to high

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12
Q
  1. When the ignition switch is OFF position, what is the condition of the primary circuit?
A

Completed through ignition switch to ground

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13
Q
  1. What three conditions are required to fire plugs in a cylinder when the piston is in the prescribed position?
A

E gap
Breaker points open
Distributor rotor aligned with electrode

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14
Q
  1. What is a dual ignition system, and what part of the system is grounded when the ignition switch is placed in the RIGHT position?
A

The left magneto is grounded meaning OFF

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15
Q
  1. What is internal timing of a magneto?
A

Adjusting the breaker points to open with poles of magnet

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16
Q
  1. What is the purpose of an impulse coupling used with a magneto?
A

Retard the timing of the spark till after TDC for starting

17
Q
  1. What is staggered ignition timing?
A

Fires one spark plug before the other vs all at same time

18
Q
  1. What is the proper spark plug reach?
A

When electrode end of the plug inside the cylinder is in the best opposition for ignition

19
Q
  1. Why is it important to keep track of the cylinders that spark plug are installed in?
A

Spark plugs provide health information about that cylinder

20
Q
  1. What type ignition system is used in most turbine engines?
A

Electronic capacitor type ignition system

21
Q
  1. What is the function of the igniter plugs in a turbine engine?
A

Provide discharge gap for current

22
Q
  1. When are turbine engine ignition system normally used?
A

For starting or restarting

23
Q
  1. What are two types of igniters plugs?
A

Annular gap
Constrained gap

24
Q
  1. What is the purpose of the dual magneto configuration?
A

Redundancy

25
Q
  1. How can you tell if a starter commutator is dirty or worn?
A

Excessively noisy starter

26
Q
  1. What does it mean when the starter relay clicks when the starter switch is placed in the START position?
A

Supply voltage too low

27
Q
  1. What is an advantage of air turbine starters, when compared to electric starter, for large turbine engines?
A

Light weight

28
Q
  1. Why do turbine igniters not get carbon fouled as often as reciprocating singe spark plugs?
A

Due to High rates of electrical discharge

29
Q
  1. What are the three parts of an ignition system of a turbine?
A

Exciter
Ignition lead
Igniter

30
Q
  1. What is the difference between a temporary magnet and a permanent magnet?
A

Permanent retains its magnetic properties
Temporary acts as permanent when within magnetic field of permanent magnet

A&P Powerplant Oral Practice Questions (15 decks)

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