Avionics Reviewer Final PDF

1. Long Range Navigation (LORAN) systems Ans. Alternating current to direct current determine aircraft location by 13. Which type of dc generator is not used as an Ans. Means of pulsed signals transmitted airplane generator? from ground s...

1. Long Range Navigation (LORAN) systems Ans. Alternating current to direct current determine aircraft location by 13. Which type of dc generator is not used as an Ans. Means of pulsed signals transmitted airplane generator? from ground stations Ans. Series wound 2. Integrated drive generators (IDG) employ a 14. What does a rectifier do? type of high output ac generator that utilizes Ans. Changes alternating current to Ans. A brushless system to produce direct current current 15. When handling a high voltage capacitor in an 3. If the IDG scavenge oil filter is contaminated electrical circuit, be sure it with chunks or pieces of metal Ans. It is fully discharge before removing Ans. Remove and replace the IDG it from the circuit 4. (Refer to Figure 19.) Upon completion of 16. Which of the following is most likely to cause the landing gear extension cycle, the green thermal runaway in a nickel-cadmium light illuminated and the red light remained battery? lit. What is the probable cause? Ans. Excessive current draw from the battery 17. How can it be determined if a transformer winding has some of its turns shorted together? Ans. Transformer will get hot in normal operation 18. If one switch is used to control all navigation lights, the lights are most likely connected Ans. Short in the up limit switch Ans. Parallel to each other and in series 5. If any one generator in a 24-volt dc system with the switch shows low voltage, the most likely cause is 19. The voltage in an ac transformer secondary Ans. An out of adjustment voltage that contains twice as many loops as the regulator primary will be 6. In an ac circuit with no phase lead or lag, Ans. Greater and the amperage less than which is true? in the primary Ans. Real power equals apparent power 20. (Refer to Figure 18.) Which of the batteries 7. When ac generators are operated in parallel, are connected together incorrectly? the Ans. Frequency and voltage must be both equal 8. 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 Ans. Strength of the magnetic field 9. The pole pieces or shoes used in a dc generator are a part of the Ans. 3 Ans. Field assembly 21. In an ac circuit with no phase lead or lag, 10. How many cycles of ac voltage are which is true? produced in a six-pole alternator of the Ans. Real power equals apparent power revolving-field type for each revolution of the 22. A CSD unit that is disconnected in flight, due rotor? to a malfunction such as overtemperature, Ans. Three may be reconnected 11. A series-wound dc electric motor will Ans. Only on the ground by maintenance normally require personnel Ans. More current at low rpm than at high 23. A CSD unit drives a generator through the rpm use of 12. The purpose of a rectifier in an electrical Ans. A variable hydraulic pump and system is to change hydraulic motor 24. The working voltage of a capacitor in an ac 29. (Refer to Figure 9.) How many instruments circuit should be (voltmeters and ammeters) are installed Ans. at least 50 percent greater than the correctly? highest applied voltage 25. (Refer to Figure 4.) How much power is being furnished to the circuit? Ans. Two 30. (Refer to Figure 10.) What is the measured voltage of the series-parallel circuit between terminals A and B? Ans. 2,645 watts 26. (Refer to Figure 6.) If resistor R(5) is disconnected at the junction of R(4) and R(3) as shown, what will the ohmmeter read? Ans. 3.0 volts 31. If three resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series in a 28-volt circuit, how much current will flow through Ans. 3ohms the 3-ohm resistor? 27. (Refer to Figure 7.) If resistor R(3) is ans. 0.93 ampere disconnected at terminal D, what will the 32. (Refer to Figure 11.) Find the total current ohmmeter read? flowing in the wire between points C and D. Ans. Infinite resistance 33. (Refer to Figure 11.) Find the voltage 28. (Refer to Figure 8.) With an ohmmeter across the 8-ohm resistor. connected into the circuit as shown, what will the ohmmeter read? Ans. 24 volts Ans. 10 ohms 34. (Refer to Figure 12.) Find the total 40. (Refer to Figure 15.) When the landing gear resistance of the circuit. is down, the green light will not come on if an open occurs in wire Ans. no. 6 41. (Refer to Figure 16.) What will be the effect if the PCO relay fails to operate when the left-hand tank is selected? Ans. 21.2 ohms 35. (Refer to Figure 13.) Determine the total current flow in the circuit. Ans. the fuel pressure crossfeed valve Ans. 1.4 amperes open light will not illuminate 36. (Refer to Figure 14.) The total resistance of 42. (Refer to Figure 16.) The TCO relay will the circuit is operate if 24-volts dc is applied to the bus and the fuel tank selector is in the Ans. cross feed position 43. (Refer to Figure 16.) With power to the bus and the fuel selector switched to the right-hand tank, how many relays in the system are operating? Ans. Three 44. (Refer to Figure 16.) When electrical power is applied to the bus, which relays are Ans. 17 ohms energized? 37. A 48-volt source is required to furnish 192 Ans. PCC to TCC watts to a parallel circuit consisting of three 45. (Refer to Figure 16.) Energize the circuit resistors of equal with the fuel tank selector switch selected to value. What is the value of each resistor? the left-hand position. Using the schematic, ans. 36 ohms identify the switches that will change 38. (Refer to Figure 15.) With the landing gear position. retracted, the red indicator light will not come Ans. 5,6,11,12,13,15,16 on if an open occurs in wire 46. (Refer to Figure 17.) Which of the components is a potentiometer? Ans. no. 19 39. (Refer to Figure 15.) The No. 7 wire is used to Ans. 3 Ans. close the PUSH-TO-SET circuit 47. (Refer to Figure 17.) The electrical symbol represented at number 5 is a variable Ans. capacitor 48. (Refer to Figure 18.) When the landing 54. Static dischargers help eliminate radio gears are up and the throttles are retarded, interference by dissipating static electricity the warning horn will not sound if an open into the atmosphere at occurs in wire Ans. low current levels 55. What may be used to clean deicer boots? Ans. soap and water NOTE: PAG MAY NAKITANG 24 YUN NA AGAD! Ans. no. 4 49. (Refer to Figure 18.) The control valve switch must be placed in the neutral position when the landing gears are down to ans. prevent the warning horn from sounding when the throttles are closed 50. (Refer to Figure 19.) Under which condition will a ground be provided for the warning horn through both gear switches when the throttles are closed? Ans. left gear up and right gear down down 51. (Refer to Figure 19.) When the throttles are retarded with only the right gear down, the warning horn will not sound if an open occurs in wire ans. no. 5 52. (Refer to Figure 19.) When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire ans. no. 6 53. (Refer to Figure 20.) Troubleshooting an open circuit with a voltmeter as shown in this circuit will Ans. permit the battery voltage to appear on the volt meter