A/C Electrical
Some electrical motors have two sets of field windings wound in opposite directions, so that the?
The motor can be operated in either direction
The starting current of a series-wound DC motor, in passing through both the field and armature windings, produces a?
High starting torque
If the reverse current cutout relay contact points fail to open after the generator output has dropped below battery potential, current will flow through the generator armature?
opposite the normal direction and through the shunt field in the normal direction
What are the 2 main causes of a cylinder having low compression?
Piston rings not seating or broken and valves not seating or burnt.
Static inverters are electronic devices that change DC to AC with the?
use of an oscillator
What record must be made when a major repair to an aircraft structure is done?
FAA Form 337
If a generator is equipped with a vibrator-type voltage regulator, what is the actual time the voltage regulator points remain open?
Depends on the load carried by the generator
The only practical method of maintaining a constant voltage output from an aircraft generator under varying conditions of speed and load is to vary the?
Strength of the magnetic field
A series-wound DC electric motor will normally require
More current at low RPM than at high RPM
What color and marking identify the fluid lines that carry the fire extinguishing agent in an aircraft?
Brown tape with a series of Diamonds on it.
What type of instrument is used for measuring very high values of resistance?
Megohmmeter
Where can a mechanic find a list of major alterations that have been made and approved for FAA-certificated aircraft?
In the Summary of Supplemental Types Certificates.
What is the principal advantage of the series-wound DC motor?
High starting torque
The method most often used in overcoming the effects of armature reaction is through the use of
Interpoles
In a generator, what eliminates any possible sparking to the brush guides caused by the movement of the brushes within the holder?
The brush pigtail
What could likely cause the pointer of a magnetic drag tachometer to oscillate?
Dry cable connecting the indicator to the engine or kink in the cable housing
Electric wire terminals for most aircraft applications must be what type?
Ring
Where in the regs can a mechanic find a list of items that must be inspected during an annual or 100-hour inspection?
14 CFR Part 43 Appendix D
What is the cause of generator brush arcing?
Low spring tension
The pole pieces or shoes used in a DC generator are a part of the
field assembly
The commutator of a generator changes alternating current produced in the armature into direct current as it is taken from
the armature
In what position should the ignition switch be placed when using a timing light on the magnetos?
In the "both" position
Who is pictured on the back of an A&P cert?
Charlie Taylor
When temporary fuel tanks are installed in aircraft. The third must be attached to the tanks inside the aircraft.
One purpose of a growler test is to determine the presence of?
A shorted armature
Which motor would be most likely to have an armature brake?
Landing light retraction motor
How does the magnetic brake used to stop the rotation of an electric motor armature operate?
A friction brake is applied by a spring and released by a magnet
What is specific fuel consumption (SFC)?
The measure of the economical use of fuel.
A battery-generator system provides direct current. On installations requiring alternating current from the battery-generator system, it is necessary to have
an inverter
Who is authorized to perform an annual inspection on an aircraft?
A certificated A&P with an IA