Aircraft electrical system

Question 1

What is the purpose of a circuit breaker

Answer 1

Protect the circuit and wires from fire. The circuit breaker opens the circuit when an overload exists

Question 2

What are the two principles on which circuit breakers operate

Answer 2

Thermal a magnetic

Question 3

What tool is used to measure the size of unmarked electrical wires

Answer 3

A wire gauge

Question 4

What are the colors of an aircraft position lights and where are they mounted

Answer 4

Green light right wingtip red light left wingtip white light in a position where is visible from the rear of the aircraft

Question 5

What are the factors to be considered when selecting wire size for an electrical power

Answer 5

One factor is allowable power loss In the line. A second factor is the permissible voltage drop in the line and the third factor is the current caring ability of the conductor

Question 6

When is a circuit breaker a fuse design to open the circuit

Answer 6

Before the conductor in mid smoke. To accomplish this the current characteristics of the protected device Must fall below that of the associated conductor

Question 7

What type of breakers are not acceptable for use in aircraft

Answer 7

Auto reset breaker’s

Question 8

What is a slow blow a fuse

Answer 8

If use to compensates for surges in high in rush current by not blowing for several milliseconds

Question 9

What are the three most common fault that occur in an electrical circuit

Answer 9

Short circuit, open circuit, low power

Question 10

What size electrical conduit should be used for a specific cable bundle

Answer 10

Conduit should have an inside diameter that is 25% larger than the maximum diameter of the conductor bundle

Question 11

What color insulator on a solderless connector is proper for a 10 gauge wire

Answer 11

Yellow

Question 12

How should electrical switches typically be oriented in the on portion

Answer 12

Upper or forward

Question 13

When should electrical switches be derated from their normal current rating

Answer 13

Russian circuits such as circuits containing indicates lamps, and inductive circuits that have magnetic energy stored in the solenoid coil’s, or relays, and for DC motor circuits, which draws several times they’re rated current during starting

Question 14

When do DC electric motors drawl several times they’re rated current

Answer 14

During starting

Question 15

How should electrical switches typically be oriented in the On position

Answer 15

Upper Or Forward

Question 16

What would cause an AC electrical motor to run too fast

Answer 16

And excessive supply voltage, or the motor field windings shorted

Question 17

What would cause an AC electrical motor to run to slow

Answer 17

Low applied voltage, defective wiring, or no lubrication

Question 18

How is the output voltage of an alternator controlled

Answer 18

By using a voltage regulator to control the exciter field current and dust regulate the exciter output voltage applied to the alternator field

Question 19

What should be checked before any aircraft electrical load is increased

Answer 19

The associated wires, conductors, and circuit protection devices should be checked to determine that the new load will not exceed the rated limits of these units

Question 20

What is the main advantage of using a AC for Aircraft electrical power Systems

Answer 20

The principal advantage is that the voltage of AC power systems is easily changed by the use of a transformer. Therefore, you can transmit power at high-voltage and low current and thus reducing the size and weight of the wire in the circuit

Question 21

In AC power system how is DC obtained for battery charging

Answer 21

The alternating current is changed to direct current by the use of the rectifier

Question 22

What warns pilots Of overheating batteries

Answer 22

The thermal sensor in the battery and a light in the cockpit

Question 23

How long should bonding jumper wires be made

Answer 23

Large enough to handle all the return current flow in a short as possible to prevent an increase in resistance

Question 24

What are the two items that wear on a starter generator

Answer 24

Commutator And the brushes

Question 25

What power is the ELT

Answer 25

The ELT battery power