ТEST QUESTIONS
1. Primary power sources include which of the following? A) Main generators, inverters, and external power supplies B) Main generators, inverters, and transformers C) Batteries, inverters, and electronic power supplies D) Batteries, transformers, and electronic power supplies E) The number of conductors and field strength 2. Which of the following factors determines the frequency of an ac generator? A) The field strength and rotor rpm B) The number of conductors and field strength C) The number of conductors and rotor rpm D) The number of magnetic poles and rotor rpm E) Batteries, inverters, and electronic power supplies 3. Which of the following statements describes an advantage of the ac power systems over dc power systems? A) Current is transmitted at a lower level B) Smaller wiring is used C) The ac generator and control/protection components are lighter D) Each of the above E) The output frequency is controlled by regulating the rpm of the PMG field 4. Which of the following is NOT considered common to all ac generators? A) The output frequency is controlled by regulating the rpm of the PMG field B) The output is taken from the stationary armature windings C) Voltage control is accomplished by controlling the strength of the magnetic field D) The output frequency is controlled by regulating the rpm of the rotating magnetic field E) The number of conductors and field strength 5. Which of the following generator connections will supply 208 volts ac to the aircraft? A) A to b B) B to c C) Both 1 and 2 above D) C to ground E) The output frequency is controlled by regulating the rpm of the rotating magnetic field 6. The power generated by a 120-/208-volt ac generator is normally powered by what type of system? A) A four-wire, wye connected, common neutral system B) A four-wire, delta connected, common neutral system C) A three-wire, wye connected system D) A three-wire, delta connected system E) A five-wire, delta connected, common neutral system 7. What phase connects to the aircraft for ground in a four-wire grounded neutral system? A) A phase B) B phase C) C phase D) Neutral E) C to ground 8. Which of the following is an advantage of a brushless aircraft generator? A) Less regulation only B) Longer overhaul period only C) More reliable only D) More reliable and longer overhaul periods E) A slipping clutch 9. What device provides the driving force for a generator? A) A slipping clutch B) A prime mover C) A permanent magnet generator D) A variable pitch clutch E.)The number of conductors and field strength 10. In comparison to a three-wire inverter powersystem, what does a four-wire 120-volt,three-phase, 400-Hz power system provide? A) Automatic distribution so that equal power is maintained in each phase B) Automatic distribution so that equal current and voltages are maintained in each phase C) Improved load balancing per phase D) Current flow stoppage when the leads are unbalanced E) A permanent magnet generator 11. What is the purpose of series starting windings in larger inverters? A) Provide a higher starting torque B) Increase starting current C) Limit frequency build-up D) Improve frequency stability E) Improved load balancing per phase 12. What determines the number of phases in an inverter? A) The independent voltages in the input B) The sets of windings on the rotor C) The poles in the generator field D) The sets of windings on the stator E) The dc excitation current in the rotor field of the generator 13. What do we control in order to maintain the output voltage of an inverter at the correct level? A) The dc input voltage to the motor B) The speed of the motor C) The ac excitation current in the rotor field of the generator D) The dc excitation current in the rotor field of the generator E) A variable pitch clutch
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