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Question 48-1 : Electric motors propulsion. the abbreviation corresponding to an engine that is not turning in a clockwise direction is ? [ Result takeoff ]
Ccw.
Ccw = counter clockwise.cw = clockwise
Question 48-2 : Electric motors propulsion. the abbreviation corresponding to an engine that is turning in a clockwise direction is ?
Cw.
Ccw = counter clockwise.cw = clockwise
Question 48-3 : Electric motors propulsion. the abbreviations cw and ccw for an electrical engine mean respectively ?
Clockwise and counter clockwise directions.
Ccw = counter clockwise.cw = clockwise
Question 48-4 : Considering a brushless electric motor of 440 kv, powered with a voltage of 24 volts. indicate the maximum speed of rotation of the motor. ?
10,560 rpm.
Kv x volts = speed of rotation per minute...note how the answers are about times ten from each other the calculation has virtually nothing to do with it...just to see if you understand the props are spinning really fast 10,000 vs 1,000 rpm and the props could hurt you or someone else...
Question 48-5 : Batteries. connecting two 6 v / 5 ah capacity batteries in series will result in a total voltage and capacity respectively of ?
12 v / 5 ah
Battery packs achieve the desired operating voltage by connecting several cells in series, with each cell adding to the total terminal voltage 12 volt / 5 amp hours...parallel connection attains higher capacity for increased current handling, as each cell adds to the total current handling 6 volt/ 10 amp hours...in parallel we increase the flow, in series we increase tension.
Question 48-6 : Batteries. the connection in parallel of two 6 volt / 5 amp.hours batteries, will create a unit with the following characteristics ?
6 v / 10 ah.
Battery packs achieve the desired operating voltage by connecting several cells in series, with each cell adding to the total terminal voltage 12 volt / 5 amp hours...parallel connection attains higher capacity for increased current handling, as each cell adds to the total current handling 6 volt/ 10 amp hours...in parallel we increase the flow, in series we increase tension.
Question 48-7 : Batteries. 4s is written of a lipo battery, it indicates ?
The number of cells in series.
A 4s battery pack means that there are 4 cells in series...1 cell = 3.7 v...4s = 4 cells in series 4 x 3.7 v = 14.8 volts.
Question 48-8 : Batteries. the capacity of a battery of ?
5 ah is 5 amp during 1 hour.
The capacity of a battery is the amount of ampere.hours the flow that a fully charged battery can supply...if a battery is rated at 5 ah, it can provide during 1 h 5 amp, or during 5 h 1 amp.
Question 48-9 : Batteries. the capacity of a battery is the ?
Amount of ampere hours that a fully charged battery can supply.
Question 48-10 : Batteries. the capacity of a battery is given in ?
Ampere hours.
Question 48-11 : Batteries. voltage of a battery is expressed in ?
Volt.
Voltage volt..power watt..capacity ampere..resistance ohm.
Question 48-12 : Batteries. associated value to the c letter of a lipo battery indicates ?
The maximum continuous discharge rate of the battery.
A lipo battery is a lithium polymer battery...keep in mind that. the voltage of a lipo battery is typically 3 to 4.2 v per cell use 3.7 v for the exam.. a lipo battery self discharges very slowly over time only 1% per month...the letter c stands for capacity the value listed indicates the maximum safe continuous discharge rate of your battery. if your battery is rated at 20c, this means you can continuously discharge the battery at a rate up to 20 times its capacity..capacity is usually measured in mah, and the most common batteries are 2200 mah =2.2a...example.2200mah 20c cell = 2.2a x 20 = 44a maximum continuous discharge.
Question 48-13 : Batteries. the term lipo means ?
Lithium polymer.
A lipo battery is a lithium polymer battery...keep in mind that. the voltage of a lipo battery is typically 3 to 4.2 v per cell use 3.7 v for the exam.. a lipo battery self discharges very slowly over time only 1% per month.
Question 48-14 : Batteries. when carrying out a battery condition check using the aircraft's voltmeter ?
A load should be applied to the battery in order to give a better indication of condition.
Question 48-15 : Batteries. when a battery is almost fully discharged there is a tendency for the ?
Voltage to decrease under load.
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