FAA A&P Mechanics General Oral and Practical Questions and answers 2024 latest update already GRADED A+

What is the most important law applicable to the study of electricity? Ohm's Law (I = E ÷R) What are the elements of Ohm's Law? Voltage (E), current (I), and resistance (R) Things to Look Out for When Buying a Used Caravan Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:03 / 1:05 Full screen What are the sources of electrical power? Mechanical (generator), chemical (battery), photoelectric (light), and thermal (heat) What does an electrical circuit consist of? A source of electrical pressure or EMF, resistance in the form of an energy consuming electrical device or load, and conductors, usually in the form of copper or aluminum wires, to provide a path for electron flow. What represents capacitance in an AC circuit? A capacitor (condenser) What is the function of a capacitor? To store electricity What is inductance? A voltage that is induced in a coil in an AC circuit. This voltage is opposite in direction to the applied voltage, and opposes any change in the alternating current. What is impedance? It is the combined effect of resistance, inductive reactance, and capacitive reactance in an AC circuit What is the unit of measurement of power in a DC circuit? The watt. Amperes times volts equals watts (P = I × E). 746 watts equals 1 horsepower. What is a kilowatt? It is 1,000 watts In a DC circuit, what occurs when voltage is increased while resistance remains constant? There will be an increase in current. What are three types of DC electrical circuits? They are series circuits, parallel cicuits, and series-parallel circuits A 24 volt lead-acid battery has how many cells? It has 12 cells. Each cell is rated at 2 volts. What should be the specific gravity of the electrolyte in a fully charged lead-acid battery? It should be between 1.275 and 1.300 We have an expert-written solution to this problem! What instrument is used to determine the specific gravity of the electrolyte in a lead-acid battery? A hydrometer Why can't a hydrometer be used to determine the charge of a nickel-cadmium battery? The specific gravity of the electrolyte in a nickel-cadmium battery does not change appreciably during charge or discharge of the battery When using a hydrometer to check the charge of a lead-acid battery, at what temperatures must a correction factor be applied to the reading? Adjustments must be made if the temperature of the elextrolyte is above 90°F or below 70°F. What is electromagnetic induction? It is the transfer of electrical energy by means of a magnetic field. This is the principle of transformer operation. How are battery compartments protected against corrosion? They are coated with special corrosion resistant paints such as bituminous paint What should be the correct electrolyte level in a properly serviced battery? It should be approximately 3/8 inches above the plates. If the battery has baffle plates above the cell plates, the electrolyte level should be up to the holes in the baffle plate in each cell What type of lines are used on aircraft drawings to indicate hidden views? A hidden view line is a medium width line made up of short dashes. It represents an edge that cannot be seen when looking at the part from a specific postion What type of lines are used on aircraft drawings to indicate alternate positions? Alternate position lines are medium width lines composed of one long and two short evenly spaced dashes. They are used to show the alternate position of a part or the relative position of a missing part What type of lines are used on aircraft drawings to indicate center lines? Center lines are composed of alternate long and short dashes, and are used to indicate the center of an object or part of an object Define "tolerance" as used in aircraft drawings It is the sum of plus and minus allowence figures when a dimension shows an allowable variation Define "clearance" as used in aircraft drawings Clearance is the dimension given for fits between moving parts What information is given in the title block of a blueprint? The drawing number, the name of the part or assembly, the scale, the date, the name of the firm, the name of the draftsman, the checker, and the approving official Why are dimensions used, and how are they shown on an aircraft drawing? Dimensions are solid narrow lines, broken at midpoint for the insertion of measurements. They are used to indicate the size of an object. How can a change to an aircraft drawing be identified? They are usually listed in columns, either next to the title block or at one corner of the drawing What is a "bill of material" associated with aircraft blueprints? It is a list of materials and parts necessary for fabrication or assembly of a component or system Why are symbols used when drawing aircraft blueprints? Symbols are a type of shorthand used for drawing. They show the characteristics of a component with a minimum amount of drawing How many views are required to determine the shape of an object? Two views will not always determine the shape of an object. If three views are given, all three must be reviewed What is included in the "empty weight" of an aircraft? The empty weight consists of the airframe, the engine(s), and all items of operating equipment which have fixed locations and are permanently installed in the aircraft. This includes optional and special equipment, fixed ballast, unusable fuel, and full operating fluids (oil, hydraulic fluid, and other fluids that are required for normal operation of airplane systems, except potable water, lavatory precharge water, and water intended for injection in the engines) What is included in the "useful load" of an aircraft? The useful load is the weight of the pilot, copilot, passengers, baggage, and usable fuel. It is empty weight subtracted from the maximum allowable gross weight What is the "gross weight" of an aircraft? The gross weight is the empty weight plus the useful load. When an aircraft is carrying the maximum load for which it is certificated, takwoff weight is called the maximum allowable gross weight What is the "Center of Gravity" (CG) of an aircraft? The CG is the point about which an aircraft would balance if it where possible to suspend it at that point. It is the mass center of the aircraft, or the theoretical point at which the entire weight of the aircraft is assumed to be concentrated. The CG must be within specific limits for safe flight For the "Center of Gravity" (CG), what axis is of prime concern? The prime concern is the longitudinal balance, or the fore and aft location of the CG along the longitudinal axis. The CG location with reference to the lateral axis (wing tip to wing tip) is also important, however as far as weight is concerned, the design of the aircraft assumes lateral symmetry. What is the "datum" of an aircraft? The datum is an imaginary vertical plane or line from which all fore and aft measurements are taken. It is established by the manufacturer and can be at the nose, firewall, wing leading edge, a point in space in front of the nose, etc. What is the "arm" when considering weight and balance of an aircraft? The arm is the horizontal distance in inches from the datum to the center of gravity of an installed item. When an item is installed forward of the datum, the arm will be minus. An item installed aft of the datum will have a positive or plus value What is the "moment" when considering weight and balance of an aircraft? The moment is the product of the weight of an item multiplied by its arm. Moments arm expressed in pound-inches. How can the "total moment" of an aircraft be found when considering the weight and balance of the aircraft? The total moment is aircraft weight multiplied by the distance between the datum and aircraft CG. The CG of an aircraft can, therefore, always be found by dividing total moment by total weight What is meant by "minimum fuel" and how is it calculated for weight and balance purposes? Minimum fuel is the amount of fuel that should be used in weight and balance computations when the aircraft is loaded for an extreme condition check. For a reciprocating engin airplane certificated under FAR Part 23, this is the fuel necessary to operate the engine(s) for one-half hour at maximum continuous power What is "tare" weight, and how is it handled when making weight and balance calculations? Tare is the weight of the extra equipment used for weighing the aircraft, such as chocks, blocks, jacks, and chains. Tare weight must be subtracted from the scale readings in order t