Electrical 01 Flashcards
The Capacity of a battery is measured in?
- Joules
- Volt Amps
- Amp Hours
- Farads
3.Amp Hours
What is the problem if you are just using the aircraft battery on its own because the generated power sources have failed?
1.The voltage may not be high enough for your requirements.
2.You cannot get any AC power from the battery as it’s DC
3.You can’t fly because it doesn’t have wings. DPTA
4.The remaining power is time limited
4.The remaining power is time limited
Select the four types of Battery used in aircraft:
1.Lithium Peroxide
2.Lead Acid
3.Nickel-Cadmium
4.Lithium-Ion
5.Lithium Polymer
6.Cadmium-Polymide
2.Lead Acid
3.Nickel-Cadmium
4.Lithium-Ion
5.Lithium Polymer
Why is it important to check the Static wicks (dischargers) before engine start?
1.To ensure they aren’t loose.
2.Because they will ensure the aircraft is at zero volts potential when flying.
3.There must be a minimum number serviceable or you might not be able to fly.
4.You won’t be able to light up the engines if they are missing.
3.There must be a minimum number serviceable or you might not be able to fly.
Which of the following circuit breakers would you put into a sensitive circuit?
1.Thermal
2.Magnetic
3.Capacitive
4.Inductive
2.Magnetic
A Simple DC system on a modern single engine aircraft consists of:
1.A DC Generator, alternator and BUS bars
2.An Alternator with Voltage Regulator, a battery, and one or more BUS bars.
3.An Alternator which does not require voltage regulation, an AC battery and 2 BUS bars.
4.A DC generator, battery, alternator switch and 2 or more BUS bars.
- An Alternator with Voltage Regulator, a battery, and one or more BUS bars.
The flight safety risk of a Lithium battery fire on the aircraft, is increased;
1.If the battery is pre-charged
2.If you are flying through a snow storm.
3.If the demand on the AC Generation system is increased.
4.If the aircraft is full of passengers
4.If the aircraft is full of passengers
Which of the following most directly relates to magnetic field strength:
1.Frequency
2.Voltage
3.Current
4.Resistance
3.Current
What is the problem with resetting a Circuit Breaker more than once?
1.There are a limited number of presses available in the CB.
2.The second time is pointless.
3.The button may stick in, rendering the CB unusable.
4.Each time you press it in, it will momentarily allow the fault to generate some heat, increasing the fire risk.
- Each time you press it in, it will momentarily allow the fault to generate some heat, increasing the fire risk.
With a short circuit;
1.Resistance drops and current increases while voltage is relatively constant.
2.Resistance and voltage drop while current remains constant.
3.Resistance is increased which raises the voltage and causes the current to become excessive.
4.Voltage rises causing current to increase with a subsequent drop in power.
- Resistance drops and current increases while voltage is relatively constant.
Flying through what conditions are you most likely to build up excessive static electricity?
1.Snow shower
2.Cold air
3.Humid air
4.Warm Humid Air
- Snow shower
An over-current situation on an aircraft may be:
1.Ambient
2.Transient
3.Impotent
4.Lenient
2.Transient
How is voltage controlled in an electrical generation device?
1.A voltage sensitive circuit will control the current through the field.
2.Resistance of the output windings will be increased
3.Capacitance is monitored as required.
4.The voltage is monitored and then the rotor speed is changed.
1.A voltage sensitive circuit will control the current through the field.
The essential difference between AC alternators and DC generators (dynamos) is that the;
a. induced windings of the alternators are rotating (rotor), and the dynamos have a rotary inductor coil
b. alternators supply all of the output current through the commutator and brush assemblies
c. induced (output) windings of the alternators are fixed (stator), and dynamos have a fixed exciter (field) coil
d. The alternators generate much less power than DC generators
c.induced (output) windings of the alternators are fixed (stator), and dynamos have a fixed exciter (field) coil
Why is Voltage control necessary?
a. Without it the voltage of the generator would vary with RPM only.
b. Voltage control is only necessary if a generator is fitted not an alternator.
c. Without it the voltage of the generator would vary with generator load only.
d. Without it the voltage of the generator would vary with RPM and generator load.
d.Without it the voltage of the generator would vary with RPM and generator load.
