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2AX5X Vol 2 Unit 2
56 Self Test Questions
| Question | Answer |
|---|---|
| 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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