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ASA
| Basic unit of voltage | VOLT |
| Basic unit of current | AMP |
| Basic unit of resistance | OHM |
| Which law of electricity is most important | Ohm's Law |
| What are the three elements in Ohm's Law | voltage, current, resistance |
| Five sources of electrical energy | Magnetism, chemical energy, light, heat, pressure |
| Four things affecting resistance of an electrical conductor | Material, Cross-sectional area, Length, Temperature |
| Defining resistance of a composition resistor | By series of colored bands around one end of the resistor |
| Three things all electrical circuits contain | SOURCE of electrical energy, LOAD to use the energy, CONDUCTORS to join source and load |
| Purpose of a capacitor | To store electrical energy in electrostatic fields |
| Basic unit of capacitance | farad |
| Why should electrolytic capacitors not be used in an AC circuit? | Because they are polarized; the electrolytic capacitor will pass current of one polarity but block current of opposite polarity |
| Define inductance | The ability to store electrical energy in electromagnetic fields |
| Basic unit of inductance | Henry |
| Define impedance | Total opposition to the flow of alternating current; the vector sum of resistance, capacitive reactance, and inductive reactance |
| How to find the polarity of an electromagnet | "Left Hand Rule" hold the electromagnet in your left hand with fingers encircling the coil in the direction the electrons flow. the thumb will point to the north end of the electromagnet |
| Unit of impedance | ohms |
| Basic unit of power in DC circuit | Watt |
| What is a kilowatt? | 1,000 watts |
| What happens to the current in a DC circuit if voltage increase but resistance remains the same? | current increases |
| Three types of DC circuits | Series, Parallel, Series-Parallel (Complex) |
| How many cells in a 24-volt lead acid battery | 12 |
| Specific gravity of the electrolyte in a fully charged lead-acid battery | 1.275 - 1.300 |
| What is the range of temperature of the electrolyte in a lead acid battery that does NOT require a correction when measuring SG? | 70-90 degrees Fahrenheit |
| What instrument is used to measure SG of electrolytes in a lead acid battery? | Hydrometer |
| How is lead acid battery compartment treated to protect against corrosion? | Painted with asphaltic (tar base) paint or polyurethane enamel |
| What neutralizes spilled electrolyte from lead acid battery | bicarbonate of soda (baking soda) and water |
| Electrolyte level in a properly serviced lead acid battery | Up to the indicator level in the cell |
| Precautions to take in a maintenance shop servicing lead acid battery and nickel-cadmium batteries | Batteries should be kept separate and tools used should not be cross contaminated |
| Why is a hydrometer not used to measure a state of charge of a nickel-cadmium battery? | Electrolyte in a nickel cadmium battery does not enter into a chemical change when a battery is charged or discharged. |
| What neutralizes a spill from a nickel cadmium battery? | boric acid and water |
| Define electromagnetic induction | transfer of electrical energy from one conductor to another not electrically connected |
| How many ohms in a megohm? | one million (1,000,000 ohms) |
| How many amps in a milliamp? | one thousandth (0.001 amps) |
| Define tolerance in an aircraft drawing | allowable plus (+) or minus (-) variation from given dimension |
| Define clearance in an aircraft drawing | amount of space/separation allowed between two components or parts |
| Information given in title block of an aircraft drawing | - name and address of company who made the part - name of part - scale of drawing - name of draftsman - name of approving engineer - number of part (drawing number) |
| How are dimensions shown on aircraft drawing | by numbers in break of dimension line |
| How to know which version is most current of a drawing | by number in revision block and by log of most recent drawing |
| How many views in an orthographic projection | Six |
| How many views to show most objects | Three |
| Purpose of a center line | Line that shows the center of an object |
| Define fuselage station number | distance in inches from the datum measured along the longitudinal axis of the fuselage |
| Where is the title block located on an aircraft drawing | lower right hand corner of the drawing |
| Purpose of cutting plane | Shows where an object has been cut to allow an auxiliary drawing to be made. The arrows on a cutting plane shows direction auxiliary drawing is viewed |
| How is alternate position of a part shown | By thin line made up of series of long dashes separated by two short dashes |
| Where must a record be kept of current empty weight and CG? | aircraft flight manual or weight and balance records required by 14CFR23(.1583) |
| Define datum for weight and balance computations | readily identified reference chosen by aircraft manufacturer which all longitudinal locations on aircraft are referenced |
| Why are all distances of items installed measured from the datum | makes it possible to find the point where the aircraft balances (CG) |
| Two reasons weight and balance control are important | safety of flight and most efficient performance |
| Define moment in computation of weight and balance | A force that tends to cause rotation. Product of weight of an object in pounds and distance from the datum in inches (arm) |
| How to find the moment of an item on an aircraft | multiply weight of item in pounds by distance from datum (arm) |
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