15.13 start and ignition

Question 1

what are the methods of start for an engine?

Answer 1

electric power
gas
hydraulic pressure

Question 2

what is possible for maintenance purposes?

Answer 2

motor the engine over without ignition ‘dry run’

Question 3

what will happen to exhaust gas temps during start up?

Answer 3

slight overshoot

Question 4

what occurs first ignition or fuel injection?

Answer 4

ignition

Question 5

how is the compressor and fan started?

Answer 5

starter motor

Question 6

what disengages the starter motor?

Answer 6

a spring clutch operating centrifugally (sprug)

Question 7

what is the principle of cartridge starting?

Answer 7

an impulse type turbine that is driven by high velocity gases from a burning cartridge

Question 8

what air is required for an air starter?

Answer 8

30-50lbs per square inch

Question 9

what is important about starter motor oil?

Answer 9

it has a sight plug
and a magnetic drain plug

Question 10

how can the starter motor be disengaged manually?

Answer 10

manual override

Question 11

what are the two types of electric starter?

Answer 11

direct cranking electrical system
starter generator system

Question 12

what are the characteristics of the direct cranking electric motor?

Answer 12

-DC electric motor
-coupled with an electric gearbox & ratchet/ clutch
-used on small engines/ Apu’s

Question 13

how does a starter generator system differ?

Answer 13

-it becomes generator through a secondary set of windings
-it does not disengage
-economically advantageous

Question 14

how long is ignition activated?

Answer 14

only for a short period

Question 15

when can continuous ignition be used?

Answer 15

when there is a risk of flame out

Question 16

what is important when continuous ignition is occuring?

Answer 16

cooling

Question 17

what are the two types of ignition systems?

Answer 17

capacitor
electronic

Question 18

what powers the ignition system?

Answer 18

115AC
permanent magnetic generator

Question 19

what does a typical ignition system have?

Answer 19

two exciters
two transponders
two intermediate ignition leads

Question 20

how is flashover limited?

Answer 20

it is hermetically sealed

Question 21

where is the energy sealed in a capacitor discharge exciter box?

Answer 21

in the capacitor

Question 22

what is another name for an annular gap igniter?

Answer 22

a long reach igniter

Question 23

how does a constrained gap plug differ?

Answer 23

it does not protrude into the liner