AMT Reciprocating Engine Ignition Systems 2

Question 1

What is the primary purpose of the impulse coupling on a magneto?

Accepted Answer

Provide a retarded and intensified spark during engine starting

Answer

Increase magneto output voltage at high RPM

Answer

Reduce magneto speed to match crankshaft speed

Answer

Protect the magneto from voltage spikes

Question 2

Which ignition system component prevents a spark plug from firing at the incorrect time due to residual magnetism?

Accepted Answer

Condenser

Answer

Primary coil

Answer

Breaker points

Answer

Distributor rotor

Question 3

On a dual-magneto ignition system, the 'BOTH' position on the ignition switch is used during normal flight because it:

Accepted Answer

Reduces fuel consumption by providing complete combustion

Answer

Allows crosschecking of magneto operation in flight

Answer

Is required by FAA regulation at all times

Answer

Prevents spark plug fouling from lead deposits

Question 4

A magneto's 'E-gap' refers to the position of the rotating magnet when:

Accepted Answer

Magnetic flux through the coil core is changing most rapidly

Answer

The breaker points are fully closed

Answer

The distributor finger aligns with the next electrode

Answer

The magneto reaches its maximum RPM

Question 5

What type of spark plug would most likely be used in a high-compression aircraft engine to resist fouling?

Accepted Answer

Short-reach, cold heat range plug

Answer

Long-reach, cold heat range plug

Answer

Short-reach, hot heat range plug

Answer

Long-reach, hot heat range plug

Question 6

During a magneto check at runup, a drop of more than the manufacturer's specified RPM when switching to one magneto indicates:

Accepted Answer

A possible defective magneto or fouled spark plug on that side

Answer

Normal single-magneto operation

Answer

The need to adjust ignition timing

Answer

Excessive advance in the magneto timing

Question 7

Which of the following describes correct procedure when grounding a magneto for maintenance?

Accepted Answer

Connect the P-lead to aircraft structure to disable ignition output

Answer

Remove the magneto coil from the housing before any work

Answer

Disconnect the high-tension leads and leave P-lead connected

Answer

Short the secondary coil to the magneto case