Ignition And Stating System

Question 1

Name, one general type of inertia starter

Answer 1

Hand, electric, or combination of both

Question 2

What is a magneto?

Answer 2

Self-contained AC generator driven by engine for the purpose of ignition for reciprocating engine

Question 3

Why are magneto ignition system preferred over battery type ignition system for reciprocating engine

Answer 3

An independent ignition source do not rely on battery power to provide ignition

Question 4

What can cause a reciprocating engine to continue to run with the ignition switch is in the off position

Answer 4

Break in P lead from the magneto to the switch, then the ignition cannot be ground the primary circuit

Question 5

What is the purpose of a condenser in a high tension magneto electrical system?

Answer 5

Prevents arcing at the breaker point, and support rapid collapse of magnetic field around the primary coil.

Question 6

What does a capacitor do in the magneto circuit?

Answer 6

Prevent arcing at the point when the contact points open and support the collapse of the magnetic field around the primary coil

Question 7

Where is the E -gap position

Answer 7

When the poles of the rotating magnets are a few degrees past neutral position. The gap is the position which the point begins to open.

Question 8

What are the three major circuits of a high tension magneto system

Answer 8

Primary ,secondary circuit and magnetic circuit

Question 9

What are the components of a high tension magnetic circuit

Answer 9

Permanent rotating magnet, soft iron core and pole shoes

Question 10

What happens when the primary break points opening a magneto?

Answer 10

Opening of break points stops the flow of current in the primary coil. Magnetic field that was emitted by the primary coil collapses. as that happen ,the flex line cut across the winding of the secondary coil, produce high voltage current in the second coil needed to fire to spark plug

Question 11

What is the piston position when the spark occurs in a cylinder? 

Answer 11

Specified number of degrees before TDC of compression stroke

Question 12

What is dual magneto?

Answer 12

Two magneto in one housing that share rotating magnet and the cam they have their own sets of points ,coil and distributor block

Question 13

What is the difference between low tension and high tension magneto ignition system

Answer 13

High tension magneto product high voltage in the magneto and flow to the plug through high tension leads
Low tension only product low voltage need transformer to step up the voltage then pass through high tension lead to the spark plug

Question 14

When the ignition is in the of position, what is the condition of the primary circuit

Answer 14

the primary circuit is completed through ignition switch to ground 

Question 15

What three conditional required to fire plugs in a cylinder with a piston is in prescribed position

Answer 15

Magnet poles must be in E-gap position, breaker point must be open and the distributor must be aligned with the distributor electrode for that cylinder

Question 16

What is dual ignition system and what part of the system is grounded when the ignition switch is placed in right position

Answer 16

Uses two separate magneto with harness arranged so that each each magneto fires one plug each cylinder  and the left magneto is grounded and the switch is turned to the right

Question 17

What is internal timing of a magneto?

Answer 17

Adjusting the break up points to open when the poles of the rotate magnet are in a E gap position

Question 18

What is the purpose of an impulse coupling used in a magneto?

Answer 18

The retard, the timing, old spark at the top dead center for starting the engine and provide momentarily high rotational speed to produce a spark at low rpm

Question 19

What is staggered ignition timing

Answer 19

The firing of one spark plug before the other

Question 20

What is the proper spark plug reach?

Answer 20

When the electrode end of the plug inside a cylinder is in the best position to achieve ignition

Question 21

Why is it important to keep track of the cylinders that Spark plugs are installed in.

Answer 21

Spark plug can provide a lot information about the health of a specific cylinder

Question 22

What type of ignition system is used in most turbine engine

Answer 22

Electronic capacitor type

Question 23

What is the function of the ignitor Plugs in the turbine engine?

Answer 23

To provide a discharge gap for current, which is stored in the capacitor. Discharge result in a high intensity spark which is ignite to fuel air mixture.

Question 24

When are turbine engine ignition system normally in use

Answer 24

 During engine starting, or restarting the engine

Question 25

What are the two types of ignitor Plugs?

Answer 25

Annular gap, which is a long reach, extend into the combustion chamber chamber
Constrained gap which is a short reach, does not reach Into combustion chamber

Question 26

What is the purpose of dual magneto configuration?

Answer 26

For safety and redundancy

Question 27

How can you tell if a starter commutator is dirty or worn

Answer 27

Noisy starter

Question 28

What does it mean when the starter relay clicks when the starter switch is placed start position

Answer 28

voltage supply is too low to supply current into the relay coil to fully engage the contact point

Question 29

What is an advantage of air turbine starters, when compared to electric starter, for large turbine engine?

Answer 29

Light weight don’t have the same cool down period as electrical starter.

Question 30

Why do turbine ignitors not get a carbon fouled as often as reciprocating engine spark plug

Answer 30

High intensity discharge cleans the igniter

Question 31

What are the three parts of an ignition system of a turbine

Answer 31

Exciter, ignition lead, and igniter

Question 32

What is the difference between a temporary magnet and a permanent magnet?

Answer 32

Permanent magnet, retain its magnetic properties for a long period of time
Temporary magnet act like a permanent magnet when they are within a strong magnetic field or have currents flow through them

Question 33

What does ignition light indicate when timing of magneto?

Answer 33

Indicates the points are beginning to open

Question 34

In terms of engine crankshaft position, when does ignition event occur

Answer 34

Specified number of degrees before TDC on the compression stroke

Question 35

What is the purpose of the capacitor in a magneto?

Answer 35

Prevent arcing at the point and aid collapsing of magnetic field

Question 36

What is the main concern when preparing to make magneto for installation?

Answer 36

Internal timing

Question 37

What are the three event required to fire a spark plug in a cylinder when the piston is in describe position

Answer 37

Magneto in e-gap position, make a point opening, distributor is electrically aligned with that cylinder 

Question 38

What is the function of duty cycle in relationship to turbine engine ignition system?

Answer 38

Allows operation of the ignition system for giving amount of time, followed by minimum specified cooling down time

Question 39

Name three source of high-volume low-pressure compressed air commonly used for starting transport aircraft equipped with air turbine starter

Answer 39

APU, GPU, and bleed air from an already running engine

Question 40

Name the two parts of a starter generator that commonly required periodic inspection to ensure they do not wear beyond operational limits

Answer 40

Commutator and brushes

Question 41

Between the field and the Armature winding in the starter generator, which ordinarily receive current from operation in the start mode

Answer 41

Both the field and the armature receive current