IGNITION AND STARTING PART 2

Which of the following statements regarding magneto switch circuits is NOT true?. In the BOTH position, the right and left magneto circuits are grounded. In the OFF position, neither the right nor left magneto circuits are open. In the RIGHT position, the right magneto circuit is open and the left magneto circuit is grounded.

The amount of voltage generated in any magneto secondary coil is determined by the number of windings and by the. rate of buildup of the magnetic field around the primary coil. rate of collapse of the magnetic field around the primary coil. amount of charge released by the capacitor.

The spark is produced in a magneto ignition system when the breaker points are. fully open. beginning to open. fully closed.

What would be the result if a magneto breaker point mainspring did not have sufficient tension?. The points will stick. The points will not open to the specified gap. The points will float or bounce.

The electrical circuit from the spark plug back to the magneto is completed by grounding through the. engine structure. P-lead. cockpit switch.

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?. Breaker cam. Engine crankshaft. Distributors.

The capacitor-type ignition system is used almost universally on turbine engines primarily because of its high voltage and. low amperage. long life. high-heat intensity.

Spark plug fouling caused by lead deposits occurs most often. during cruise with rich mixture. when cylinder head temperatures are relatively low. when cylinder head temperatures are high.

What component of a dual magneto is shared by both ignition systems?. High-tension coil. Rotating magnet. Capacitor.

The greatest density of flux lines in the magnetic circuit of a rotating magnet-type magneto occurs when the magnet is in what position?. Full alignment with the field shoe faces. A certain angular displacement beyond the neutral position, referred to as E-gap angle or position. The position where the contact points open.

Capacitance afterfiring in most modern spark plugs is reduced by the use of. fine wire electrodes. a built-in resistor in each plug. aluminum oxide insulation.

What components make up the magnetic system of a magneto?. Pole shoes, the pole shoe extensions, and the primary coil. Primary and secondary coils. Rotating magnet, the pole shoes, the pole shoe extensions, and the coil core.

When internally timing a magneto, the breaker points begin to open when the rotating magnet is. fully aligned with the pole shoes. a few degrees past full alignment with the pole shoes. a few degrees past the neutral position.

When timing a magneto internally, the alignment of the timing marks indicates that the. breaker points are just closing. magnets are in the neutral position. magnets are in the E-gap position.

How does high-tension ignition shielding tend to reduce radio interference?. Prevents ignition flashover at high altitudes. Reduces voltage drop in the transmission of high-tension current. Receives and grounds high-frequency waves coming from the magneto and high-tension ignition leads.

Which of the following would be cause for rejection of a spark plug?. Carbon fouling of the electrode and insulator. Insulator tip cracked. Lead fouling of the electrode and insulator.

What is the purpose of using an impulse coupling with a magneto?. To absorb impulse vibrations between the magneto and the engine. To compensate for backlash in the magneto and the engine gears. To produce a momentary high rotational speed of the magneto.

What is the difference between a low-tension and a high-tension engine ignition system?. A low-tension system produces relatively low voltage at the spark plug as compared to a high-tension system. A high-tension system is designed for high-altitude aircraft, while a low-tension system is for low- to medium-altitude aircraft. 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.

Which of the following breaker point characteristics is associated with a faulty capacitor?. Crowned. Fine grained. Coarse grained.

Why are turbine engine igniters less susceptible to fouling than reciprocating engine spark plugs?. The high-intensity spark cleans the igniter. The frequency of the spark is less for igniters. Turbine igniters operate at cooler temperatures.

Aircraft magneto housings are usually ventilated in order to. prevent the entrance of outside air which may contain moisture. allow heated air from the accessory compartment to keep the internal parts of the magneto dry. provide cooling and remove corrosive gases produced by normal arcing.

Why are high-tension ignition cables frequently routed from the distributors to the spark plugs in flexible metallic conduits?. To eliminate high altitude flashover. To reduce the formation of corona and nitric oxide on the cable insulation. To reduce the effect of the high-frequency electromagnetic waves emanated during operation.

In a turbine engine DC capacitor discharge ignition system, where are the high-voltage pulses formed?. At the breaker. At the triggering transformer. At the rectifier.

What will be the effect if the spark plugs are gapped too wide?. Insulation failure. Hard starting. Lead damage.

When a 'Shower of Sparks' ignition system is activated at an engine start, a spark plug fires. as soon as the advance breaker points open. only while both the retard and advance breaker points are closed. only while both the retard and advance breaker points are open.

In order to turn a magneto off, the primary circuit must be. grounded. opened. shorted.

In reference to a 'Shower of Sparks' ignition system,. 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). the timed opening of the retard breaker points is designed to prevent engine "kickback" during start. the timed opening of the retard breaker points is designed to allow engine "kickback" during start.

When a magneto is operating, what is the probable cause for a shift in internal timing?. The rotating magnet loses its magnetism. The distributor gear teeth are wearing on the rotor gear teeth. The cam follower wear and/or the breaker points wear.

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

In a low-tension ignition system, each spark plug requires an individual. capacitor. breaker assembly. secondary coil.

Air turbine starters are generally designed so that reduction gear distress or damage may be detected by. characteristic sounds from the starter assembly during engine start. breakage of a shear section on the starter drive shaft. inspection of a magnetic chip detector.

Which of the following statements most accurately describes spark plug heat range?. The length of the threaded portion of the shell usually denotes the spark plug heat range. A hot plug is designed so that the insulator tip is reasonably short to hasten the rate of heat transfer from the tip through the spark plug shell to the cylinder head. 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 spark plug shell to the cylinder head.

(Refer to Figure 5.) Which malfunctions will allow the igniters to operate when tested but be inoperative during a start attempt?. Wire 12 and 11 are broken. Wire 11 is broken and/or the ignition relay is inoperative. Wire 10 is broken and/or the ignition relay is inoperative.

Why do turbine engine ignition systems require high energy?. To ignite the fuel under conditions of high altitude and high temperatures. Because the applied voltage is much greater. To ignite the fuel under conditions of high altitude and low temperatures.

As an aircraft engine's speed is increased, the voltage induced in the primary coil of the magneto. remains constant.. increases. varies with the setting of the voltage regulator.

A defective primary capacitor in a magneto is indicated by. a fine-grained frosted appearance of the breaker points. burned and pitted breaker points. a weak spark.

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

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. faulty or fouled spark plugs. incorrect ignition timing on both magnetos. one or more dead cylinders.

When the ignition switch of a single (reciprocating) engine aircraft is turned to the OFF position,. the primary circuits of both magnetos are grounded. the secondary circuits of both magnetos are opened. all circuits are automatically opened.

What is the purpose of a safety gap in some magnetos?. To discharge the secondary coil's voltage if an open occurs in the secondary circuit. To ground the magneto when the ignition switch is off. To prevent flashover in the distributor.

When does battery current flow through the primary circuit of a battery ignition coil?. Only when the breaker points are open. At all times when the ignition switch is on. When the breaker points are closed and the ignition switch is on.

When the switch is off in a battery ignition system, the primary circuit is. grounded. opened. shorted.

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. breaker points to the cylinder 1. magneto drive to the engine.

Igniter plugs used in turbine engines have a long service life because they. have a high intensity spark. operate continuously with a lower spark. do not require continuous operation.