TECHGEN-SB-ELECT-TOTAL-TEST&LEARN

1. Pulling the fire shutoff handle causes a number of devices to disconnect. In respect of the AC generator it can be said that the:




2. The speed of an asynchronous four-pole motor fed at a frequency of 400 Hertz is:





3. The VHF direction finder uses the following wavelengths:





4. The Automatic Direction Finder uses the following wavelengths:





5. Direct current generators are connected:





6. A feeder fault on a direct current circuit results from a flux unbalance between the:





7. The type of windings commonly used in DC starter motors are:





8. The voltage of a fully charged lead-acid battery cell is:





9. In an alternator rotor coil you can find:





10. In computer technology, an input peripheral is a:





11. To ensure correct load sharing between AC generators operating in parallel:





12. Because of the input/output relationship of an OR gate, it is often referred to as the:





13. In order that DC generators will achieve equal load sharing when operating in parallel, it is necessary to ensure that:





14. A 3 phase AC generator has 3 separate stator windings spaced at:





15. When the supply frequency in a circuit with a capacitor is increased, the current in this circuit will:





16. On an aeroplane using AC as primary power supply, the batteries are charged in flight from:





17. Immediately after starting engine(s) with no other electrical services switched on, an ammeter showing a high charge rate to the battery:





18. In aviation, the reflection on ionosphere layers phenomenon is used in the following frequencies:





19. In aviation, the reflection on ionosphere layers phenomenon is used in the following frequencies:





20. The wavelength of a radio transmitted on frequency 121.95 MHz is:





21. If one of the 12 cells of a lead-acid battery is dead, the battery:





22. When the AC generators are connected in parallel, the reactive loads are balanced by means of the:





23. In order to produce an alternating voltage of 400 Hz, the number of pairs of poles required in an AC generator running at 6000 rpm is:




24. In an AC power generation system, the Constant Speed Drive (CSD):
1 - can be disconnected from the drive shaft.
2 - can be disconnected from the generator.
3 - is a hydro-mechanical system.
4 - is an electronic system.
5 - can not be disconnected during flight.
6 - can be disconnected during flight.
The combination regrouping all the correct statements is:





25. An inverter is a:





26. The main purpose of a Constant Speed Drive unit is to:





27. The type of gate which requires all conditions with logic 1 for engagement is:





28. The frequency which corresponds to a wavelength of 12 cm is:





29. The wavelength of a radio signal transmitted at the frequency of 75 MHz is:





30. The wavelength of a radio signal transmitted at the frequency 118.7 MHz is:





31. When the AC generators are connected in parallel, the reactive loads are balanced by means of the:





32. The power required for field excitation of the main rotor in modern constant-frequency alternators is directly controlled by:





33. The alternators, when connected, are usually connected:





34. Alternating current can be derived from direct current by:





35. When a persistent under excitation fault is detected on an AC generator connected to the aircraft mains with another AC generator, the protection device opens:





36. On detection of a persistent phase unbalance on an AC generator connected to the aircraft mains, with another AC generator, the protection device opens:





37. A static converter is powered by:





38. In an aircraft electrical system where AC generators are not paralleled mounted, the changeover relay allows:





39. The advantages of grounding the negative pole of the aircraft structure are:
1. Weight saving
2. Easy fault detection
3. Increase of short-circuit risk
4. Reduction of short-circuit risk
5. Circuits are not single-wired lines.
The combination regrouping all the correct statements is:





40. Electrical bonding of an aircraft is used to:
1. protect the aircraft against lightning effects.
2. reset the electrostatic potential of the aircraft to a value approximating 0 volt
3. reduce radio interference on radio communication systems
4. set the aircraft to a single potential
The combination regrouping all the correct statements is:





41. The wavelength of a non-directional beacon (NDB) at a frequency of 300 kHz is:





42. The minimum airborne equipment required for operation of a the VHF direction finder is a:





43. The VHF Omnirange (VOR) uses the following wavelengths:





44. The Instrument Landing System (ILS) uses the following wavelengths:





45. The Distance Measuring Equipment (DME) uses the following wavelengths:





46. The high Altitude Radio Altimeter uses the following wavelengths:





47. A thermal circuit breaker:





48. The Auxiliary Power Unit (APU) has its own AC generator that:





49. A magnetic circuit-breaker is:





50. The conditions to be met to activate a shunt generator are:
1. presence of a permanent field
2. closed electrical circuit
3. generator terminals short-circuited
4. minimum rotation speed
The combination of correct statements is:





51. A "Zener" diode is used for:





52. To reverse the direction of rotation of shunt-type (parallel field) DC electric motor, it is necessary to:





53. The advantages of alternating current on board an aircraft are:
1. simple connection
2. high starting torque
3. flexibility in use
4. lighter weight of equipment
5. easy to convert into direct current
6. easy maintenance of machines.
The combination of correct statements is:





54. On board present aircraft, the batteries used are mainly Cadmium-Nickel. Their advantages are:
1. low risk of thermal runaway
2. high internal resistance, hence higher power
3. good charging and discharging capability at high rating
4. wider permissible temperature range
5. good storage capability
6. sturdiness owing to its metal casing
7. the electrolyte density remains unchanged during charging.
The combination of correct statement is:





55. On detection of a persistent overvoltage fault on an AC generator connected to the aircraft AC busbars, the on-board protection device opens:





56. When a persistent top excitation limit fault on an AC generator connected to the mains with another AC generator, the over excitation protection device opens:





57. When an under speed fault is detected on an AC generator connected to the aircraft AC bus bar, the protection device opens the:





58. The voltage regulator of a DC generator is connected in:





59. On starting, in a brushless AC generator with no commutator rings, the generator is activated by:





60. The capacity of an accumulator is:





61. The purpose of static wick dischargers is to:





62. The output of a generator is controlled by:





63. The rating of electrical fuses is expressed in:





64. A relay is:





65. The capacity of a battery is given in:





66. It may be determined that an aircraft is not properly bonded if:





67. In the response curve of an amplifier, the bandwidth is:





68. Static dischargers:
1. are used to set all the parts of the airframe to the same electrical potential
2. are placed on wing and tail tips to facilitate electrical discharge
3. are used to reset the electrostatic potential of the aircraft to a value approximating 0 volts
4. are located on wing and tail tips to reduce interference with the on-board radio communication systems to a minimum
5. limit the risks of transfer of electrical charges between the aircraft and the electrified clouds
The combination regrouping all the correct statements is:





69. A relay is:





70. The most widely used electrical frequency in aircraft is:





71. Assume a constant speed DC generator providing a constant output voltage. If the electrical load increases, the voltage regulator will:





72. The so-called "hot buses" or "direct buses" are:





73. In flight, if the constant speed drive (CSD) temperature indicator is in the red arc the:





74. The reason for using inverters in an electrical system is ..





75. The essential difference between aircraft AC alternators and DC generators (dynamos) is that the:





76. Skip distance is the:





77. A radio signal looses strength as range from the transmitter increases, this is called:





78. In computer technology, an output peripheral is a:





79. In computer technology, a storage peripheral is a:





80. The skip zone of HF-transmission will increase when the following change in circumstance occurs:





81. A test to assess the state of charge of a lead-acid battery would involve:





82. When an "open circuit" occurs in an electrical supply system, the:





83. When two DC generators are operating in parallel, control of load sharing is achieved by:





84. Because of the connection in parallel of electrical equipments on an AC bus bar, isolation of individual equipments:





85. In an aircraft equipped with a DC main power system, AC for instrument operation may be obtained from:





86. If a current is passed through a conductor which is positioned in a magnetic field:





87. The moving part in an AC generator is usually referred to as the:





88. The function of a constant speed drive (CSD) in an AC generating system is to:





89. If two constant frequency AC generators are operating independently, then the phase relation between both generators:





90. A bus-bar is:





91. A CSD of an AC generator may be disconnected in flight. The primary reason(s) for disconnection are:





92. A CSD unit which has been disconnected in flight:





93. When carrying out battery condition check using the aircraft's voltmeter:





94. Connecting two 12 volt 40 ampere-hour capacity batteries in series will result in a total voltage and capacity respectively of:





95. When a conductor cuts the flux of a magnetic field:





96. The purpose of a voltage regulator is to control the output voltage of the:





97. A current limiter fuse in a DC generation system is used to:





98. The purpose of bonding the metallic parts of an aircraft is to:





99. On the flight deck, an oil operated CSD unit is normally provided with means of monitoring the:





100. An AC generator driven by a CSD unit:





101. Assuming a CSD fault is indicated, the CSD should be disconnected:





102. When operating two AC generators unparalleled, the phase relationship of each generator:





103. When AC generators are operated in parallel, they must be of the same:





104. The measured output power components of a constant frequency AC system are:





105. "Frequency wild" in relation to a AC generation system means the generator:





106. In an aeroplane fitted with a constant frequency AC power supply, DC power is obtained from a:





107. Regarding Ohm's law:





108. A "trip-free" type circuit breaker is a circuit protection device which:





109. When a battery is almost fully discharged there is a tendency for the:





110. The frequency of an AC generator is dependent on the:





111. Circuit breakers protecting circuits may be:





112. The function of a CSD in an AC generating system is to:





113. The Central Processing Unit (CPU) of a computer essentially consists of:
1. an Arithmetic and Logic Unit (ALU)
2. a control and timing unit
3. Registers.
The combination which regroups all the correct statements is:





114. Because of the input/output relationship of an AND gate, it is often referred to as the:





115. A unit that converts electrical DC into AC is:





116. The function of a NOT logic gate within a circuit is to:





117. Regarding (1) a fuse and (2) a circuit breaker:





118. A condenser in parallel with breaker points will





119. A Constant Speed Drive aims at ensuring





120. In an on-board computer, the software is





121. On-board electrical systems are protected against faults of the following type:
1. AC generator over-voltage
2. AC generator under-voltage
3. over-current
4. over-speed
5. under-frequency
6. undue vibration of AC generators.
The combination of correct statements is:





122. The resistors R1 and R2 are connected in parallel. The value of the equivalent resistance (Req) so obtained is given by the following formula:





123. In the propagation of MF waves, the phenomenon of FADING is particularly found:





124. The purpose of a battery control unit is generally to isolate the battery:
1 - from the bus when the battery charge has been completed
2 - when there is a battery overheat condition
3 - in case of an internal short circuit
4 - in case of a fault on the ground power unit.
The combination which regroups all of the correct statements is:





125. The connection in parallel of two 12 volt/ 40 amp hours batteries, will create a unit with the following characteristics;





126. The frequency of the current provided by an alternator depends on...





127. The function of the Generator Breaker is to close when the voltage of the:





128. (For this question use annex 021- 6660A-PRECEDING SLIDE) The logic symbol shown represents (assuming positive logic):




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