general aviation1
What instrument is used to measure the psecific gravity of the electrolyte ina lead-acid battery?
A hydrometer
What is used to neutralize spilled electrolyte from a lead-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 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 electrolyte in a lead acid battery that does not require that you apply a correction when measuring it"s specific gravity?
Between 70 degrees and 90 degrees Fahrenheit.
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.
How are the dimensions shown on an aircraft drawing?
By numbers shown in the break of a dimension line. ______________24"_______________
How can you know that the aircraft drawing you are using is the most current version of the drawing?
By the number in the revision block and by the log of the most recent drawinhgs.
How high should the electrolyte level be in a properly serviced lead-acid battery?
Only up the the level of the indicator in the cell.
How is a lead-acid battery compartment treated to protect it from corrosion?
Paint it with an asphaltic (tar base) paint of with polyurethane enamel.
What happens to the current in a DC circuit if the voltage is increased bgy the resistance remains the same?
The current increases.
What is the fuselage station number?
The distance in inches from the datum, measured along the longitudinal axis of the fuselage.
What are the 3 elements in the Ohm's law?
Voltage, current, and reesistance (volts, amps, and ohms).
What is meant by a kilowatt?
1,000 watts
How many cells are there in a 24-volt lead-acid battery?
12
How can you find the polarity of an electromagnet?
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 the impedance measured?
In ohms
Where is the title block normally located on an aircraft drawing?
In the lower right-hand corner of the drawing.
What is the purpose of a curring plane on an aircraft drawing?
It shows where an object has been cut to allow an auxiliary drawing to be made. The arrows on a cutting plane show the direction the auxiliary draawing is viewed.
What are the 5 sources of electrical energy?
Magnetism ,chemical energy, light, heat and pressure.
What information is given in the title block of an aircraft drawing?
N P S D Name & Address of the company who made the part. Part name. Scale of the drawing. Name of the draftsman. Name of the engineer approving the part and drawing number.
Which law of electricity is the mot important for an Which law of electricty is the most important for an aircraft mechanic to know?
Ohm's law.
What part of an amp is a milliamp?
On thousandth (0.001)
How many ohms are in a megohm?
One million (1,000,000)
What are the three types of DC circuits, 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
What is meant by inductance?
The ability to store electrical energy in electromagnetic fields.
What is meant by tolerance on an aircraft drawing?
The allowable plus or minus variation from the dimension given on the drawing.
What is meant by the clearance on an 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 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 ehemical changes that occur when the battery is charged or discharged. Its specific gravity does not change the appreciably.
What is the basic unit of capacitance?
The farad
What is the basic unit of inductance?
The henry
What four things affect hte resistance of an electrical conductor?
The material, the cross-sectional area, the length and the temperature.
The is the basic unit of resistance
The ohm
What is meant by impedance?
The total opposition to the flow of alternating current. It is the vector sum of resistance, capacitive reactance and inductive reactance.
What is meant by electromagnetic induction
The transfer of electrical energy from one conductor to another that is not electrically connected
What precautions should be taken in a maintance sho9p where both lead-acid and nickel-cadmium batteries are serviced?
The two types of batteries should be kept separte, 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 the basic unit of electrical power in a DC circuit?
The watt
Why should electrolytic capacitors not be used in an AC circuit?
They are polarized. An electrolytic capacitor will pass scurrent of one polarity, but will block current of the opposite polarity.
What is the purpose of the center line on an aircraft drawing?
This is the line that shows the center of the object in the drawing.
How many views are used to show the most objects in an aircraft drawing?
Three
What is the purpose of a capacitor?
To store electrical energy in electrostatic fields
