ASA GENERAL & AIRFRAME ORAL
QUESTIONS & ANSWERS
What is the basic unit of voltage? - Correct Answers -The volt
What is the basic unit of current? - Correct Answers -The amp
What is the basic unit of resistance? - Correct Answers -The ohm
Which law of electricity is the most important for an aircraft mechanic to know? - Correct
Answers -Ohm's law
What are the three elements in Ohm's law? - Correct Answers -Voltage, current, and
resistance (volts, amps, and ohms)
What are five sources of electrical energy? - Correct Answers -Magnetism, chemical
energy, light, heat and pressure
What four things affect the resistance of an electrical conductor? - Correct Answers -
The material, the cross-sectional area, the length and the temperature
How can you tell the resistance of a composition resistor? - Correct Answers -By a
series of colored bands around one end of the resistor
What three things must all electrical circuits contain? - Correct Answers -A source of
electrical energy, a load to use the energy, and conductors to join the source and the
load
What is the purpose of a capacitor? - Correct Answers -To store electrical energy in
electrostatic fields
What is the basic unit of capacitance? - Correct Answers -The farad
Why should electrolytic capacitors not be used in an AC circuit? - Correct Answers -
They are polarized. An electrolytic capacitor will pass current of one polarity, but will
block current of the opposite polarity
What is meant by inductance? - Correct Answers -The ability to store electrical energy
in electromagnetic fields
What is the basic unit of inductance? - Correct Answers -The henry
,What is meant by impedance? - Correct Answers -The total opposition to the flow of
alternating current. It is the vector sum of resistance, capacitive reactance and inductive
reactance.
How can you find the polarity of an electromagnet? - Correct Answers -Hold the
electromagnet in your left hand with your fingers encircling the coil in the direction the
electrons flow. Your thumb will point to the north end of the electromagnet.
In what units is impedance measured? - Correct Answers -In ohms
What is the basic unit of electrical power in a DC circuit? - Correct Answers -The watt
What is meant by a kilowatt? - Correct Answers -1,000 watts
What happens to the current in a DC circuit if the voltage is increased but the resistance
remains the same? - Correct Answers -The current increases
What are three types of DC circuits, with regard to the placement of the various circuit
components? - Correct Answers -Series, parallel and series-parallel
How many cells are there in a 24-volt lead-acid battery? - Correct Answers -12
What is the specific gravity of the electrolyte in a fully charged lead-acid battery? -
Correct Answers -Between 1.275 and 1.300
What is the range of temperatures of the electrolyte in a lead-acid battery that does not
require that you apply a correction when measuring its specific gravity? - Correct
Answers -Between 70 degrees and 90 degrees Fahrenheit
What instrument is used to measure the specific gravity of the electrolyte in a lead-acid
battery? - Correct Answers -A hydrometer
How is a lead-acid battery compartment treated to protect it from corrosion? - Correct
Answers -Paint it with an asphaltic (tar base) paint or with polyurethane enamel
What is used to neutralize spilled electrolyte from a lead-acid battery? - Correct
Answers -A solution of bicarbonate of soda and water
How high should the electrolyte level be in a properly serviced lead-acid battery? -
Correct Answers -Only up to the level of the indicator in the cell
What precautions should be taken in a maintenance shop where both lead-acid and
nickel-cadmium batteries are serviced? - Correct Answers -The two types of batteries
should be kept separate, and the tools used on one type should not be used on the
other
, Why is a hydrometer not used to measure the state of charge of a nickel-cadmium
battery? - Correct Answers -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.
What is used to neutralize spilled electrolyte from a nickel-cadmium battery? - Correct
Answers -A solution of boric acid and water
What is meant by electromagnetic induction? - Correct Answers -The transfer of
electrical energy from one conductor to another that is not electrically connected
How many ohms are in a megohm? - Correct Answers -One million (1,000,000)
What part of an amp is a milliamp? - Correct Answers -One thousandth (0.001)
What is meant by tolerance on an aircraft drawing? - Correct Answers -The allowable
plus or minus variation from the dimension given on the drawing
What is meant by clearance on an aircraft drawing? - Correct Answers -The amount of
space, or separation, that is allowed between two components or parts
What information is given in the title block of an aircraft drawing? - Correct Answers -
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 (the drawing number).
How are dimensions shown on an aircraft drawing? - Correct Answers -By numbers
shown in the break of a dimension line
How can you know that the aircraft drawing you are using is the most current version of
the drawing? - Correct Answers -By the number in the revision block and by the log of
the most recent drawings
How many views can there be in an orthographic projection? - Correct Answers -Six
How many views are used to show most objects in an aircraft drawing? - Correct
Answers -Three
What is the purpose of a center line on an aircraft drawing? - Correct Answers -This is
the line that shows the center of the object in the drawing
What is a fuselage station number? - Correct Answers -The distance in inches from the
datum, measured along the longitudinal axis of the fuselage
QUESTIONS & ANSWERS
What is the basic unit of voltage? - Correct Answers -The volt
What is the basic unit of current? - Correct Answers -The amp
What is the basic unit of resistance? - Correct Answers -The ohm
Which law of electricity is the most important for an aircraft mechanic to know? - Correct
Answers -Ohm's law
What are the three elements in Ohm's law? - Correct Answers -Voltage, current, and
resistance (volts, amps, and ohms)
What are five sources of electrical energy? - Correct Answers -Magnetism, chemical
energy, light, heat and pressure
What four things affect the resistance of an electrical conductor? - Correct Answers -
The material, the cross-sectional area, the length and the temperature
How can you tell the resistance of a composition resistor? - Correct Answers -By a
series of colored bands around one end of the resistor
What three things must all electrical circuits contain? - Correct Answers -A source of
electrical energy, a load to use the energy, and conductors to join the source and the
load
What is the purpose of a capacitor? - Correct Answers -To store electrical energy in
electrostatic fields
What is the basic unit of capacitance? - Correct Answers -The farad
Why should electrolytic capacitors not be used in an AC circuit? - Correct Answers -
They are polarized. An electrolytic capacitor will pass current of one polarity, but will
block current of the opposite polarity
What is meant by inductance? - Correct Answers -The ability to store electrical energy
in electromagnetic fields
What is the basic unit of inductance? - Correct Answers -The henry
,What is meant by impedance? - Correct Answers -The total opposition to the flow of
alternating current. It is the vector sum of resistance, capacitive reactance and inductive
reactance.
How can you find the polarity of an electromagnet? - Correct Answers -Hold the
electromagnet in your left hand with your fingers encircling the coil in the direction the
electrons flow. Your thumb will point to the north end of the electromagnet.
In what units is impedance measured? - Correct Answers -In ohms
What is the basic unit of electrical power in a DC circuit? - Correct Answers -The watt
What is meant by a kilowatt? - Correct Answers -1,000 watts
What happens to the current in a DC circuit if the voltage is increased but the resistance
remains the same? - Correct Answers -The current increases
What are three types of DC circuits, with regard to the placement of the various circuit
components? - Correct Answers -Series, parallel and series-parallel
How many cells are there in a 24-volt lead-acid battery? - Correct Answers -12
What is the specific gravity of the electrolyte in a fully charged lead-acid battery? -
Correct Answers -Between 1.275 and 1.300
What is the range of temperatures of the electrolyte in a lead-acid battery that does not
require that you apply a correction when measuring its specific gravity? - Correct
Answers -Between 70 degrees and 90 degrees Fahrenheit
What instrument is used to measure the specific gravity of the electrolyte in a lead-acid
battery? - Correct Answers -A hydrometer
How is a lead-acid battery compartment treated to protect it from corrosion? - Correct
Answers -Paint it with an asphaltic (tar base) paint or with polyurethane enamel
What is used to neutralize spilled electrolyte from a lead-acid battery? - Correct
Answers -A solution of bicarbonate of soda and water
How high should the electrolyte level be in a properly serviced lead-acid battery? -
Correct Answers -Only up to the level of the indicator in the cell
What precautions should be taken in a maintenance shop where both lead-acid and
nickel-cadmium batteries are serviced? - Correct Answers -The two types of batteries
should be kept separate, and the tools used on one type should not be used on the
other
, Why is a hydrometer not used to measure the state of charge of a nickel-cadmium
battery? - Correct Answers -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.
What is used to neutralize spilled electrolyte from a nickel-cadmium battery? - Correct
Answers -A solution of boric acid and water
What is meant by electromagnetic induction? - Correct Answers -The transfer of
electrical energy from one conductor to another that is not electrically connected
How many ohms are in a megohm? - Correct Answers -One million (1,000,000)
What part of an amp is a milliamp? - Correct Answers -One thousandth (0.001)
What is meant by tolerance on an aircraft drawing? - Correct Answers -The allowable
plus or minus variation from the dimension given on the drawing
What is meant by clearance on an aircraft drawing? - Correct Answers -The amount of
space, or separation, that is allowed between two components or parts
What information is given in the title block of an aircraft drawing? - Correct Answers -
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 (the drawing number).
How are dimensions shown on an aircraft drawing? - Correct Answers -By numbers
shown in the break of a dimension line
How can you know that the aircraft drawing you are using is the most current version of
the drawing? - Correct Answers -By the number in the revision block and by the log of
the most recent drawings
How many views can there be in an orthographic projection? - Correct Answers -Six
How many views are used to show most objects in an aircraft drawing? - Correct
Answers -Three
What is the purpose of a center line on an aircraft drawing? - Correct Answers -This is
the line that shows the center of the object in the drawing
What is a fuselage station number? - Correct Answers -The distance in inches from the
datum, measured along the longitudinal axis of the fuselage
