D) To provide air conditioning and heating during ground maintenance

E) The lever cannot be manually actuated

56. The most common method of voltage regulation in ac and dc generators is varying what?

A) The current in the field winding

B) The current in the shunt winding

C) The resistance of the load

D) The resistance of a parallel resistor

E) Varying the strength of the magnetic field

57. Amplitude of the output voltages of an ac generator may be controlled by which of the following methods?

A) Varying the generator rpm

B) Changing the rectifier connections

C) Varying the strength of the magnetic field

D) Tapping off a varying number of turns per winding

E) To provide interior lighting for night maintenance actions

58. Which of the following components changes the exciter’s variable output to dc?

A) Bridge rectifier

B) Voltage regulator

C) Exciter rotating field

D) Main generator rotating field

E) Controlled output voltage

59. What is the result of the action of the voltage regulator in controlling the strength of the generator’s magnetic field?

A) Controlled output voltage

B) Controlled current

C) Controlled frequency

D) Controlled single phase

E) Varying the generator rpm

60. What is represented by the magnitude of the control voltage applied to the control amplifier of a solid-state regulator?

A) The excitation voltage of the ac generator

B) The sum of the generator’s excitation and output voltages

C) The difference between the generator’s ac output voltage and a reference voltage

D) The difference between the generator’s dc excitation voltage and a reference voltage

E) All components of the bridge except CR5, in equal amounts

61. If there were a decrease in generator voltage, the voltage change would appear across which of the following components?

A) All components of the bridge except CR5, but the change would be greater across R2 than across any other resistor

B) All components of the bridge, but the change would be greater across R2 than across any other component

C) All components of the bridge except CR5, in equal amounts

D) R2, R7, and R9, but the change would be greater across R2 than across R7 and R9

E) The exciter generator output increases, the ac generator field strength decreases, and the generator output increases