Ignition starting system pt. 2 ⭐️

78問 • 1年前

Marga

通報

問題一覧

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

When the breaker points are closed and the ignition switch is on.

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

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

Coarse grained

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

By use of cable-piercing screws.

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

The distributor turns at one-half crankshaft speed.

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

secondary coil

The purpose of staggered ignition is to compensate for

diluted fuel/air mixture around exhaust valve.

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

To reduce the effect of the high-frequency electromagnetic waves emanated during operation.

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

the breaker contacts to burn.

As an aircraft engines speed is increased, the voltage induced in the primary coil of the magneto

increases

A spark plugs heat range is the result of

its ability to transfer heat from the firing end of the spark plug to the cylinder head.

When using an electric starter motor, current usage

is highest at the start of motor rotation.

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

The high-intensity spark cleans the igniter.

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

some contain radioactive material.

Which of the following are included in a typical turbine engine ignition system? 1. Two igniter plugs. 2. Two transformers. 3. One exciter unit. 4. Two intermediate ignition leads. 5. Two low-tension igniter leads. 6. Two high-tension igniter leads.

1, 3, 6

A magneto ignition switch is connected

parallel to the breaker points.

Spark plugs are considered worn out when the

electrodes have worn away to about one-half of their original dimensions.

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

magnets are in the E-gap position.

Which of the following are distinct circuits of a high-tension magneto? 1. Magnetic. 2. Primary. 3. E-gap. 4. P-lead. 5. Secondary.

1, 2, 5

Which malfunctions will allow the igniters to operate when tested but be inoperative during a start attempt? 1. Conductor No. lo broken. 2. Conductor No. li broken. 3. Ignition relay inoperative. 4. Conductor No. 12 broken.

1 or 3

What is a result of ‘flashover’ in a distributor?

Conductive carbon trail

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

The system is normally de-energized as soon as the engine start.

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

opened

If staggered ignition timing is used, the

spark plug nearest the exhaust valve will fire first.

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

only while both the retard and advance breaker points are open.

(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. 2. Conductor No. lo broken. 3. Conductor No. 15 broken. 4. Conductor No. 12 broken.

1 or 3

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

The cam follower wear and/or breaker points wear.

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

Advance the spark and decrease its intensity.

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

To produce a momentary high rotational speed of the magneto.

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

A high-energy spark is required for ignition.

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

where the contact points open.

In reference to a Shower of Sparks ignition system, (1) the retard breaker points are designed to keep the affected ignition system operating if the advance breaker points should fail during normal engine operation (after start). (2) the timed opening of the retard breaker points is designed to prevent engine kickback during start. Regarding the above statements.

only No. 2 is true

Spark plug heat range is determined by

its ability to transfer heat to the cylinder head.

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

linear distance from the shell gasket seat to the end of the threads on the shell skirt.

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

is highest at the start of motor rotation.

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

The slowest possible RPM.

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

on regardless of ignition switch position.

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

either battery or external power.

Aircraft magneto housings are usually ventilated in order to

provide cooling and remove corrosive gases produced by normal arcing.

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

inspection of a magnetic chip detector.

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

high power-to-weight ratio.

(Refer to Figure 5.) With power applied to the bus bar, what wire supplies standby power to the starter relay contact?

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

the starter will overspeed at a given NA2.

Why do turbine engine ignition systems require high energy?

To ignite the fuel under conditions of high altitude and low temperatures.

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

A low-tension system uses a transformer coil near the spark plugs to boost voltage, while the high-tension system voltage is constant from the magneto to the spark plugs.

Capacitance after firing of a spark plug is caused by

the stored energy in the ignition shielded lead unloading after normal timed ignition.

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

Radial inward flow turbine and axial-flow turbine.

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

Improper gapping procedure.

The purpose of a safety gap in a magneto is to

protect the high-voltage winding from damage.

Capacitance after firing in most modern spark plugs is reduced by the

a built-in resistor in each plug.

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

drive shaft shear point.

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

rate of collapse of the magnetic field around the primary coil.

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

activation of a flyweight cutout switch.

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?

BOTH — 1,700 RPM, R — 0 RPM, L— 1,700 RPM, OFF — 0 RPM.

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

full register

Shielding is used on spark plug and ignition wires

prevent interference with radio reception.

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

do not require continuous operation.

Alignment 01 the marks provided or internal timing of a magneto indicates that the

magneto is in E-gap position.

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

magneto internally and the magneto to the engine.

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

Rotating magnet.

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

beginning to open

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

BOTH position

Defective spark plugs will cause the engine to run rough at

all speeds

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

Hard starting

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

A high-tension harness tester.

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

Insulator tip cracked.

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

Acetone

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

the pawls re-contacting and riding on the ratchet gear.

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. 4. Permits the use of lower grade fuels. 5. Increases the intensity of the spark at the spark plugs.

1, 2, 3

The electrical circuit from the magneto is completed by through the

engine structure

If the ground wire of a magneto is disconnected at the ignition switch, the result will be the affected magneto will be isolated and the engine will run on the

engine will not stop running when me ignition switch is turn off.

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

a rich mixture

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

induced when the primary circuit is interrupted.

Thermocouples are usually inserted or installed on the

hottest cylinder of the engine.

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

grounded

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

A cold plug is designed so that the insulator tip is reasonably short to hasten the rate of heat transfer from the tip through the sparkplug shell to the cylinder head.

If a spark plug lead becomes grounded, the

magneto will not be affected.

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

Just prior to spark plug firing.

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問題一覧

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

When the breaker points are closed and the ignition switch is on.

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

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

Coarse grained

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

By use of cable-piercing screws.

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

The distributor turns at one-half crankshaft speed.

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

secondary coil

The purpose of staggered ignition is to compensate for

diluted fuel/air mixture around exhaust valve.

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

To reduce the effect of the high-frequency electromagnetic waves emanated during operation.

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

the breaker contacts to burn.

As an aircraft engines speed is increased, the voltage induced in the primary coil of the magneto

increases

A spark plugs heat range is the result of

its ability to transfer heat from the firing end of the spark plug to the cylinder head.

When using an electric starter motor, current usage

is highest at the start of motor rotation.

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

The high-intensity spark cleans the igniter.

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

some contain radioactive material.

1, 3, 6

A magneto ignition switch is connected

parallel to the breaker points.

Spark plugs are considered worn out when the

electrodes have worn away to about one-half of their original dimensions.

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

magnets are in the E-gap position.

Which of the following are distinct circuits of a high-tension magneto? 1. Magnetic. 2. Primary. 3. E-gap. 4. P-lead. 5. Secondary.

1, 2, 5

1 or 3

What is a result of ‘flashover’ in a distributor?

Conductive carbon trail

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

The system is normally de-energized as soon as the engine start.

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

opened

If staggered ignition timing is used, the

spark plug nearest the exhaust valve will fire first.

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

only while both the retard and advance breaker points are open.

1 or 3

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

The cam follower wear and/or breaker points wear.

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

Advance the spark and decrease its intensity.

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

To produce a momentary high rotational speed of the magneto.

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

A high-energy spark is required for ignition.

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

where the contact points open.

only No. 2 is true

Spark plug heat range is determined by

its ability to transfer heat to the cylinder head.

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

linear distance from the shell gasket seat to the end of the threads on the shell skirt.

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

is highest at the start of motor rotation.

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

The slowest possible RPM.

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

on regardless of ignition switch position.

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

either battery or external power.

Aircraft magneto housings are usually ventilated in order to

provide cooling and remove corrosive gases produced by normal arcing.

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

inspection of a magnetic chip detector.

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

high power-to-weight ratio.

(Refer to Figure 5.) With power applied to the bus bar, what wire supplies standby power to the starter relay contact?

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

the starter will overspeed at a given NA2.

Why do turbine engine ignition systems require high energy?

To ignite the fuel under conditions of high altitude and low temperatures.

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

A low-tension system uses a transformer coil near the spark plugs to boost voltage, while the high-tension system voltage is constant from the magneto to the spark plugs.

Capacitance after firing of a spark plug is caused by

the stored energy in the ignition shielded lead unloading after normal timed ignition.

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

Radial inward flow turbine and axial-flow turbine.

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

Improper gapping procedure.

The purpose of a safety gap in a magneto is to

protect the high-voltage winding from damage.

Capacitance after firing in most modern spark plugs is reduced by the

a built-in resistor in each plug.

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

drive shaft shear point.

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

rate of collapse of the magnetic field around the primary coil.

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

activation of a flyweight cutout switch.

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?

BOTH — 1,700 RPM, R — 0 RPM, L— 1,700 RPM, OFF — 0 RPM.

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

full register

Shielding is used on spark plug and ignition wires

prevent interference with radio reception.

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

do not require continuous operation.

Alignment 01 the marks provided or internal timing of a magneto indicates that the

magneto is in E-gap position.

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

magneto internally and the magneto to the engine.

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

Rotating magnet.

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

beginning to open

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

BOTH position

Defective spark plugs will cause the engine to run rough at

all speeds

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

Hard starting

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

A high-tension harness tester.

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

Insulator tip cracked.

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

Acetone

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

the pawls re-contacting and riding on the ratchet gear.

1, 2, 3

The electrical circuit from the magneto is completed by through the

engine structure

If the ground wire of a magneto is disconnected at the ignition switch, the result will be the affected magneto will be isolated and the engine will run on the

engine will not stop running when me ignition switch is turn off.

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

a rich mixture

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

induced when the primary circuit is interrupted.

Thermocouples are usually inserted or installed on the

hottest cylinder of the engine.

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

grounded

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

A cold plug is designed so that the insulator tip is reasonably short to hasten the rate of heat transfer from the tip through the sparkplug shell to the cylinder head.

If a spark plug lead becomes grounded, the

magneto will not be affected.

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

Just prior to spark plug firing.