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Bakers School of Aeronautics Oral Prep.
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- A&P Oral Exam / AERO-TECH SCHOOL
Bakers School of Aeronautics Oral Prep.
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Bakers School of Aeronautics Oral PrepWhat 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 & Resistance
What are four sources of electrical power? - ANS-Mechanical, chemical, photoelectric
and thermal
What does an electrical circuit consist of? - ANS-1. a source of electrical pressure
2. resistance
3. conductors
What represents capacitance in an AC circuit? - ANS-a capacitor
What is the function of a capacitor? - ANS-to store electricity
What is the unit of measure for capacitance? - ANS-Farad
What is inductance? - ANS-When voltage is induced by magnetic flux
What is an example of an inductor in a magneto? - ANS-the coil
What is impedance? - ANS-total opposition for AC to flow
What is the unit of measurement for impedance? - ANS-Ohms
What are two things that happen when current flows through a conductor? - ANS-a
magnetic field; heats up
What are the four factors that affect the resistance of an electrical conductor? -
ANS-gauge, length, temperature and material
What is the unit of measurement of power in a DC circuit? - ANS-watt
What is a kilowatt? - ANS-1,000 watts
In a DC circuit, what occurs when voltage is increased while resistance remains
constant? - ANS-increase in current
,What are the three types of DC electrical circuits? - ANS-series, parallel, and complex
A 24 volt lead-acid battery has how many cells? - ANS-12 cells. Each rated at 2 volts.
What are the units that battery capacity are measured in? - ANS-Ampere-hours
What should be the specific gravity of the electrolyte in a fully charge 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-a hydrometer
Why can a hydrometer NOT be used to determine the charge of a nickel-cadmium
battery? - ANS-Specific gravity of the electrolyte in a nickel-cadmium battery does not
change appreciably
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 90F or
below 70F
What is the electromagnetic induction? - ANS-transfer of electrical energy by means of
a magnetic field
How are battery compartments protected against corrosion? - ANS-coated with special
corrosion resistant paint
What should be the correct electrolyte level in a properly serviced battery? - ANS-3/8
inches above the plates
What are paralleling generators and how is the load distributed? - ANS-when two or
more generators are operated at the same time; must be shared equality
Describe a no-trip circuit breaker (trip free). - ANS-makes it impossible to manually hold
the circuit closed
Can you store Ni-cad and Lead-acid batteries together? - ANS-has a low internal
resistance, the current will increase, causing it to heat up
,What type of lines are used on aircraft drawings to indicate hidden views, center lines,
and alternate position lines? - ANS-a hidden view line is medium width and made up of
short dashes. represents and edge that cannot be seen
center lines are thin and made up of alternating long and short dashes. used to indicate
the center.
alternate position lines are medium width and made up of one long and two short evenly
spaced dashes. used to show the alternate position of apart.
What is a sketch for a repair? - ANS-It is a basic drawing that shows specific information
and provides minimum detail needed to manufacture a part.
What type of drawing is most helpful in troubleshooting a system? - ANS-A schematic
Define "tolerance" as used in aircraft drawings. - ANS-the difference between the plus
and minus allowable dimension.
Define "clearance" as used in aircraft drawings. - ANS-dimension given for the space.
What is a fuselage station number? - ANS-distance from the datum.
What information is given in the title block of a blueprint? - ANS-number, name, scale,
date, firm, draftsman, checker and approving official.
Where is the title block usually found on an aircraft drawing? - ANS-lower right corner
Why are the dimensions used, and how are they shown on the aircraft drawings? -
ANS-solid narrow lines, broken at midpoint. indicate the size.
How can a change to an aircraft drawing be identified? - ANS-revision letter
What is the "bill of materials" associated with aircraft blueprint? - ANS-list of materials
and parts for fabrication or assembly.
Why are symbols used when drawing aircraft blueprints? - ANS-shorthand used in
drawings.
How many views are required to determine the shape of an object? - ANS-front, top and
right side.
, What is the datum and its purpose when making weight and balance computations? -
ANS-imaginary vertical lines from all measurements are taken and to determine the
relative location of items in the aircraft.
What is the purpose of weight and balance control? - ANS-for safety and efficiency in
flight.
When computing weight and balance, what is the 'movement' and how is it obtained? -
ANS-moment is a force which tends to rotate the aircraft. multiplying the weight by the
distance from the datum.
What is the 'arm' of an item and how is it obtained? - ANS-the distance is located either
from the datum.
What is 'tare weight' and how is it handled when making weight and balance
calculations? - ANS-weight of extra equipment
What is meant by 'minimum fuel' and how is it calculated for weight and balance? -
ANS-fuel that should be used in weight and balance. reciprocating engine airplane
certified under FAR Part 23. one half hour at maximum continuous power.
What is meant by 'residual' fuel? - ANS-the fuel remaining after fuel exhaustion.
What is meant by the center of gravity range? - ANS-distance from the most forward to
the most rearward.
How would you determine the empty weight and empty weight C.G. of an aircraft if all
weight and balance records are missing? - ANS-Re-weigh and calculate new weight
and balance records.
What is ballast? - ANS-weight which placed in the aircraft to attain a desired C.G.
What is the difference between fixing wing and rotor wing(helicopter) aircraft C.G.
ranges? - ANS-in a helicopter is much more critical than fixed-wing aircraft
When weighting an aircraft to determine the empty weight C.G., what must you do with
regard to the fixed equipment which is normally carried in the aircraft? - ANS-all
operations equipment.
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