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Question 49-1 : Batteries. calculate the capacity of a 15 volt battery with a power of 75 watt/hour ? [ Quiz specific ]
5 ah.
The capacity of a battery is given in ampere hours ah...amperes = watts / volts..amperes = 75 / 15 = 5 ah.
Question 49-2 : Batteries. how many volts is a lipp6s battery ?
22.2 v.
1 cell = 3.7 v. 6s = 6 cells in series 6 x 3.7 v = 22.2 volts...when you connect battery cells in series, you increase their voltage...when you connect battery cells in parallel, you increase their capacity.
Question 49-3 : Batteries. effect of negative or low temperatures on a lithium ion battery is ?
A reduced endurance.
Cold weather affects two key factors the electrochemical reactions that convert the chemical energy stored in the materials into electrical energy, and the battery's internal resistance. this results in reduced runtime..returning to a normal operating temperature should in principle restore the same runtime if the battery is well designed..if you plan to fly in cold conditions, keep your batteries in your pockets and install them only when performing your pre flight checks.
Question 49-4 : Batteries. the voltage of a lipo3s battery is ?
11.1 v.
1 cell = 3.7 v...3s = 3 cells in series 3 x 3.7 v = 11.1 volts...when you connect battery cells in series, you increase their voltage...when you connect battery cells in parallel, you increase their capacity.
Question 49-5 : Batteries. the nominal voltage of a lipo 4s3p battery is ?
14.8 v.
1 cell = 3.7 v...4s = 4 cells in series 4 x 3.7 v = 14.8 volts...3s = 3 lines of pack cells in parallel..when you connect battery cells in series, you increase their voltage..when you connect battery cells in parallel, you increase their capacity.
Question 49-6 : Batteries. lithium ion batteries should be handled with care because ?
Of their propensity to heat up or catch fire if damaged.
Question 49-7 : Batteries. a 4s lipo 2p battery rated at 8,000 mah has a power of ?
118.4 wh.
4s lipo 1p= 1 pack of 4 cells of 8,000 mah in series...4s lipo 2p= 2 packs of 4 cells of 4,000 mah in series, both pack are in parallel to reach 8,000 mah 2x4000...4s = 4 x 3.7 volt = 14.8 volts...power watts = volts x ampere = 14.8 x 8 ah = 118.4 wh...just for information power is the rate of delivery of energy energy is the work performed.
Question 49-8 : A battery presents the following characteristics 4s lipo of 5,000 mah 35 c. 35c means a discharge rates of ?
175a.
1 cell = 3.7 volts. 5,000 mah = 5 a...discharge rate c = 5a x 35 = 175 a
Question 49-9 : Your drone uses lipo 6s batteries. you may use.1 two 3s batteries in parallel.2 two 3s batteries in series.3 two 6s batteries in series.4 two 6s batteries in parallel..the combination regrouping all the correct statements is ?
2 4.
6s battery = 6 cells en series.6 x 3.7 v = 22.2 volts...when you connect battery cells in series, you increase their voltage..when you connect battery cells in parallel, you increase their capacity...two 3s in series. 3 x 3.7 volts + 3 x 3.7 volts = 22.2 volts = ok...two 6s in parallel capacity is increased but not voltage, it remains at 22.2 volts = ok.
Question 49-10 : You have a lipo 3s1p battery, rated at 5200 mah. the energy power of this battery is ?
57.7 wh.
1 cell = 3.7 v...3s = 3 cells in series 3 x 3.7 v = 11.1 volts...1p = only one line of a cells pack...power watts = volts x ampere = 11.1 x 5.2 ah = 57.7 wh...just for information power is the rate of delivery of energy energy is the work performed.
Question 49-11 : Identify the three possible modes of the return to home rth function. ?
Return to starting point, hover, immediate landing.
Agl above ground level.
Question 49-12 : The primary function of an autopilot is to..... ?
Control the rpa.
The autopilot will help you to fly in marginal weather conditions rain, wind , it will help stabilize the drone in particular, and also permits to save energy and time for the operator. but its primary function is to control the rpa.
Question 49-13 : From the choices below, indicate the redundancy that is not typically found in a remotely piloted aircraft system. ?
Two remote controls.
We will consider this answer as the most accurate, we can consider that in case of failure of a compass, inertial unit or gps, a drone that would be operated in advanced operation, in automatic or autonomous mode, must be able to continue its mission with a failed element. the redundancy of these elements would ensure flight continuity without pilot intervention.
Question 49-14 : From the choices below, indicate the item that is not needed for the proper operation of a ground control station. ?
A second remote control.
We do not need to have a second remote to fly our drone. it is certain that having one in spare is a bonus, but it is not legally necessary.
Question 49-15 : On a multi rotor rpa, the inertial measurement unit imu is particularly vulnerable to..... ?
Vibrations.
The key to answering this question is multirotor. a drone with several rotors will undergo many vibrations due to the differences in rotational speed between the different motors...the imu detects movements, it is an inertial control unit, it records accelerations in all 3 planes, it will easily record the movements of the drone in sharp turns or under load factor g , it is not affected by electromagnetic interference or heat that could be released by an electric or even thermal motor.
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