ASA AMT general oral questions

how many ohms are in a megohm

1 million

what is meant by a kilowatt

1,000 watts.

of what material are most low-pressure rigid fuel lines made

1100 - 1/2 hard or 3003 - 1/2 hard aluminum alloy tubing

how many cells are there in a 24 volt lead-acid battery

12

what kind of rigid tubing can be flared with a double flare

5052 - 0 and 6061 - t aluminum alloy tubing in sizes from 1/8 inch to 3/8 inch OD

how are dimensions shown on aircraft drawing

Buy number shown in the break of a dimension line

how can you tell the resistance of a composition resistor

By a series of colored bands around one end of the resistor.

how is the alternate position of a part shown on an aircraft drawing

By a thin line made up of a series of long dashes separated by two short dashes.

in what units is impedance measured

In ohms

what must be done to the tare weight when an aircraft is weighed

It must be subtracted from the scale reading to find the weight of the aircraft.

which law of electricity is the most important for an aircraft mechanic to know

Ohm's law

what part of an amp is a milliamp

One thousandth (0.001).

what is the principal advantage of Teflon hose for use in an aircraft hydraulic system

Teflon hose retains its high strength under conditions of high temperature

what is the basic unit of inductance

The Henry

what is meant by inductance

The ability to store electrical energy in electromagnetic fields.

what is a fuselage station number

The distance in inches from the datum, measured along the longitudinal axis of the fuselage.

what is the basic unit of capacitance

The farad.

what is the basic unit of resistance

The ohm.

what is meant by impedance

The total opposition to the flow of alternating current.

what is meant by electromagnetic induction

The transfer of electrical energy from one conductor to another that is not electrically connected

what is the basic unit of electrical power in a DC circuit

The watt.

what is the purpose of a capacitor

To store electrical energy in electrostatic fields.

what is the proper type of non-destructive inspection to use for locating surface cracks in an aluminum alloy casting or forging

Zyglo or Dye penetrant

what is meant by moment in the computation of weight and balance

a force that tends to cause rotation it is the price of weight of the object in pounds in the distance of the object from the datum in inches

which has the more critical center of gravity range an airplane or a helicopter

a helicopter

what instrument is used to measure the specific gravity of the electrolyte in a lead acid battery

a hydrometer

what is meant by the datum that is used for Weight and Balance computations

a readily identified reference chosen by the aircraft manufacturer from which all longitude locations on the aircraft are referenced

what is meant by an icebox rivet

a rivet made of 2017 or 2024 aluminum alloy these rivets are heat treated and quenched then stored and a sub-freezing icebox until they are ready to be used the cold storage delays the hardening of the rivet

what type of loading should be avoided when a self-locking nut on an aircraft Bolt

a self-locking nut should not be used for any application where there are any rotational forces applied to the nut or to the bolt

what is used to neutralize spilled electrolyte from a led acid battery

a solution of bicarbonate of soda and water

what is used to neutralize spilled electrolyte from A nickel cadmium battery

a solution of boric acid and water

what three things must all electrical circuits contain

a source of electrical energy a load to use the energy and conductors to join the source and the load

what equipment must be installed in aircraft when it is weight to find its empty weight center of gravity

all of the equipment that is listed on the aircraft equipment list as required equipment or as equipment that is permanently installed

what must be done to a weld joint if it must be rewelded

all traces of old weld must be removed so the new weld will penetrate the base metal

why is it important that a piece of aluminum alloy be quenched immediately after it is removed from the Heat Treating oven

any delay in Quinching aluminum alloy after it is removed from the oven will allow the grain structure to grow enough that intergranular corrosion is likely to form in the metal

why is it important that all parts be thoroughly clean before they are inspected by the dye penetrant method

any grease or dirt in a fault will keep the penetrant from seeping into the fault

what is the specific gravity of the electrolyte in a fully charged lead acid battery

between 1.275 and 1.3

what is the range of temperatures of an electrolyte in a lead acid battery that does not require that you apply a correction when measuring its specific gravity

between 70 degrees and 90 degrees Fahrenheit

is the size of a rigid fuel line determined by its inside or outside diameter

by it's outside diameter

is the size of a flexible hose determined by its inside or outside diameter

by its inside diameter

how can you know that the aircraft drawing you are using is most current version of the drawing

by the number in the revision block and by the log of his most recent drawings

explain the procedure to use when making a Dye penetrant inspection of a part

clean the park thoroughly and apply penetrant allow it to soak into the recommended time remove all penetrant from the surface and apply developer

what inspection method would be most appropriate for checking a non-ferrous metal part for intergranular corrosion

eddy current inspection

what are the two reasons Weight and Balance control are important to an aircraft

for safety of flight and for most efficient performance of the aircraft

explain the way a steel structure is normalized after it has been welded

heat the steel structure to a temperature above its critical temperature and allow it to cool in still air

how can you find the polarity of electromagnet

hold the electromatic in your left hand with your fingers and circling the coil and the direction the electrons flow your thumb will point to the North End of the electromagnet

what is the significance of the empty weight center of gravity range of an aircraft

if the empty weight center of gravity falls within the ewcg range, the aircraft cannot be legally loaded in such a way that it is loaded center of gravity will fall outside of the allowable loaded CG range. Not all aircraft have new ewcg range

why is it important that all engine parts which have been inspected by the magnetic particle method be completely demagnetized

if the parts are not completely demagnetize they will attract steel particles that are produced by engine wear and will cause damage to bearing surfaces

where can you find the leveling means that are specified for a particular aircraft

in a type certificate data sheets for the aircraft

where must a record be kept of the current empty way and the current center of gravity of an aircraft

in the aircraft flight manual or Weight and Balance records required by 14 CFR 23.1 583

where is the title block normally located on aircraft drawing

in the lower right-hand corner of the drawing

where's the arm of an item installed an aircraft recorded

in the type certificate data sheets for the aircraft

how is the welding flux removed from a piece of aluminum that has been gas welded

it should be removed by scrubbing it with hot water and a bristle brush

what is the purpose of a cutting plane on the aircraft drawing

it shows you where an object has been cut to allow an axillary drawing to be made the arrows on a cutting plane show the direction the axillary drawing is viewed

what are the five sources of electrical energy

magnetism chemical energy light heat and pressure

how do you find the moment of an item that is installed in aircraft

multiply the weight of the item and pounds by its distance from the datum in inches

what is meant by the minimum fuel as is used in the computation of aircraft weight and balance

no more fuel than the quantity necessary for 1/2 hour of operation at rated maximum continuous power it is maximum amount of fuel used in Weight and Balance computations when low fuel may adversely affect the most critical balance conditions

how high should the electrolyte level be in a properly serviced led acid battery

only up to the level of the indicator in the cell

what damage can be caused by over tightening an MS flare fitting

over tightening drives The Cutting Edge of the sleeve deeply into the tube and weakens it

how is a lead acid battery compartment treated to protect it from corrosion

paint it with a tar base paint or polyurethane enamel

where are quick disconnect fluid line couplings normally use in a aircraft hydraulic system

quick disconnect couplings are normally use where the engine driven pump connect to the hydraulic system

what are the three types of DC circuit's with regard to the placement of the various circuit components

series parallel and series parallel

how many views can there be in an orthographic projection

six

how can you distinguish an AN fluid line fitting from an AC fitting

the AN fitting has a shoulder between the end of the flare cone and the first thread. The threads of an AC fitting extend all the way to the flare cone.

describe the way you would find the empty weight and empty weight center of gravity of an airplane if there are no weight and balance records available

the aircraft is weighed and the empty weight center of gravity is computed. These values are recorded in New Weight and Balance records that are started for the aircraft

what is meant by the tolerance on an aircraft drawing

the allowable plus or minus variation from the dimension given on the drawing

what is meant by clearance on a aircraft drawing

the amount of space or separation that is allowed between two components or parts

what is the basic unit of current

the amp

what happens to the current in a DC circuit if the voltage is increased or the resistance Remains the Same

the current increases

why must we consider the category under which an aircraft is license when we compute it's weight and balance

the different categories under which an aircraft can be license have different maximum gross weight and different center of gravity ranges

what is meant by the arm of an item that is installed on aircraft

the distance in inches between the center of gravity of the item and the datum

when routing a fuel line in parallel to an electrical wire bundle, which should be on top?

the electrical wire bundle should be on top

why is a hydrometer not used to measure the state of charge of a nickel cadmium battery

the electrolyte of a nickel cadmium battery does not enter into the chemical changes that occur when the battery is charged or discharged its specific gravity does not change appreciably

why is empty weight center of gravity range not given in the type certificate data sheets for some aircraft

the empty weight center of gravity range is given only for aircraft that cannot be legally loaded in such a way that they're loaded center-of-gravity will fall outside of the limits

what precautions should be taken when flaring a piece of aluminum alloy tubing

the end of the tubing must be polished so it will not crack when it is stretched with the flaring tool

what is meant by undrainable fuel

the fuel that is left in the tank lines and components when the aircraft is placed and in level flight position in the fuel drain at the main fuel strainer. This is also called residual fuel

what determines the correct grip length of a bolt used in an aircraft structure

the grip length of the bolt should be the same as the combined thickness of the materials being held by the bolt

what is the minimum amount of slack that must be left when a flexible hose is installed in an aircraft hydraulic system

the hose should be at least 5% longer than the distance between the fittings this actually provide needed Slack

what four things affect resistance of an electrical conductor

the material the cross-sectional area the length and the temperature

what is meant by the maximum zero fuel weight of an aircraft

the maximum permissible weight of a loaded aircraft (passengers, crew, cargo, ect.)less it's fuel

what information is given in the title block of an aircraft drawing

the name and address of the company who made the part the name of the part the scale of the drawing the name of the draftsman the name of the engineer approving the part and the number of the part

how tight should the nut be installed on a clevis bolt that is used to attach a cable fitting to a control surface horn

the nut on a clevis bolt should not be tight enough to prevent the clevis bolt turning in the cable fitting and the horn

why is it very important that the structure of a piece of clad aluminum alloy not be scratched

the pure aluminum used for the cladding is non corrosive but the aluminum a alloy below the cladding is susceptible to corrosion if the cladding is scratch through corrosion could form

what determines the size of Chip that is to be used when gas welding steel

the thickness of the material being welded the size of the tip orifice determines the amount of flame produced and thus the amount of heat that is put into the metal

what precaution should be taken in maintenance shop for both let acid and nickel cadmium batteries are serviced

the two types of battery should be kept separate and the tools used on one type should not be used on the other

what is the basic unit of voltage

the volt

what is meant by the tare weight that is used in a weight and balance computation

the weight of the chocks and other items that are used to hold the aircraft on the scales

what must be done to find the empty weight of an aircraft if it has been weighed with fuel in it's tanks

the weight of the fuel and its moment must be subtracted from the weight and the moment of the aircraft as it was weighed

why should electrolytic capacitors not be use an AC circuit

they are polarized. an electrolytic capacitor will pass current of one polarity but will block the current of the opposite polarity

what is the purpose of a center line on an aircraft drawing

this is the one that shows the center of an object and the drawing

what is the function of the lay-line that runs the length of a flexible hose

this line shows the mechanic whether or not the line has been Twisted when it was installed the line should be straight, not spiraled

what are the distances of all items installed in the aircraft measured from the datum when Computing weight and balance

this makes it possible to find the point about which the aircraft would balance (center of gravity)

how much pressure is used to proof test a flexible hose assembly

this varies with the hose, but it is generally about 2 times the recommended operating pressure for the hose

explain the procedure to use when making a magnetic particle inspection of a part

thoroughly clean the part magnetized it as directed by the appropriate service manual for the indicating medium over the surface and inspect it under a blacklight when the inspection is complete thoroughly demagnetize the part

how many views are used to show the most objects in an aircraft drawing

three

how tight should an MS flareless fitting be tightened

tighten the fitting by hand until it is snug, and then turn it with a wrench for 1/6 turn to 1/3 turn. Never turn it more than one-third turn with a wrench

what are the three elements of Ohm's law

voltage current and resistance

what is meant by permanent ballast for an aircraft

weight that is currently installed an aircraft to bring the empty weight center of gravity into allowable limits

why is a piece of Steel tempered after as been hardened

when steals hardened it becomes brittle and temperature removes some of this brittleness

what inspection method would be most appropriate for checking the internal structure of an airplane wing for corrosion

x-ray inspection