transicion rac 65

1. (8805) - Electric wire terminals for most aircraft applications must be what type?. Slotted. Hook. Ring.

2. (8813) The only practical method of maintaining a constant voltage output from an aircraft generator under varying conditions of speed and load is to vary the. strength of the magnetic field. number of conductors in the armature. speed at which the armature rotates.

3. (8836) Which of the following is most likely to cause thermal runaway in a nickel-cadmium battery?. A high internal resistance condition. Excessive current draw from the battery. Constant current charging of the battery to more than 100 percent of its capacity.

4. (8818) In a generator, what eliminates any possible sparking to the brush guides caused by the movement of the brushes within the holder?. The brush pigtail. Brush spring tension. Undercutting the mica on the commutator.

5. (8924) What is the frequency of an alternator dependent upon?. Voltage. RPM. Current.

6. (8927) In troubleshooting an electrical circuit, if an ohmmeter is properly connected across a circuit component and some value of resistance is read,. the component has continuity and is open. either the component or the circuit is shorted. the component has continuity and is not open.

7. (8928) CSD driven generators are usually cooled by. oil spray. an integral fan. both ram air and an integral fan.

8. (8929) A CSD unit drives a generator through the use of. a synchronous electric motor. an infinitely variable mechanical gearing system. a variable hydraulic pump and hydraulic motor.

9. (8930) Integrated drive generators (IDG) employ a type of high output ac generator that utilizes. brushes and slip rings to carry generated dc exciter current to the rotating field. battery current to excite the field. a brushless system to produce current.

10. (8931) If the Integrated Drive Generator (IDG) scavenge oil filter is contaminated with metal, you should. do an oil analysis to diagnose the problem. remove and replace the IDG. replace the oil and filter at 25 hour intervals.

11. (8808) What is a cause of generator brush arcing?. Seating brushes with No. 000 sandpaper. Carbon dust particles. Low spring tension.

12. (8912.2) Static inverters are electronic devices that change DC to AC with the. use of an oscillator. properties of an exclusive OR gate. input from an amplifier control by integrated circuits.

13. (8820) The type of electric wire terminals used for most aircraft applications, in addition to providing good current carrying capabilities, are designed primarily. to prevent circuit failure due to terminal disconnection. for uncomplicated and rapid circuit connection and disconnection. for permanent connection to the circuit.

14. (8821) Aluminum wire must be stripped very carefully because. high resistance will develop in stripping nicks. stripping nicks can cause short circuits. individual strands will break easily after being nicked.

15. (8932) When necessary during operation, CSD disconnect is usually accomplished by. a switch in the cockpit. circuit breaker activation. a shear section in the input shaft.

16. (8933) A CSD unit that is disconnected in flight, due to a malfunction such as overtemperature, may be reconnected. automatically if the temperature falls back into the normal operating range. manually by the flightcrew. only on the ground by maintenance personnel.

17. (8823) An ammeter in a battery charging system is for the purpose of indicating the. amperage available for use. total amperes being used in the airplane. rate of current used to charge the battery.

18. (8845) When approved, splices may be used to repair manufactured harnesses or installed wiring. The maximum number of splices permitted between any two connectors is. one. two. three.

19.(8826) What is the color and orientation of the position lights for navigation on civil airplanes?. Left side - green, right side - red, rear aft - white. Left side - red, right side - green, rear aft - white. Left side - white, right side - green, rear aft - red.

20. (8828) A voltage regulator controls generator output by. introducing a resistance in generator-to-battery lead in the event of overload. shorting out field coil in the event of overload. varying current flow to generator field coil.

21. (8831) During ground operation, aircraft generator cooling is usually accomplished by. auxiliary air cooled through an air/fuel heat exchanger. an integral fan. an external motor-driven fan.

22. (8832) What does a rectifier do?. Changes direct current into alternating current. Changes alternating current into direct current. Reduces voltage.

23. (8833) What type of instrument is used for measuring very high values of resistance?. Megohmmeter. Shunt-type ohmmeter. Multimeter.

24. (8834) When a diode is checked for an open circuit or a short circuit, it should be. in the circuit. checked with a milliamp ammeter. disconnected from the circuit.

25. (8838) Which of the following are the major parts of a dc motor? 1. Armature assembly. 2. Field assembly. 3. Brush assembly. 4. Commutator. 5. Pole piece. 6. Rheostat. 7. End frame. 1, 2, 3, 7. 2, 3, 4, 5. 3, 5, 6, 7.

26. (8840) For general electrical use in aircraft, the acceptable method of attaching a terminal to a wire is by. crimping. soldering. crimping and soldering.

27. (8841) Which of the following factors must be taken into consideration when determining the wire size to use for an aircraft installation? 1. Mechanical strength. 2. Allowable power loss. 3. Ease of installation. 4. Resistance of current return path through the aircraft structure. 5. Permissible voltage drop. 6. Current carrying capability of the conductor. 7. Type of load (continuous or intermittent). 2, 5, 6, 7. 1, 2, 4, 5. 2, 4, 6, 7.

28. (8847) The most common method of attaching a pin or socket to an individual wire in an MS electrical connector is by. crimping. soldering. crimping and soldering.

29. (8842) When selecting hardware for attaching bonding connections to an aircraft structure, which of the following should be considered? 1. Mechanical strength. 2. Allowable power loss. 3. Ease of installation. 4. Permissible voltage drop. 5. Amount of current to be carried. 6. Type of load (continuous or intermittent). 1, 3, 5. 4, 5, 6. 1, 2, 3.

30. (8850) If several long lengths of electrical cable are to be installed in rigid conduit, the possibility of damage to the cable as it is pulled through the conduit will be reduced by. a. dusting the cable with powdered soapstone. a. dusting the cable with powdered graphite. applying a light coat of dielectric grease.

31. (8843) How should the splices be arranged if several are to be located in an electrical wire bundle?. Staggered along the length of the bundle. Grouped together to facilitate inspection. Enclosed in a conduit.

32. (8843) How should the splices be arranged if several are to be located in an electrical wire bundle?. Ten times the outside diameter of the bundle. Five times the outside diameter of the bundle. Fifteen times the outside diameter of the bundle.

33. (8853) Aircraft fuse capacity is rated in. volts. ohms. amperes.

34. (8846) AN/MS electrical connectors are specifically designed to meet. Technical Standard Order (TSO) specifications. military specifications. nternational Civil Aviation Organization (ICAO) standards.

35. (8849) The voltage output of an alternator may be regulated by controlling the. speed of the alternator. voltage output of the dc exciter. resistance in the rotor windings.

36. (8851) Grounding is electrically connecting a conductive object to the primary structure. One purpose of grounding is to. prevent current return paths. allow static charge accumulation. prevent development of radio frequency potentials.

37. (8852) What is normally used to bond noncontinuous stainless steel aircraft components?. Stainless steel jumpers. Copper jumpers. Aluminum jumpers.

38. (8854) When adding a rheostat to a light circuit to control the light intensity, it should be connected in. parallel with the light. series with the light. series parallel with the light switch.

39. (8855) Circuits that must be operated only in an emergency or whose inadvertent activation could endanger a system frequently employ. guarded switches. push-pull-type circuit breakers only (no switches). spring-loaded to off toggle or rocker switches.

40. (8856) If one switch is used to control all navigation lights, the lights are most likely connected. in series with each other and parallel to the switch. in series with each other and in series with the switch. parallel to each other and in series with the switch.

41. (8857) Oil canning of the sides of aluminum or steel electrical junction boxes is considered to be. normal operation in vibration prone areas. a shorting hazard. acceptable operation.

42. (8859) During inspection of the terminal strips of an aircraft electrical system, it should be determined that. only locknuts have been used for terminal attachment to the studs. the terminal studs are anchored against rotation. only plain nuts and lockwashers have been used for terminal attachment to the studs.

43. (8860) What protection to wires and cables does conduit provide when used in aircraft installations?. Electromagnetic. Mechanical. Structural.

44. (8861) Which of the following should be accomplished in the installation of aircraft wiring?. Support the bundle to structure and/ or solid fluid lines to prevent chafing damage. Provide adequate slack in the wire bundle to compensate for large changes in temperature. Locate the bundle above flammable fluid lines and securely clamp to structure.

45. (8862) If the (+) terminal of a voltmeter is connected to the (-) terminal of the source voltage and the (-) terminal of the meter is connected to the (+) terminal of the source voltage, the voltmeter will read. correctly. low voltage. backwards.

46. (8871) Which of the following copper electrical cable sizes should be selected to replace a No. 6 aluminum electrical cable?. No. 4. No. 6. No. 8.

47. (8863) When using the voltage drop method of checking circuit resistance, the. input voltage must be maintained at a constant value. output voltage must be maintained at a constant value. input voltage must be varied.

48. (8865) Aircraft electrical junction boxes located in a fire zone are usually constructed of. asbestos. cadmium-plated steel. stainless steel.

49. (8867) The primary considerations when selecting electric cable size are. current-carrying capacity and allowable voltage drop. the voltage and amperage of the load it must carry. the system voltage and cable length.

50. (8868) The navigation lights of some aircraft consist of a single circuit controlled by a single switch which has an ON position and an OFF position, with no additional positions possible. This switch is referred to as a. double-pole, single-throw (DPST), two-position switch. single-pole, double-throw (SPDT), two-position switch. single-pole, single-throw (SPST), two-position switch.

51. (8869) Electric circuits are protected from overheating by means of. thermocouples. shunts. fuses.

52. (8877) How should a voltmeter be connected?. In series with the source. In parallel with the load. In series with the load.

53. (8870) How does the routing of coaxial cables differ from the routing of electrical wiring?. Coaxial cables are routed parallel with stringers or ribs. Coaxial cables are routed at right angles to stringers or ribs. Coaxial cables are routed as directly as possible.

54. (8879) If it is necessary to use an electrical connector where it may be exposed to moisture, the mechanic should. coat the connector with grease. use a special moisture-proof type. spray the connector with varnish or zinc-chromate.

55. (8873) Which statement relating to electric wiring is true?. When attaching a terminal to the end of an electric cable, it should be determined that the strength of the cable-to-terminal joint is at least twice the tensile strength of the cable. When attaching a terminal to the end of an electric cable, it should be determined that the strength of the cable-to-terminal joint is at least equal to the tensile strength of the cable itself. All electric cable splices should be covered with soft insulating tubing (spaghetti) for mechanical protection against external abrasion.

56. 8875) What kind of switch should you install in a single wire circuit that required the switch to be manually held in the ON position?. Single-pole, single-throw (SPST), two-position normally open (NO). Single-pole, single-throw (SPST), single-position. Single-pole, double-throw (SPDT), single-position normally open (NO).

57. (8876) A circuit breaker is installed in an aircraft electrical system primarily to protect the. circuit and should be located as close to the source as possible. circuit and should be located as close to the unit as possible. electrical unit in the circuit and should be located as close to the source as possible.

58.(8904) A voltage regulator controls generator voltage by changing the. resistance in the generator output circuit. current in the generator output circuit. resistance of the generator field circuit.

59. (8878) A circuit protection device called a current limiter is essentially a slow-blow fuse and is designed to be used in. 400 cycle AC circuits. heavy power circuits. starter-generator circuits.

60. (8858) Electric wiring installed in aircraft without special enclosing means (open wiring) offers the advantages of ease of installation, simple maintenance, and reduced weight. When bundling open wiring, the bundles should. be limited as to the number of cables to minimize damage from a single electrical fault. include at least one shielded cable to provide good bonding of the bundle to the airframe. be limited to a minimum bend radius of five times the bundle diameter to avoid excessive stresses on the cable insulation.

61. (8880) The three kinds of circuit-protection devices used most commonly in aircraft circuits are. circuit breakers, resistors, and current limiters. circuit breakers, fuses, and current limiters. circuit breakers, capacitors, and current limiter plug-ins mechanical reset types.

62. (8881) If a wire is installed so that it comes in contact with some moving parts, what protection should be given the wire?. Wrap with soft wire solder into a shield. Wrap with friction tape. Pass through conduit.

63. (8886) What is the advantage of a current limiter?. It breaks circuit quickly. It can be reset easily. It will take overload for a short period.

64. (8882) In the American Wire Gauge (AWG) system of numbers used to designate electrical wire sizes, the number assigned to a size is related to its. combined resistance and current-carrying capacity. current-carrying capacity. cross-sectional area.

65. (8883) What is the voltage drop for a No. 18 copper wire 50 feet long to carry 12.5 amperes, continuous operation? Use the formula VD = RLA VD = Voltage drop R = Resistance per ft = .00644 L = Length of wire A = Amperes. 1/2V. 1V. 4V.

66. (8895) Certain transport aircraft use ac electrical power for all normal operation and battery furnished dc electrical power for standby emergency use. In aircraft of this type that operate no dc generators, the batteries are kept charged by. inverters which use the aircraft's ac generators as a source of power. alternators which use the aircraft's generators as a source of power. rectifiers which use the aircraft's ac generators as a source of power.

67. (8885) What is the advantage of a circuit breaker when compared to a fuse?. Never needs replacing. Always eliminates the need of a switch. Resettable and reusable.

68. (8888) In aircraft electrical systems, automatic reset circuit breakers. should not be used as circuit protective devices. are useful where only temporary overloads are normally encountered. must be used in all circuits essential to safe operation of the aircraft.

69. (8890) When considering an alteration, the criteria upon which the selection of electric cable size should be based are. applied voltage and allowable voltage drop. current-carrying capacity and allowable voltage drop. current-carrying capacity and applied voltage.

70. (8891) What is an important factor in selecting aircraft fuses?. The current exceeds a predetermined value. The voltage rating should be lower than the maximum circuit voltage. Capacity matches the needs of the circuit.

71. (8892) The circuit breaker in the instrument lighting system protects the. lights from too much current. wiring from too much current. wiring from too much voltage.

72. (8896) The voltage in an ac transformer secondary that contains twice as many loops as the primary will be. greater and the amperage less than in the primary. greater and the amperage greater than in the primary. less and the amperage greater than in the primary.

73. (8905) The overvoltage control automatically protects the generator system when excessive voltage is present by. opening the shunt field circuit. opening and resetting the field control relay. breaking a circuit to the trip coil of the field control relay.

74. (8887) Where electric cables must pass through holes in bulkheads, formers, ribs, firewalls, etc., the wires should be protected from chafing by. wrapping with electrical tape. using a suitable grommet. wrapping with plastic.

75. (8907) What is the maximum amount of time a circuit can be in operation and still be an intermittent duty circuit?. Three minutes. Two minutes. One minute.

76. (8921) How are generators rated?. Watts at rated voltage. Amperes at rated voltage. The impedance at rated voltage.

77. (8909) (Refer to Figure 18.) Which of the batteries are connected together incorrectly?. 1. 2. 3.

78. (8917) An aircraft electrical circuit control relay is. an electronically operated switch. a device which converts electrical energy to kinetic energy. any conductor which receives electrical energy and passes it on with little or no resistance.

79. (8910) (Refer to Figure 19.) Upon completion of the landing gear extension cycle, the green light illuminated and the red light remained lit. What is the probable cause?. Short in the down limit switch. Short in the gear safety switch. Short in the up limit switch.

80. (8918) The purpose of a rectifier in an electrical system is to change. a. the frequency of alternating current. direct current to alternating current. alternating current to direct current.