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general
| Question | Answer |
|---|---|
| electrostatic fiels are also know as | dielelectric fields |
| what is the purpose of the ground symbol use in electrical circuit diagrams | to sho that thers is s return path for the current between the source of electrical energy and the load |
| when different rated capacitors are connected in parralled in a circuit the total capacitance is | equal to the sum of all the capacitances Ct=c1+c2+c3... |
| a 24 volt souce is required to furnish a 48 watts to a parrallel circuit consisting of four resistors of equal value, what is the voltage drop across each resistor | 24 volts |
| what will a voltmeter read if properly connected across a closed swithch in a circuit with electrical power on | zero votage |
| figure 16 with power to the bus and the fuel selector switched to the right-hand tank how many relays in the system are operating | 3 |
| which statment is correct when made in reference to a parrallel circuit | the total current is queal to the sume of the currents through the individual branches of the circuit |
| figure 19 when the trhrottles are retarded with only the right gear dokwn the warning horn will not sound if an open occurs in wire | No. 5 |
| when a charging current is applied to a nickel cadmiun battery the cells emit gas | toward the end of the charging cycle |
| in an AC circuit the effective voltage is | less then the maximun instantaneous voltage |
| figure 18 when the landing gears are up and the trrottle are retarded the horn will not sound if an open occurs in wire | No.4 |
| the purpose of providing a space underneath the plates in a lead acid batterrys cell container is to | prevent sediment boildup from contacting the plates and causing a short circuit |
| in a N-P-N transistor application the solid state device is turne on the when the | base is positive with repect to the emitter |
| nickel cadmium batteries wich are stored for a long period of time will show a low liquid level because | electrolyte becomes absobed into the plates |
| in P-N-- transistor appliction the solid state device is truned on when the | base is negative with repecte to the emitter |
| figure 19 under wich codition will a ground be provided for the waning horn trough both gear switches when the throttles are close | left gear up and right gear down |
| lead acid battery with 12 cells connected in series (no-load voltage+2.1 volts pre cell) furnishes 10 amperes to a load of 2-ohms resistance the internal resistance of the battery in this instance is | 0.52 ohms |
| unless otherwise specified any values given for current or voltage in a AC circuit are assumed to be | effective values |
| typical application for zener dieodes is a | voltage regulator |
| what is the Tc of a circuit containing three capacitors in parallel with capacitances of .02mf, .05mf and .10mf respctively | .170uf |
| which term meas .001 ampere | milliampere |
| a circuti has an applied voltage of 30 volts and a load consisting of a 10-*ohm resistor in series with a 20 ohm resistor what is the voltage drop across the 10-ohm resistor | 10 volts |
| figure 9 how many instruments (voltmeters and ammeters) are installed correctly | two |
| figure 17 the elctrical symbol represented electrical symbol represtned at number 5 is a variable | capasitor |
| what happens to the current in a voltage step-up transform with a ration of 1-4 | thw current is stepped down by a 1-4 ratio |
| figure 18 the contrl valbe swicht must be placed in the neutal position when the landing gears are down to | prevent the watning horm from sounding when the throttles are close |
| figure 15 withg the landing gear retracted the red indicator light will not come if an opne occures in wire | No.19 |
| T-F if one of three bulbs in parallel lighting circuit is removed the total resistance of the circuit will become grater | T |
| figure 15 when the landing gear is down the green light will not come on if an open occurs in wire | 6 |
| describe contibuting factors to the termal runaway in a nickel cadmiun battery intalled in an aircraft | low internal resistance intensified by high cell temperatures and a high current discharged/charge rate in constant potential (voltage) charging system |
| if three resistors of 3 ohm 5ohms 22 ohms are connected in series in a 28 volt circuit how much current will flow through the 3 ohm resistor | 0.93 ampere |
| capacitors are sometimes used in DC circuits to | smooth out slight pusations in current/voltage |
| the term that describes the cobined resistive forces in a AC circuit is | impedance |
| figure 16 enegize the circuit with the fuel tank selector swith selected to the left hand posistion using the schematic identify the witches that will change position | 5,6,11,12,13,15,16 |
| what may result if wate is added to a nickel cadium battery when it is not fully charge | excessive spewing is likely to occure during the charging cycle |
| figure 12 fin the Total resistance of that circuit | 21.2 ohms |
| the potential difference between two conductors which are inculated from each other is measure in | volts |
| through which material will magnetic lines of force pass the most readily | iron |
| which requires the mos electrical power during operation note 1Hp=746w a 12 v motor reqirirng 8 amperes, 4 30 w lamps in a 12 v paralle circuit or 2lights requiring 3amperes each in a 24v paralled system | twon lights requiring 3 amperes each in a 24v paralled system |
| a 24 v souce is required to furnish 48w to a parallel circuit consisting of 2 resistors of equal value what is the value of each resistor note Rt=E^2/p | 24 ohms |
| figure 14 the Tr of that circuit is | 17 ohms |
| if electrolyte from a leadacid battery is spilled in the battery compartment which procedure should be followed | apply sodium bicarbonate solution to the affected area followed by a water rinse |
| which condition is an indication of improperly torqued cell link connections of a nickel cadmium battery | heat or burn marks on the hardware |
| figure 2 what is the TC of a circuit contaning 3 capacitors with capacitance of .02mf .05mf and .10mf respectively | .012uF |
| an increses in wich of the following gactors will cause an increase in the inductive reactance of a circuit | inductance and frequency |
| which requires the most electrical power note 1hp=746w a1/5hp,24v motor which is 75% efficient, 4 30-w lamps arranged ina 12v paralled circuit | a 1/5Hp 24 volt morot which is 75% efficient |
| how much power must a 324v generator funish to a system 1 motor 755 efficient 1/5hp 3 position lights 20w each 1 eating element 5amp 1tnitcollisionlight 3 amps | 450 watts |
| convert Farads to microfarads by | mutiplying farads by 10 to the power of 6 |
| fig 8 with an ohmmeter connected in to the circuit as shown what will the ohmmeter read | 10 ohms |
| transfer of electic enegry from one circuit to another without the aid of electrical connections | is call induction |
| when referring to an electrical circuit diagram what point is considered to be at zero voltage | the ground reference |
| in nickel cadmium batteries a rise in cell temperature | causes a decreases in internal resistance |
| a 48v source is required to furnish 192 w to a parallel circuit consisting of 3 resistors of equal value what it the value of each resistor | 36 ohms |
| fig 17 which of the components is a pontetiometer | 3 |
| fig 6 if resistor R5 is disconnected at junction of R4 and R3 as shown what will the ohmmeter read | 3 ohms |
| what is the operating resistance of a 30w light bulb designed for a 28-volt system | 26 ohms |
| fig 26 which of the logic gate output conditions is correct with respect tot he given inputs | 2 |
| in a parallel circuit whit 4 6-ohms resistor across a 24-v battery what is the total voltage across resistor three VR3 in the circuit | 24v |
| the electrolyte of a nickel cadmium battery is the lowest when the battery is | in a discharged condition |
| the correct way to connect a test voltmeter in a circuit is | in parallel with a unit |
| how much power will a 1-hp 12v DC electric motor that is 75% efficient require | 994.6 w |
| fig 10 what is the measured voltage of the series-parallel circuit between terminal A&B | 3.0 v |
| fig 5 what is the impedance of an AC series circuit consisting of an inductor with a reactance of 10ohms a capacitor with a reactance of 4 ohms and a resistor with a resistance of 8 ohms | 10 ohms |
| T-F the hydrometer reading does no require a temperature correction if the electrolyte temperature is 80degree F | T |
| fig 16 what will be the effect if the PCO relay fails to operate when the left hand tank is selected | the fuel pressure crossfeed valve open light will not illuminate |
| what is the Tc of a certain circuit containing 3 capastitors with capacitance of .25mf .03 mf and .12 mf | Ct=c1+c2+c3 .4uf |
| describe the principal in a nickel cadium battery installed in an aircraft | to completely charge a nickel cadmium battery some gassing must take place thus some water will be used |
| diodes are used in electrical power supply circuits primarily as | rectifiers |
| convert farads to picofarads | multiplying farads by 10 to the power of 12 |
| fig 11 find the total current flowing in the wire between points C and D | 3.0 amperes |
| fig25 in a functional and operating circuit the depicted logic gate out put will be 0 | when one or more inputs are 0 |
| the method uses to rapidly charge a nickel cadmium battery utilizes | constant voltage and varying current |
| the presence of any small amount of potassium carbonate deposits on the tops of nickel cadmium battery cells in service is an indication of | normal operation |
| the basis for transformer operation in the use of alternating current is mutual | inductance |
| how many amperes will a 28v generator be required to supply to a circuit containing 5 lamps on parallel 3 of which have a resistance of 6 ohms each and 2 of which have a resistance of 5 ohms each | 25.23 amperes |
| the voltage drop in a circuit of known resistance is dependent on | the amperage of the circuit |
| which symbol represents a variable resistor | 2 |
| the working voltage of a capacitor in a AC circuit should be | at least 50% greater than the highest applied voltage |
| fig 11 the voltage across the 8-ohm resistor | 24v |
| fig 15 the No 7 wire is used to | close the push to test circuit |
| the opposition offered by a coil to the flow of alternating current is call | inductive reactance |
| which of the following are commonly used as a rectifiers in electrical circuits 1 anodes 2 cathodes 3 diodes | 3 |
| what unit is used to express electrical power | watt |
| what determines the amount of current which will flow through a battery while it is being charged by a constant voltage source | the state of charge of the battery |
| which of the following logic gates will provide an active high out only when all inputs are different | XOR |
| fig 23 if R2 sticks in the up position the light will | be on full bright |
| which is correct concerning a parallel circuit | total resistance will be smaller than the smallest resistor |
| what is the basic unit of electrical quantity | coulmb |
| how can the state of charge of a nickel cadmium battery be determined | by a measured discharge |
| fig 24 which statement concerning the depicted logic gate is true | any input being 1 will produce a 1 output |
| fig 3 when more than two inductors of different inductances are connected in parallel in a circuit the total inductance is | less than the inductance of the lowest rated inductor |
| a thermal switch or thermal protector as use in an electric motor is designed to | open the circuit in order to allow cooling of the motor |
| forward biasing of a solid state device will cause the device to | conduct |
| fig 13 determine the total current flow in the circuit | 1.4 amperes |
| when inductores are connected in series in a circuit the Total inductance is | Lt=l1+l2+l3 the sum of the individual inductances |
| what is the opposition to the flow of AC produced by a magnetic field with generated back voltage (EMF) called | inductive reactance |
| which illustration is correct concerning bias application and current flow | 1 |
| fig 7 if resistor R# is disconnected at terminal D what will the ohmmeter read | infinite resistance |
| when calculating power in a reactive or inductive AC circuit the true power is | less than the apparent power |
| a 14-ohm resistor is to be installed in a series circuit carrying .05 ampere how much power will the resistor be required to dissipate | at least 35 milliwatts |
| a 12v electric motor has 1,000 watts input and 1 hp output maintaining the same efficiency how much input power will a 24v 1hp electric motor require | 1000 watts |
| troubleshooting an open circuit with a voltmeter as shown in this circuit will | permit the battery voltage to appear on the volmeter |
| the end of charge voltage of a 19 cell nickel cadmium battery measured while still on charge | depends upon its temperature and the method used for charging |
| the electrolyte of a nickel cadmium battery is highest when the battery is | in a fully charged condition |
| which of these will cause the resistance of a conductor to decrases | decreases the length or increase the cross sectional area |
| what is the likely result of servicing and charging nickel cadmium and lead acid batteries together in the same service area | contamination of both types of batteries |
| fig 16 the TCO relay will operate if 24v DC is applied to the buts and the fuel tank selector is in the | crossfeed position |
| fig 23 if an open occurs at R1 the light | cannot be turned off |
| .002KV equals | 2.0 v |
| the amount of electricity a capacitor can store is directly proportional to the | plate area and inversely proportional to the distance between the plates |
| fig 19 when the landing gears are up and the throttles are retarded the warning horn will not should if an open occurs in wire | 6 |
| a cabin entry light of 10w and dome light of 20w are connected in parrallel to a 30v source if the voltage across the 10w light is measured it will be | equal to the voltage across the 20w light |
| which effect does not apply to the movement of electrons flowing in a conductor | static energy |
| fig4 how much power is being furnished to the circuit | 2645watts |
| in a parallel circuit whit 3 6-ohms resistors across a 12v battery what is the It value in the circuit | 6amps |
| fig 16 when electrical power is applied to the bus which relays are energized | PCC and TCO |
| batteries of different voltage (but similar capacities ) can be connected in series with each other across the charger and charged using the constant current method | true |
| batteries of different ampere hour capacity and same voltage can be connected in parallel with each other across the charger and charged using the constant voltage method | true |
| batteries of the same voltage and same ampere hour capacity must be connected in series with each other across the charger and charged using the constant current method | false |
| a fully charged lead acid battery will not freeze until extremely low temperatures are reached because | most acid is in the solution |
| fig 1 when different rated capacitors are connected in series in a circuit the CT is | less than the capacitance of the lowest rated capacitor |
| fig 41 determine how much fuel will be required for a 30 mn reserve operation at 2300 RPM | 25.3 |
| fig32 what is the next step required for a working sketch of the illustrations | sketch extension and dimesion lines |
| fig 41 determine the fuel consumption with the engine operating at cruise 2350 RPM | 55.3 punds per hour |
| a drawing in which the subassemblies or parts are shown as brought together on the aircraft is call | an installation drawing |
| for sketching perposes almost all abjects are composes of one or some cobination of six basic shapes these include the | triangle, sircle, cube, cylinder, cone, and sphere |
| fig 39 determine the maximun length of a no 16 caqble to be installed from a bus to the equipment in a 28v system with a 25ampere intermittent load and a 1v drop | 8feet |
| 1 scketches are usually made with the aid of drafting instruments 2 scketches are usually more complicated to make when using graph paper. regarding the above statemets wich one is true | neither 1 or 2 is true |
| a line used to show an edge which is not visible is a | hidden line |
| which stament is true regarding an orthographic projection | one view, two view, and three view drawings are the most common |
| fig 34 what is the dimension of the chamfer | 0.0625*45degrees |
| sketches are usually made easier by the use of | graph paper |
| fig 35 identiry the extension line | 3 |
| the measurements showing the ideal or 'perfect' sizes of parts on a drawings are call | dimensions |
| what meterial symbol is frequently used in a drawings to represent all metals | cast iron |
| when reading a blue print a dimensionis given as 4.387 inches +.005 -.002. which statime is true | the minimum acceptable size is 4.385 inches |
| fig 30 identify the bottom view of the object | 1 |
| zone numbers on aircraft blue prints are use to | locate parts sections and views on large drawings |
| fig 39 detemine the cable size of a 40ft length of single cable in free air with a continuous rating running from a bus to the equipment in a 2v systime with15ampere load and 1vdrop | No 10 |
| in a sectional view drawing what sections illustrate particular parts of an object | remove |
| what type line consist of alternating long and short lines | center |
| fig 38 an aircraft reciprocating engine has a 2800cubic inch displacement and develops 2000 brakeHp at 2200 RPM what is the brake mean effective pressure | 257.5 |
| fig 28 identify the bottom view of the object shown | 2 |
| the drawings often used in illustrated parts manuals are | exploded view drawings |
| fig 29 identify the left side view of the object shown | 3 |
| fig 39 determine the minimum wire size of a single cable in a bundle carrying a contiuous current of 20 amperes 10ft fromt he but to the equipment in a 28v system with an allowable 1vdrop | No 12 |
| fig 39 determine the maximum length of a No12 single cable that can be use between a 28v bus and component utilizing 20amperes cotinuos load in free air with a maximum acceptable 1v drop | 26.5 feet |
| fig 36 the diameter of the holes in the finished object is | 1/2 inch |
| fig 34 using the information what size drill would be required to drill the clevis bolthole | 5/16 inch |
| fig33 which symbol materialsection line symbol indicates cast iron | 3 |
| 1)a detail drawing is a description of a single part 2)an assembly drating is a dexcription of an object made up of two or more parts regading the above staments | both No 1 and 2 are true |
| what type of diagram shows the wire size required for a particular installation | a wire diagram |
| whatr numbering system is used to locate fuselage frames | stations numbers |
| what is the class of working drawing that is the description/depiction of a single part | detail drawing |
| what should be the first step of the procedure in sketching an aircraft wing skin repair | block in the views |
| 1)a measurement should not be scaled from an aircraft print beacuse the paper shrinks or stretches when the print is made 2)when a detail drawing is made it is crafully and accurately dran to scale and is dimensioned regarding the avobe statements | both No1 and No 2 are true |
| in the reading of aircraft blue prints the term 'tolrance' used in association with aircraft parts or components | is the difference between extreme permissible dimesions that a part may have and still be acceptable |
| fig 27 in that isometric view of a typical aileron balance weight identify the view indicated by the arrow | 3 |
| fig 34 what is the maximum diameter of the hole for the clevis pin | 0.3175 |
| what trype of line is normally used in a mechanical drawing or blue print to represent an edge or object not visible to the viewer | medium wight dashed line |
| fig 38 an aircraft reciprocating engine has a 1830 cubich inch displacement and develops 1250 brake Hp at 2500 RPM what is the brake mean effective pressure | 217 |
| 1)cording to 14 CFR par 91 repairs to an aircraft skin should ve a detailed dimesional skecth included in the permanent records2) on occasion a mechanic may need to make a simple sketch of a proposed repair to an aircraft a new desing or a modificationT-F | only No 2 is true |
| what is the allowable manufacturing tolarance for a bushing where the outside dimesions shown on the blueprint are 1.0625+.0025-.0003 | .0028 |
| schematic diagrams are best suited for which of the following | troubleshooting system malfunctions |
| a specific measured distance from the datum or some other point idetified by the manufcture to a pint in or on the aircraft is called a | station number |
| which stament is applicable when using a skect for making a part | the sketch must show all information to manufacture the part |
| fig 34 what would be the minimum diameter of 4130 round stock required for the contruction of the clevis that would produce a machined surface | 1 inch |
| fig 37 the vertical distace between the top of the plate and the bottom of the lowest 15/64 inch hole is | 2.367 |
| fig 40 determine the proper tension for a 1/8 inch cable (7 x 19) if the temperature is 80 degrees F | 70 punds |
| what is use to indicate that a surface must be machine finished | finished marks |
| fig38 an aircraft reciprocating engine has a 2800 cubic |
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