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Bakers School of Aeronautics Oral prep (1).
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Bakers School of Aeronautics Oral prepWhat is the most important law applicable to the study of electricity? - ANS-Ohms law
What are the elements of Ohm's Law? - ANS-Voltage, Current & Resistance
What are four sources of electrical power? - ANS-Thermal, light, pressure and chemical
What does an electrical circuit consist of? - ANS-source, Load/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 the unit of measure for capacitance? - ANS-Farad
What is the standard unit of measure for frequency? - ANS-Hertz
What is the basic component that allows current to flow in one direction? - ANS-A diode
What is inductance? - ANS-When voltage is induced by magnetic flux lines in an AC
circuit
What is an example of an inductor in a magneto? - ANS-the coil
What is impedance? - ANS-total opposition for AC to flow caused by effects of
resistance, inductive reactance and capacitance reactance.
What causes opposition to the flow of current in an AC circuit? - ANS-Inductive, and
capacitance reactance.
What is the unit of measurement for impedance? - ANS-Ohms
What is the purpose of a resistor? - ANS-To limit current.
How may the color bands of a fixed resistor be determined? - ANS-By the color bands
on the resistor.
,What are two things that happen when current flows through a conductor? - ANS-a
magnetic fields generated; the conductor heats up
What is the common name for lines of force that make up a field surrounding a magnet?
- ANS-Magnetic flux lines.
What is the concept that describes the relationship between electricity and magnetism?
- ANS-Electromagnetism.
What are the four factors that affect the resistance of an electrical conductor? -
ANS-Wire gauge, length, temperature and material
What is the unit of measurement of power in a DC circuit? - ANS-watt
746 Watts = 1hp
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 1.225 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 during charge or discharge
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°F or
below 70°F
,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 or above the baffle place in each cell
What are paralleling generators and how is the load distributed? - ANS-when two or
more generators are operated at the same time to supply power for a load that must be
shared equally.
Describe a no-trip circuit breaker (trip free). - ANS-makes it impossible to manually hold
the circuit closed when excessive current is flowing.
Can you store Ni-cad and Lead-acid batteries together? - ANS-No, fumes from lead
acid battery can contaminate the Nickel cadmium battery.
What is the result of an imbalanced cell in nickel cadmium battery? - ANS-Low internal
resistance cell, causes current to increase across the cell and heats up.
What happens to specific gravity of the electrolyte in lead acid battery when the
temperature changes? - ANS-Specific gravity will vary with temperature. If the
temperature of electrolyte increases, the specific gravity reading will be high.
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 a medium width line made up
of short dashes. Center lines are thin lines made up of alternating long and short
dashes. Alternate position lines are medium with line made up of one long and two short
evenly spaced dashes.
How are dimension lines shown on aircraft drawings? - ANS-Dimension lines are solid
and usually broken at the midpoint for the insertion of measurement.
What is a sketch for a repair? - ANS-It is a basic drawing that shows specific information
and minimum details needed to manufacture a part.
How may an aircraft drawing of a part be drawn to bring out pertinent details? - ANS-By
drawing a detailed view at a larger scale.
, 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
between parts
What is a fuselage station number? - ANS-distance from the datum in inches along
longitudinal axis.
What information is given in the title block of a blueprint? - ANS-Drawing number, name
of part, scale, date, firm, draftsman name, 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 for measurements. indicate the size.
How can a change to an aircraft drawing be identified? - ANS-revision letter (a, b, c, d,
etc)
What is the "bill of materials" associated with aircraft blueprint? - ANS-list of materials
and parts needed for fabrication or assembly of a component
Why are symbols used when drawing aircraft blueprints? - ANS-shorthand used in
drawings to keep writing and drawing to a minimum.
What is an orthographic projection? - ANS-A drawing which illustrates multiple views
and angles of an object.
How many views are required to determine the shape of an object? - ANS-3 views.
front, top and right side.
What is the purpose of one view drawings? - ANS-Used for objects of uniform
thickness, such as gaskets, shims and plates.
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