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2AX5X Vol 2 Unit 2

56 Self Test Questions

Define electricity. A class of physical phenomena arising from the existence and interactions of electric charges
Of what particles are atoms composed? Neutrons, protons, and electrons
List four examples of insulators. Wood, rubber, plastic, and glass
List four examples of conductors. Platinum, gold, copper, and silver
Where do you normally use semiconductors? In solid-state devices
What is EMF? Electromotive force: the electrical pressure that causes electrons to flow through the conductor.
Define electrical current. The movement of electrons through a conductor
What factors affect the amount of resistance in a conductor? The type of material used, temperature, size
What unit of measurement is used to express electrical power? Watts
What is a simple definition of magnetism? The ability of a substance to attract
How are artificial magnets classified? Permanent or temporary
What is permeability? The ease of ability to conduct magnetic lines of force
What is residual magnetism? The amount of magnetism that remains in a temporary magnet
How is magnetism induced in magnetic material? Place in a magnetic field or bring it into contact with another magnet
Can magnetic lines of force be insulated? No
What are the three most commonly used shapes of magnets? Bar, ring, and horseshoe
How can a magnet be weakened? Heating or excessive jarring
Define flux. A term for magnetic lines of force
How is electromagnetism developed? By current of electricity
When current flows through a conductor, does a magnetic field exist? Yes
What must you know to apply the "left hand rule"? The direction of the current flow
What rule do you use to determine the flux direction of a wire in a loop? The left-hand rule
How can an electromagnet's field strength be increased? By using a few turns of wire carrying a larger current or using many turns of wire carrying a small current
What is the purpose of a conductor? Provide a path for electrons to flow with minimum resistance
Why are protective devices installed in aircraft electrical systems? Protect against system overloads and shorts in a circuit
How much time must pass before resetting a trip-free type circuit breaker? After a cooling off period of approximately 1 minute
What is the purpose of a current limiter? Provide protection against fault currents
What is the purpose of a resistor? Control the amount of current flow in a circuit
Why is alternating current used as the primary electrical power source in aircraft? Less power is lost during transmission and the elimination of insulation and brushes
What is the unit of measurement for frequency? Hertz
Define phase relationship. A condition in which two moving objects are changing in, or out, of step
What are the two classifications of AC generation systems? Variable-frequency and constant-frequency
What frequency is used for AC power generation on aircraft? 400 hertz
How is voltage induced in a brush-type generator? DC from an integral exciter generator is passed through windings on the rotor
What are the three generators that make up a brushless AC generator? A permanent magnet generator, an AC exciter generator, and the main AC generator
What weak point was eliminated by the design of a brushless-type generator? Arcing (which more easily occurs in rarefied air)
What are the two main components of an AC generator? Rotor assembly and stator
What three components make up the stator? PMG armature, exciter field, and main armature windings
What are the two functions of the CSD governor system? To control the drive output speed and equalize the load between generators operating in parallel
If CSD output rotation drives the generator below 365 Hz, what component removes the generator from the bus? Underspeed switch
If the CSD temperature rises to an overheat condition, what should be done to prevent further damage? Disconnect the CSD
What is installed on most IDGs to provide for easier installation and removal? A quick attach-detach clamp
What are the typical functions of a GCU? Voltage regulation, frequency and load control, real and reactive load division, over/underexcitation protection, over/underfrequency protection, open phase protection, reverse power protection, differential current protection, engine underspeed protect
How is voltage regulation and current limiting accomplished in the GCU? By varying the generator excitation field
How does the frequency and load controller for each generator system regulate the frequency of the generator CSD? By controlling the magnetic trim head governor on the CSD
What are the internal components of a battery? Plates, separators, and electrolyte
What are the primary causes of premature failure of a lead-acid battery? Abuse, overcharge, low solution, undercharge, and mountings
What is the fundamental unit of the nickel-cadmium battery? The cell
How are nickel-cadmium cells constructed? By inserting positive and negative plates in plastic cases with nylon and cellophane separators
When does a nickel-cadmium battery's electrolyte reach its maximum level? When the battery is fully charged
How are motors classified? By voltage, current used (AC or DC), and methods of motor excitation
How can the direction of rotation for a series motor be changed? By reversing the current flow in a field winding or the armature
What advantage does the series motor have over other types of motors? It operates on AC or DC excitation
How is the field winding of a shunt motor connected with the armature? In parallel
What type of T-R is used to charge a nickel-cadmium battery in many aircraft? Charging T-R
What is another name for a T-R? Converter
Created by: Fah_Q



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