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(SIMPLIFIED) A&P Oral Exam _ AERO-TECH SCHOOL
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(SIMPLIFIED) A&P Oral Exam _ AERO-TECH SCHOOL
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(SIMPLIFIED) A&P Oral Exam /AERO-TECH SCHOOL
"BASIC ELECTRICITY" - ANS-
What is the most important law applicable to the study of electricity? - ANS-Ohm's Law
What are the elements of Ohm's Law? - ANS-Voltage, Current and Resistance
What are the sources of electrical power? - ANS-Mechanical, Chemical, Photoelectric
and Thermal
What does an electrical circuit consist of? - ANS-A electrical source, resistance and
conductors
What represents capacitance in an AC circuit? - ANS-A capacitor
What is the function of a capacitor? - ANS-To store electricity.
What is inductance? - ANS-A voltage that is induced in a coil in an AC circuit
What is impedance? - ANS-It is combined effect of RESISTANCE, INDUCTIVE
REACTANCE and CAPACITIVE REACTANCE
What is the unit of measurement of power in a DC circuit? - ANS-Watt
What is a kilowatt? - ANS-1000 watts
In a DC circuit, what occurs when voltage is increased while resistance remains
constant? - ANS-The current increases
What are the three types of DC electrical circuits? - ANS-Series, Parallel and
Series-Parallel
A 24-volt lead-acid battery has how many cells? - ANS-12 cells
What should be the specific gravity of the electrolyte in a fully charged lead-acid
battery? - ANS-Between 1.275 and 1.300
,What instrument is used to determine the specific gravity of electrolyte in a lead-acid
battery? - ANS-Hydrometer
Why can't a hydrometer be used to determine the charge of a nickel-cadmium battery? -
ANS-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? - ANS-Above 90°
Fahrenheit or below 70° Fahrenheit
What is electromagnetic induction? - ANS-Transfer of Energy by magnetic field
How are battery compartments protected against corrosion? - ANS-By the use of
corrosion resistant paints.
What should be the correct electrolyte level in a properly serviced battery? - ANS-3/8
inches above the plates.
Why should nickel-cadmium batteries and lead-acid batteries not be stored or serviced
in the same area? - ANS-The electrolytes of both batteries are chemically opposite and
the fumes from lead-acid battery can contaminate the electrolyte in the nickel-cadmium
batteries.
"AIRCRAFT DRAWINGS" - ANS-
What type of lines are used on aircraft drawings to indicate hidden views, alternate
positions and center lines? - ANS-A hidden line is made up of short dashes (------).
Alternate position lines are composed of 1 long and 2 short dashes.(_______-- --).
Center lines are composed of alternate long and short dashes (__-__-__-).
Define "tolerance" as used in aircraft drawings. - ANS-It is the sum of plus and minus
allowance figures.
Define "clearance" as used in aircraft drawings. - ANS-Dimensions given for fits
between moving parts.
What information is given in the title block of a blueprint? - ANS-Drawing number, name
of part, scale, date, name of the firm, draftsman, checker and approving official.
,Why are dimensions used and how are they shown on an aircraft drawing? -
ANS-Dimensions are solid narrow lines and they are used to indicate the size of an
object.
How can a change to an aircraft drawing be identified? - ANS-They are usually listed in
columns or at one corner of the drawing.
What is a "bill of material" associated with aircraft blueprints? - ANS-List of materials
and parts necessary for fabrication component or system.
Why are symbols used when drawing aircraft blueprints? - ANS-To show the
characteristics of a component
How many views are required to determine the shape of an object? - ANS-Generally 3
views
"WEIGHT AND BALANCE" - ANS-
What is the datum and its purpose when making weight and balance computation? -
ANS-Imaginary vertical line used as reference in weight and balance calculations.
What is the purpose of weight and balance control? - ANS-Safety and efficiency in flight
When computing weight and balance, what is the "moment" and how is it obtained? -
ANS-It is a force, which tends rotate the aircraft about its center of gravity. It is obtained
by multiplying the weight of an item by the distance of the item from the datum.
What is the "arm" of an item and how is it obtained? - ANS-The arm of the item is the
distance of item from the datum. It is obtained by actual measurement or weight and
balance records.
What is "tare" weight and how is it handled when making weight and balance
calculations? - ANS-It is the weight of extra equipment. It must be subtracted from the
scale to obtain the actual weight of the aircraft.
What is meant by "minimum fuel" and how is it calculated for weight and balance
purposes? - ANS-Amount of fuel used in weight and balance computations. Fuel
necessary to operate the engines for one-half hour continuously.
, What is meant by "residual" fuel? - ANS-Unusable. It is part of the aircraft's empty
weight
How would you determine the empty weight and empty weight CG of an aircraft which
has tricycle landing gear if all weight and balance records are missing? - ANS-Use three
scales and record the weight under each wheel. Then, measure the distance in inches
from nosewheel to the main gear and multiply this figure by the combined weight of
each main wheel. Into this number divide the total weight of the aircraft.
What is "ballast"? - ANS-It is weight added to an aircraft to attain its CG location.
What is the difference between fixed-wing aircraft and helicopter CG range? - ANS-The
CG location in a helicopter is much more critical than in fixed-wing aircraft.
When weighting an aircraft to determine the empty weight CG, what must you do with
regard to the equipment which is normally carried in the aircraft? - ANS-It must be
included in the aircraft's empty weight.
Why do some manufacturers specify an empty weight CG even though the aircraft is not
operated at this empty weight? - ANS-Empty weight CG falls within the empty weight
CG range
Why must the aircraft category be considered when computing weight and balance? -
ANS-Due a difference maximum allowable gross weight depending on which category
the aircraft will be operated in.
What undesirable flight characteristic is most likely to result from exceeding the forward
CG limit of an aircraft? - ANS-Insufficient stability. Difficulty in controlling the aircraft
The forward CG limit of an aircraft is exceeded by installation of several items of
equipment in the engine compartment. How can this problem be corrected or
compensated for without removing or changing any of the newly installed equipment? -
ANS-Ballast is used
What is meant by positive and negative moment? - ANS-Multiplying a weight by an arm
will result in a plus moment if the signs are alike and minus moment if the signs are
unlike.
"FLUID LINES AND FITTINGS" - ANS-
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