week 8

Question 1

Ignition system only works when?

Answer 1

Engine Start and for certain In-flight conditions

Question 2

important characteristic of a gas turbine ignition system

Answer 2

high energy discharge at the igniter plug

Question 3

Ignition units are rated in?

Answer 3

Joules

Question 4

the larger the engine, the larger the?

Answer 4

Ignition Unit Rating

Question 5

A large turbofan engine may have ignition ratings of ?

Answer 5

16 joules or more

Question 6

A smaller engine may have ignition ratings of?

Answer 6

4-6 joules

Question 7

Larger turbine engines will have one ignition exciter per?

Answer 7

Igniter Plug

Question 8

Ignition exciters can be classified as?

Answer 8

Intermittent or Continuous Duty

Question 9

Modern ignition systems use a __ ___ exciter that produces less heat than older models. modern systems are more likely to be considered ____ _____

Answer 9

Solid state, Continuous Duty

Question 10

What does the Bleed Resistor do?

Answer 10

1. Dissipates excess voltage beyond what the igniter plug needs to fire. This allows the plug to fire at the lowest possible voltage. (Typ. 2 joules when igniter is new)
2. Provides a discharge path for energy if the system is fired when no igniter plug is installed.
3. Bleeding off the capacitor charge when the system is de-energized.

Question 11

Some smaller gas turbine engines may use __ ___ instead of igniters.

Answer 11

Glow plugs

Question 12

designed to provide automatic ignition when engine torque or power falls too low. This system ensures ignition during takeoff, landing, turbulence, and during adverse conditions of icing weather

Answer 12

Auto-Ignition System