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2W1 A set CDCs book3
URE questions from book 3
Question | Answer |
---|---|
(401) Which of the following correctly reflects basic atomic particle placement in an atom | Protons and neutrons in the nucleus with electrons in orbit |
(401) An electrically unbalanced atom is called | an ion |
(401) Magnetism is defined as an invisible force with the ability to accomplish | mechanical work |
(401) Haphazard alignment of the individual molecules causes the effects of their magnetic poles to | cancel out |
(401) Magnetic lines of force never | cross; they bend |
(402) Which of the following substances is an insulator | Glass |
(402) A good conductive material | has electrons bound loosely to the nucleus |
(402) What is the unit of measure for movement of electrons through a conductor | Amp |
(402) What does the term current refer to | Quantity of electrons flowing past a given point during 1 second |
(402) What is the unit of measurement for resistance to current flow | Ohm |
(402) Any time that a conductor serves as the path for electrons to flow, it | develops a magnetic field |
(402) What effect does arranging the conductor into a coil have on the magnetic lines of force | They are concentrated |
(402) What effect will increasing the current have on an electro magnet | Strengthens the magnetic field |
(403) Which component of a battery generates the negative charge during operation | Anode |
(403) Which component of a battery generates the positive charge during operation | Cathode |
(403) The flow of electrons in a battery is always from the | anode to the cathode |
(403) If a conductor is passed through a magnetic field so that it will pass through the magnetic lines of force, it will generate | electrical current |
(403) In a generator, the electrons in the conductor will be drawn towards the side of the coil that is closest to the | north pole of the magnetic field |
(403) Static electricity refers to | electricity at rest |
(403) When an object gains or loses a large amount of electrons, scientists say it possesses a | static charge |
(403) The conductivity of some insulating materials is increased by the absorption of | moisture under high-humidity conditions |
(404) What electrical component is designed to offer a predetermined amount of opposition to current flow in a circuit | Resistor |
(404) The actual value of carbon-composition resistors can vary from | 5 to 20 percent |
(404) A three-terminal variable resistor is a | potentiometer |
(405) What are the two basic components of a switch | Contacts and actuators |
(405) What is the moveable part of the switch that is manipulated to complete or open the electrical circuit or circuits to allow or inhibit the flow of electrons | Actuator |
(405) What type of manual switch contains a spring or some other restoring force that returns the actuator to a certain position | Biased |
(406) What type of circuit breaker is opened by a coil when the current exceeds the values set at the factory | Magnetic |
(406) What type of circuit breaker is opened by a bimetallic strip when excess current is experienced in a circuit | Thermal |
(406) Which type of circuit breaker can be opened as well as closed by the operator | Switch-type thermal circuit breaker |
(406) What is included on push-pull type circuit breakers to indicate an open condition | Colored indicator collar |
(407) An electrical device used to mechanically switch electrical circuits is a | relay |
(407) Relays are made to operate on a | small amount of current |
(407) What kind of relay has two de-energized states | Latching |
(407) Reed relays filled with inert gas to | prevent corrosion |
(407) What is the movable part of a solenoid called | Plunger |
(407) What restores a solenoid to its de-energized state | Spring |
(408) What three components are found in all circuits | Power source, load, and conductor |
(408) Which type of wiring diagram is appropriate for large or complicated circuits | Schematics |
(408) In a schematic diagram push button switches are shown in their normal or | biased positions |
(409) How do you check electrical equipment before testing and following repair actions | Visually |
(409) You must visually inspect equipment before testing and following repair actions to | check for obvious defects |
(409) Which technical order contains inspection and repair information that applies across all aircraft wiring systems | 1-1A-14 |
(409) When cleaning electrical equipment, use | only approved cleaning solvents |
(409) When do you use compressed air for cleaning electrical equipment | Only as a last resort |
(410) What is chafing | Constant friction (rubbing) between wiring harnesses and the structure to which they are attached |
(410) What is the most obvious indication of chafing | Exterior damage to cables |
(410) To prevent chafing, the slack in a wiring harness between two support points normally should not exceed | 1/2 inch |
(410) Which of the following conditions is a form of chafing | Loose-fitting clamps |
(410) What is the only real cure for wire chafing problems | Following proper maintenance procedures |
(411) A coaxial cable is protected on the outside by a | tough outer jacket |
(411) What is the primary reason you must take care to never step on a coaxial cable, set anything heavy on it, or bend it sharply | Flattens the cable and will change its electrical characteristics |
(411) When installing a connector on a coaxial cable, you must use care starting the braid clamp nut to prevent | cross-threading |
(412) Who should accomplish electrical repairs | Qualified personnel only |
(412) As a rule, electrical items should | have maintenance performed with power off |
(412) Maintenance on energized circuits requires a safety observer if the voltage applied to an item exceeds | 300 volts |
(412) When performing measurements on energized circuits, meters should | not be held in your hand |
(412) When voltage is applied to equipment being repaired, | all nonessential tools should be removed |
(413) What device is used to cover or protect the exposed wire access are between the rear of a connector and the end of the bundle braid on cable assemblies or wire bundles | Protective boot |
(413) What must be done to a salvaged protective boot before re-installation | Cleaned with a solvent and then coated with an adhesive when thoroughly dry |
(413) What do you use to make a spot tie on protective boots during installation | Dacron lacing tape |
(413) When shrinking a protective boot for wiring, work slowly from the | connector to the braid end |
(413) What is the only heat guns presently authorized around fueled aircraft | Compressed air/nitrogen heat gun kit |
(413) When using self-bonding silicone tape to repair damaged bundle braid, how much overlap must you maintain during the wrapping procedure | 50% |
(413) What do you use to make a spot tie on silicone tape when repairing a wire braid | Dacron lacing tape |
(413) The indicating band on the working end of a solderless connector insertion tool determines the | correct depth to insert the tool |
(413) What is the primary reason that you must never use pin insertion tools with burrs or sharp edges | They can cut through the grommet wire sealing webs and destroy the environmental sealing capabilities of a connector |
(413) You can tell if a solderless connector contact is completely released and pushed out of the connector because the extraction tool will bottom against the | connector face |
(414) What are two operational modes of the Fluke 8025A multimeter | Range and hold |
(414) To return the Fluke 8025A meter to the automatic mode, you must depress the RANGE push botton for | more than 1 second |
(415) What are the three general types of electrical troubles that develop in electrical circuits | Open, short, and grounded circuits |
(415) What type of electrical problem will most likely result if a wire breaks from a switch | a shorted circuit |
(415) A short across a series component usually produces | larger than normal current flow in the circuit |
(415) Accidental contact between a positive lead and the aircraft or component structure of a frame is called | a grounded out circuit |
(415) What must the technician use to remove excess flux after making a solder joint | Alcohol |
(415) What is the expected result if the soldering iron is not hot enough when contact is made to transfer sufficient heat to the component being soldered | The solder will "set" before it fuses with the material being joined causing a weaker than expected joint |
(415) What is a rosin joint | Joint where the flux (and not the solder) binds the joint leaving it not electrically solid |
(416) A good fuze or circuit breaker in a malfunctioning circuit normally indicates | an open in the circuit |
(416) If for some reason, the fuze in a circuit blows or burns out, it is an indication that you have | a short to ground in the circuit |
(417) When testing a diode, how many measurements must you take | Two |
(417) When taking resistance measurements on a diode, the larger reading indicates | reverse-bias resistance |
(417) A standard diode used in a rectifier should have a reverse bias to forward bias ratio of | 10 to 1 |
(418) Troubleshooting is a | systematic approach to finding a fault |
(418) What are job guides | Step-by-step operational procedures |
(418) Where do you find troubleshooting trees | Job guides |
(419) How many levels of electrostatic discharge components are there | Two |
(419) What is the sensitivity range of level 1 electrostatic discharge components | 0 to 16,000 volts |