Powerplant Part 3

When a magneto is disassembled, keepers are usually placed across the poles of the rotating magnet to reduce the loss of magnetism. These keepers are usually made of

How is the strength of a magneto magnet checked?

The E-gap angle is usually defined as the number of degrees between the neutral position of the rotating magnet and the position

The greatest density of flux lines in the magnetic circuit of a rotating magnet-type magneto occurs when the magnet is in what position?

Magneto breaker point opening relative to the position of the rotating magnet and distributor rotor (internal timing) can be set most accurately

Why are high-tension ignition cables frequently routed from the distributors to the spark plugs in flexible metallic conduits?

What will be the results of increasing the gap of the breaker points in a magneto?

What is the purpose of a safety gap in some magnetos?

When timing a magneto internally, the alignment of the timing marks indicates that the

When internally timing a magneto, the breaker points begin to open when the rotating magnet is

Magneto timing drift is caused by erosion of the breaker points and

What is the electrical location of the primary capacitor in a high-tension magneto?

In a high-tension ignition system, the current in the magneto secondary winding is

When a 'Shower of Sparks' ignition system is activated at an engine start, a spark plug fires

What is the radial location of the two north poles of a four-pole rotating magnet in a high-tension magneto?

Magneto pole shoes are generally made of

Capacitance afterfiring in most modern spark plugs is reduced by the use of

What components make up the magnetic system of a magneto?

In an aircraft ignition system, one of the functions of the capacitor is to

When will the voltage in the secondary winding of a magneto, installed on a normally operating engine, be at its highest value?

When the switch is off in a battery ignition system, the primary circuit is

As an aircraft engine's speed is increased, the voltage induced in the primary coil of the magneto

When internally timing a magneto, the breaker points begin to open when

The purpose of a safety gap in a magneto is to

A defective primary capacitor in a magneto is indicated by

How many secondary coils are required in a low-tension ignition system on an 18-cylinder engine?

A magneto ignition switch is connected

The spark is produced in a magneto ignition system when the breaker points are

Shielding is used on spark plug and ignition wires to

What is the purpose of using an impulse coupling with a magneto?

The purpose of staggered ignition is to compensate for

Aircraft magneto housings are usually ventilated in order to

Failure of an engine to cease firing after turning the magneto switch off is an indication of

Alignment of the marks provided for internal timing of a magneto indicates that the

When using a timing light to time a magneto to an aircraft engine, the magneto switch should be placed in the

What is the difference between a low-tension and a high-tension engine ignition system?

What test instrument could be used to test an ignition harness for suspected leakage?

The amount of voltage generated in any magneto secondary coil is determined by the number of windings and by the

Magneto breaker points must be timed to open when the

(2) the timed opening of the retard breaker points is designed to prevent engine 'kickback' during start.Regarding the above statements,

The capacitor-type ignition system is used almost universally on turbine engines primarily because of its high voltage and

In a low-tension ignition system, each spark plug requires an individual

A certain nine-cylinder radial engine used a noncompensated single-unit, dual-type magneto with a four-pole rotating magnet and separately mounted distributors. Which of the following will have the lowest RPM at any given engine speed?

What will be the effect if the spark plugs are gapped too wide?

When removing a shielded spark plug, which of the following is most likely to be damaged?

What likely effect would a cracked distributor rotor have on a magneto?

How does the ignition system of a gas turbine engine differ from that of a reciprocating engine?

In a turbine engine dc capacitor discharge ignition system, where are the high-voltage pulses formed?

Which of the following breaker point characteristics is associated with a faulty capacitor?

How are most radial engine spark plug wires connected to the distributor block?

Thermocouples are usually inserted or installed on the

Capacitance afterfiring of a spark plug is caused by

If it is found that a shielded ignition system does not adequately reduce ignition noise, it may be necessary to install

When a magneto is operating, what is the probable cause for a shift in internal timing?

Why are turbine engine igniters less susceptible to fouling than reciprocating engine spark plugs?

The constrained-gap igniter plug used in some gas turbine engines operates at a cooler temperature because

What should be used to clean grease or carbon tracks from capacitors or coils that are used in magnetos?

Generally, when removing a turbine engine igniter plug, in order to eliminate the possibility of the technician receiving a lethal shock, the ignition switch is turned off and

Great caution should be exercised in handling damaged hermetically sealed turbine engine igniter transformer units because

Igniter plugs used in turbine engines are subjected to high intensity spark discharges and yet they have a long service life because they

The electrical circuit from the spark plug back to the magneto is completed by grounding through the

Spark plugs are considered worn out when the

Which of the following could cause damage to the nose ceramic or to the electrode of an aircraft spark plug?

Sharp bends should be avoided in ignition leads primarily because

In a high-tension ignition system, a primary capacitor of too low a capacity will cause

Which of the following, obtained during magneto check at 1,700 RPM, indicates a short (grounded) circuit between the right magneto primary and the ignition switch?

If an aircraft ignition switch is turned off and the engine continues to run normally, the trouble is probably caused by

Which statement is correct regarding the ignition system of a turbine engine?

When the ignition switch of a single (reciprocating) engine aircraft is turned to the OFF position,

A spark plug's heat range is the result of

If staggered ignition timing is used, the

The term 'reach,' as applied to spark plug design and/or type, indicates the

The numbers appearing on the ignition distributor block indicate the

When testing a magneto distributor block for electrical leakage, which of the following pieces of test equipment should be used?

(1) The platinum and iridium ground electrodes used on fine wire spark plugs are extremely brittle and can be broken if they are improperly handled or adjusted.

Hot spark plugs are generally used in aircraft powerplants

If a spark plug lead becomes grounded, the

Which of the following statements regarding magneto switch circuits is NOT true?

Which of the following statements most accurately describes spark plug heat range?

When does battery current flow through the primary circuit of a battery ignition coil?

In order to turn a magneto off, the primary circuit must be

When performing a magneto ground check on an engine, correct operation is indicated by

Defective spark plugs will cause the engine to run rough at

A spark plug is fouled when

Which of the following would be cause for rejection of a spark plug?

What will be the result of using too hot a spark plug?

Upon inspection of the spark plugs in an aircraft engine, the plugs were found caked with a heavy black soot. This indicates

Spark plug heat range is determined by

Ignition check during engine runup indicates excessive RPM drop during operation on the right magneto. The major portion of the RPM loss occurs rapidly after switching to the right magneto position (fast drop). The most likely cause is

If new breaker points are installed in a magneto on an engine, it will be necessary to time the

Using a cold spark plug in a high-compression aircraft engine would probably result in

Spark plug fouling caused by lead deposits occurs most often

In a four-stroke cycle aircraft engine, when does the ignition event take place?

When installing a magneto on an engine, the

The spark occurs at the spark plug when the ignition's

The type of ignition system used on most turbine aircraft engines is

Ignition check during engine runup indicates a slow drop in RPM. This is usually caused by

If the ground wire of a magneto is disconnected at the ignition switch, the result will be the

Which of the following are advantages of dual ignition in aircraft engines?
1. Gives a more complete and quick combustion of the fuel.
2. Provides a backup magneto system.
3. Increases the output power of the engine.

How does high-tension ignition shielding tend to reduce radio interference?

Which of the following are distinct circuits of a high-tension magneto?
1. Magnetic.
2. Primary.
5. Secondary.

What are two parts of a distributor in an aircraft engine ignition system?

2. Block.
4. Rotor.

What is a result of 'flashover' in a distributor?

What is the relationship between distributor and crankshaft speed of aircraft reciprocating engines?

Why do turbine engine ignition systems require high energy?

Which of the following are included in a typical turbine engine ignition system?

1. Two igniter plugs.
3. One exciter unit.
6. Two high-tension igniter leads.

At what RPM is a reciprocating engine ignition switch check made?

What is the approximate position of the rotating magnet in a high-tension magneto when the points first close?

What component of a dual magneto is shared by both ignition systems?

What would be the result if a magneto breaker point mainspring did not have sufficient tension?

The secondary coil of a magneto is grounded through the

In the aircraft magneto system, if the P-lead is disconnected, the magneto will be

(Refer to Figure 5.) With power applied to the bus bar, what switch changes will allow the ignition exciters test switch to function?

(Refer to Figure 5.) The type of system depicted is capable of operating with

(Refer to Figure 5.) If wire No. 8 is broken or disconnected after starter rotation is initiated, and the power lever is advanced, the

(Refer to Figure 5.) When an external power source is connected to the aircraft,

The purpose of an under current relay in a starter-generator system is to

In a typical starter-generator system, under which of the following starting circumstances may it be necessary to use the start stop button?

(Refer to Figure 5.) Which malfunctions will allow the igniters to operate when tested but be inoperative during a start attempt?
1. Conductor No. 10 broken.

3. Ignition relay inoperative.

(Refer to Figure 5.) Which malfunctions will allow the igniters to operate normally during start but be inoperative when tested?

1. Conductor No. 14 broken.

3. Conductor No. 15 broken.

When using an electric starter motor, current usage

When using an electric starter motor, the current flow through it

The primary advantage of pneumatic (air turbine) starters over comparable electric starters for turbine engines is

A clicking sound heard at engine coast-down in a pneumatic starter incorporating a sprag clutch ratchet assembly is an indication of

Pneumatic starters are usually designed with what types of airflow impingement systems?

Inspection of pneumatic starters by maintenance technicians usually includes checking the

Air turbine starters are generally designed so that reduction gear distress or damage may be detected by

Airflow to the pneumatic starter from a ground unit is normally prevented from causing starter overspeed during engine start by

A safety feature usually employed in pneumatic starters that is used if the clutch does not release from the engine drive at the proper time during start is the

A safety feature usually employed in pneumatic starters that is used to prevent the starter from reaching burst speed if inlet air does not terminate on schedule is the

In the event a pneumatic start valve will not operate and the manual override must be used, the starter T-handle must be closed at scheduled starter drop out because