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Question 1 of 70
1. Question
What device is used to convert alternating current, which has been induced into the loops of the rotating armature of a DC generator, to direct current?
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Question 2 of 70
2. Question
A certain direct current series motor mounted within an aircraft draws more amperes during start than when it is running under its rated load. The most logical conclusion that may be drawn is
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Question 3 of 70
3. Question
The stationary field strength in a direct current generator is varied
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Question 4 of 70
4. Question
What type of electric motor is generally used with a direct-cranking engine starter?
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Question 5 of 70
5. Question
Upon what does the output frequency of an AC generator (alternator) depend?
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Question 6 of 70
6. Question
A high surge of current is required when a DC electric motor is first started. As the speed of the motor increases
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Question 7 of 70
7. Question
Alternators (AC generators) that are driven by a constant-speed drive (CSD) mechanism are used to regulate the alternator to a constant
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Question 8 of 70
8. Question
What is used to polish commutators or slip rings?
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Question 9 of 70
9. Question
If a generator is malfunctioning, its voltage can be reduced to residual by actuating the
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Question 10 of 70
10. Question
If the points in a vibrator-type voltage regulator stick in the closed position while the generator is operating, what will be the probable result?
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Question 11 of 70
11. Question
Why is a constant-speed drive used to control the speed of some aircraft engine-driven generators?
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Question 12 of 70
12. Question
According to the electron theory of the flow of electricity, when a properly functioning DC alternator and voltage regulating system is changing an aircraft’s battery, the direction of current flow through the battery
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Question 13 of 70
13. Question
Aircraft that operate more than one generator connected to a common electrical system must be provided with
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Question 14 of 70
14. Question
The most effective method of regulating aircraft direct current generator output is to vary, according to the load requirements, the
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Question 15 of 70
15. Question
Electric motors are often classified according to the method of connecting the field coils and armature. Aircraft engine starter motors are generally of which type?
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Question 16 of 70
16. Question
As the generator load is increased (within its rated capacity), the voltage will
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Question 17 of 70
17. Question
As the flux density in the field of a DC generator increases and the current flow to the system increases, the
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Question 18 of 70
18. Question
What is the purpose of a reverse-current output relay?
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Question 19 of 70
19. Question
Generator voltage will not build up when the field is flashed and solder is found on the brush cover plate. These are most likely indications of
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Question 20 of 70
20. Question
Why is it unnecessary to flash the field of the exciter or a brushless alternator?
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Question 21 of 70
21. Question
One way that the automatic ignition relight systems are activated on gas turbine engines is by a
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Question 22 of 70
22. Question
How are the rotor windings of an aircraft alternator usually excited?
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Question 23 of 70
23. Question
What precaution is usually taken to prevent electrolyte from freezing in a lead-acid battery?
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Question 24 of 70
24. Question
What is the ampere-hour rating of a storage battery that is designed to deliver 45 amperes for 2.5 hours?
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Question 25 of 70
25. Question
How many hours will a 140 ampere-hour battery deliver 15 amperes?
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Question 26 of 70
26. Question
What is a basic advantage of using AC for electrical power for a large aircraft?
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Question 27 of 70
27. Question
What are two types of AC motors that are used to produce a relatively high torque?
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Question 28 of 70
28. Question
(1) Alternators are rated in volt-amps, which is a measure of the apparent power being produced by the generator.
(2) Alternating current has the advantage over direct current in that its voltage and current can easily be stepped up or down.
Regarding the above statements,
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Question 29 of 70
29. Question
What is the frequency of most aircraft alternating current?
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Question 30 of 70
30. Question
The reason for flashing the field in a generator is to
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Question 31 of 70
31. Question
The part of a DC alternator power system that prevents reverse flow of current from the battery to the alternator is the
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Question 32 of 70
32. Question
The generating system of an aircraft charges the battery by using
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Question 33 of 70
33. Question
The constant current method of charging a nickel-cadmium battery
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Question 34 of 70
34. Question
Refer to Figure 4. The following data concerning the installation of an electrical unit is known: current requirements for continuous operation – 11 amperes; measured cable length – 45 feet; system voltage – 28 volts (do not exceed 1 volt drop); cable in conduit and bundles. What is the minimum size copper electrical cable that may be selected?
Â
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Question 35 of 70
35. Question
Which of the following aircraft circuits does NOT contain a fuse/circuit breaker?
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Question 36 of 70
36. Question
The maximum number of terminals that may be connected to any one terminal stud in an aircraft electrical system is
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Question 37 of 70
37. Question
What is the maximum number of bonding jumper wires that may be attached to one terminal grounded to a flat surface?
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Question 38 of 70
38. Question
Starter brushes should be replaced when they are worn down to
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Question 39 of 70
39. Question
When isolating an electrical switch, under which of the following conditions should the switch be derated from its normal current rating?
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Question 40 of 70
40. Question
The resistance of the current return path through the aircraft is always considered negligible, provided the
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Question 41 of 70
41. Question
In order to reduce the possibility of ground shorting the circuits when the connectors are separated for maintenance, the AN and MS electrical connectors should be installed with the
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Question 42 of 70
42. Question
When does current flow through the coil of a solenoid-operated electrical switch?
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Question 43 of 70
43. Question
When a 28-volt, 75-ampere generator is installed on an aircraft, an electrical load analysis ground check is performed and it is determined that the battery is furnishing 57 amperes to the system, with all electrical equipment operating. This indicates
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Question 44 of 70
44. Question
What type of lubricant may be used to aid in pulling electrical wires or cables through conduits?
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Question 45 of 70
45. Question
Which of the following is regulated in a generator to control its voltage output?
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Question 46 of 70
46. Question
Bonding jumpers should be designed and installed in such a manner that they
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Question 47 of 70
47. Question
When the starter switch to the aircraft gas turbine engine starter-generator is energized and the engine fails to rotate, one of the probable causes would be the
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Question 48 of 70
48. Question
Arcing at the brushes and burning of the commutator of a motor may be caused by
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Question 49 of 70
49. Question
The maximum allowable voltage drop between the generator and the bus bar is
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Question 50 of 70
50. Question
ON-OFF two position engine electrical switches should be installed
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Question 51 of 70
51. Question
When selecting an electrical switch for installation in an aircraft circuit utilizing a direct current motor.
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Question 52 of 70
52. Question
When installing electrical wiring parallel to a fuel line, the wiring should be
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Question 53 of 70
53. Question
Refer to Figure 4. In a 28-volt system, what is the maximum continuous current that can be carried by a single No. 10 copper wire 25 feet long, routed in free air?
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Question 54 of 70
54. Question
What speed must an eight-pole AC generator turn to produce 400 hertz AC?
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Question 55 of 70
55. Question
How many basic types of circuit breakers are used in powerplant installation electrical systems?
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Question 56 of 70
56. Question
Which Federal Aviation Regulation specifies that each resettable circuit protective device requires a manual operation to restore service after the device has interrupted the circuit?
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Question 57 of 70
57. Question
Which Federal Aviation Regulation requirement prevents the use of automatic reset circuit breakers?
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Question 58 of 70
58. Question
The time/current capacities of a circuit breaker or fuse must be
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Question 59 of 70
59. Question
(1) Most modern aircraft use circuit breakers rather than fuses to protect their electrical circuits.
(2) Part 23 requires that all electrical circuits incorporate some form of circuit protective device.
Regarding the above statements,
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Question 60 of 70
60. Question
Electrical switches are rated according to the
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Question 61 of 70
61. Question
Electrical circuit protection devices are installed primarily to protect the
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Question 62 of 70
62. Question
(1) Electrical circuit protection devices are rated based on the amount of current that can be carried without overheating the wiring insulation.
(2) A “trip-free” circuit breaker makes it impossible to manually hold the circuit closed when excessive current is flowing.
Regarding the above statements,
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Question 63 of 70
63. Question
Which of the following Federal Aviation Regulations require that all aircraft using fuses as the circuit protective devices carry “one spare set of fuses, or three spare fuses of each kind required”?
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Question 64 of 70
64. Question
What is the smallest terminal stud allowed for aircraft electrical power systems?
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Question 65 of 70
65. Question
A typical barrier type aircraft terminal strip is made of
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Question 66 of 70
66. Question
A term commonly used when two or more electrical terminals are installed on a single lug of a terminal strip is
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Question 67 of 70
67. Question
(1) Electrical wires larger than 10 gauge use uninsulated terminals.
(2) Electrical wires smaller than 10 gauge use uninsulated terminals.
Regarding the above statements,
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Question 68 of 70
68. Question
Aircraft electrical is manufactured in sizes according to a standard known as
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Question 69 of 70
69. Question
Aircraft wire size is determined by using a(n)
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Question 70 of 70
70. Question
Aircraft copper electrical wire is coated with tin, silver, or nickel in order to
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