In a four-wire grounded system, if the N wire (common return) were accidentally placed in contact with a ground, what effect, if any,

would this have on circuit operation?

A) It would cause one circuit to bleed into another

B) It would cause intermittent operation of the circuit

C) The circuit would not operate at all

D) Itwould have no effect on circuit operation

E) Grounding the B phase only

23. In a grounded three-wire system, how is grounding normally accomplished?

A) Grounding the B phase only

B) Grounding both the A and the B phases

C) Grounding both the B phase and the neutral wire

D) Grounding both the A phase and the neutral wire

E) The circuit would not operate at all

24. Which of the following is an advantage of an ungrounded electrical system over a grounded electrical system?

A) The system is easier to troubleshoot

B) Cost, weight and space are minimized

C) One circuit may bleed into another

D) Circuits are insulated from one another

E) Grounding both the A phase and the neutral wire

25. Which of the following is a characteristic of a single-phase voltage regulating system?

B) Its simple design allows its use in high-power requirements

C) Its simple design allows its use in low-power requirements

D) Its complex design allows its use in high-power requirements

E) The ground power monitor relay would not energize

26. When an overheat occurs in a transformer-rectifier, which of the following functions does the thermostat perform?

A) Turns off the overheat warning light

B) Disconnects the input ac voltage

C) Disengages the overrunning clutch

D) Engages the fan motor

E) It is used to power high voltage circuits

27. In which of the following ways does an auto-transformer differ from a conventional transformer?

A) It is used to power high voltage circuits

B) It has multi-tap outlets

C) It has one winding that is common to both the primary and secondary windings

D) It is used to step down voltage only

E) Disengages the overrunning clutch

28. What is the value of the power load in the circuit?

A) 260 watts

B) 480 watts

C) 600 watts

D) 720 watts

E) 360 watts

29. A variac transformer provides which of the following functions?

A) Continuous control of line voltage only

B) Maximum transfer of power to the load only

C) Control of only 10% of line voltage

D) Voltage adjustment, regulation, and control

E) To isolate the systems from each other

30. Why is it necessary for high-performance aircraft to have several electronic power supply systems?

A) To isolate the systems from each other

B) To make changes within a particular system easier

C) To provide back-up for a failed system

D) To provide sufficient power for all systems

E) Control of only 10% of line voltage

31. When a positive potential is applied from the secondary of transformer T7 to the junction between CR7 and CR9, what combination of rectifiers will conduct?

A) CR7 and CR8

B) CR7 and CR9

C) CR8 and CR9

D) CR8 and CR10

E) CR6 and CR8

32. If the dc voltage input increases, which of the following events will occur?

A) The voltage drop across R1 will increase

B) The voltage drop across R2 will decrease

C) The input voltage to amplifier A1 will decrease

D) The feedback voltage across R3 and R4 to the input of amplifier A1 will increase

E) The voltage drop across R3 will increase

33. Which of the following uses will shorten the life of an aircraft battery, if done frequently?

A) Servicing equipment only

B) Engine starts only

C) Engine starts and servicing equipment

D) Charging from the ac generator and transformer rectifiers

E) To prevent battery overcharging

34. In a battery vent system, what is the purpose of the sump jar?

A) To act as an electrolyte reservoir

B) To prevent battery overcharging

C) To prevent electrolyte spillage

D) To neutralize gases and excess battery solution

E) To prevent battery overcharging

35. The ac/dc hydraulic motor driven generator provides power to which of the following circuits?

A Flight control circuits only

B) Bombing circuits only

C) Essential circuits only

D) Tactical equipment circuits only

E) To prevent electrolyte spillage

36. Why are APUs particularly useful in aircraft?

A) They automatically replace malfunctioning main generators

B) They provide a variable frequency output

C They depend upon aircraft engines for their source of power

D) They make the aircraft independent of ground power sources

E) Tactical equipment circuits only

37. What section of the compressor and turbine assembly supplies bleed air for pneumatic power?

A) Turbine

B) Turbine wheel

C) Compressor

D) Compressor wheel

E) Turbine compressor wheel

38. What are the four main systems of the gas turbine engine?

A Electrical, fuel control, bleed air, and lubrication

B) Turbine, accessory, compressor, and electrical

C) Turbine, accessory, bleed air, and electrical

D) Turbine, electrical, bleed air, and main output drive

E) Electrical, fuel control,

39. Which of the following statements describes the operation of the ignition system?

A) A continuous spark ignition is required during run time

B) The high-energy ignition source is obtained by discharging a booster coil into the storage capacitors

C) The high voltage required to fire the ignition plug is obtained by discharging the capacitors through a step-down transformer

D) Ignition is required only during starts and automatically cuts out at 95% engine rpm

E) Turbine, electrical, bleed air, and main output drive

40. Which of the following conditions will cause the CSD to go into underdrive?

A) An engine overspeed

B) An intermediate gearbox overspeed

C) An accessory gearbox overspeed

D) A main gearbox overspeed

E) Turbine, electrical, bleed air, and main output drive

41. The electrical circuit of the ac control system is protected during an underspeed condition by what component?

A) A relay

B) A diode

C) A pressure switch

D) A proximity switch

E) Circuit protection only

42. Which of the following is a function of the supervisory panel for the generator and its associated equipment?

A) Frequency regulation and circuit protection

B) Circuit protection only

C) Voltage regulation only

D) Voltage regulation and circuit protection

E) Circuit protection

43. Under which of the following conditions will the supervisory panel disconnect the generator from the load?

A) Frequency and undervoltage only

B) Underfrequency, undervoltage, and overvoltage conditions only

C) Feeder fault, underfrequency, and undervoltage only