Jeppesen Oral- Chapter 8 (Electrical, Starting and Ignition Systems) Flashcards
By visually inspecting the amount of wear groove remaining on the brushes.
Commutator and brushes should be checked for wear
both
GPU, APU, bleed air from running engine
A specific number of degrees before TDC on the compression stroke
It produces a high voltage that forces a spark to arc across the electrodes at the sparkplug end
Permanent magnet, soft iron core, laminated pole shoes, primary and secondary windings, coondensor, contact breakers, on/off switch, primary and ground leads, distributor,
- Magnetic circuit 2. Primary circuit 3. Secondary circuit
A point a few degrees past the neutral position of rotating magnet where maximum magnetic stress exist
condenser
When the magneto is in E-gap, the contact breakers open which abruptly interupts the current flow in the primary circuit, causing high flux change rate, inducing high voltage in secondary coil
connects the ignition switch to the primary circuit. When ignition switch is turned off, both leads are grounded. When the ignition switch is turned to the left, the right is grounded and vice-versa
Use for both internal and engine timing, indicates exact position of E-gap
High energy sparks clean off any deposits
Allows operation of the ignition system for given amount of time followed by minimum cooling down period
exciters, high tension leads, ignitors
- Indicates whether the battery is charging or discharging 2. Indicates the current produced by generator or electrical system load
The generators are paralled
on the data plate attached to the generator
By varying the field current strength
Three phase, rotating field
By regulating the voltage output of the DC exciter
Frequency of output
Constant speed drives, IDG and VSCF
armature, field, brushes and frame assembly
An electric motor, reduction gears and an automatic engaging/ disengaging mechanism
Series, Shunt, compound
Series wound motor, high starting torque under heavy load conditions
Operates as a starter first, than as a generator once the engine is running
Dirty or worn commutator
Exhaust areas or heating ducts
AWG
By number gauges. Smaller wires have larger numbers. 22 is the smallest
Not over 1 inch
Prevent static discharge
