EXERCISES, LESSON 3
INSTRUCTIONS. The following exercises are to be answered by marking the lettered
response that best answers the Question, or by completing the incomplete statement, or
by writing the answer in the space provided at the end 'of the Question.
After you have completed all the exercises, turn to "Solutions to Exercises," at the
end of the lesson and check your answers with the Academy solutions.
The function of the autotransformer is to:
a. Stabilize the fixed voltage of the step-down transformer.
b. Act as a voltage regulator to the filament.
Select the primary voltage for x-ray machine circuits.
The filament transformer isolates the high voltage from auto- transfers and:
a. Raises the voltage in the filament circuit.
b. Reduces the amperage in the filament circuit.
Cools the filament.
d. Produces a relatively high amperage.
What electrical device selects the mA to be used in the filament circuit?
a. Step-down transformer.
b. Choke coil.
Main line switch.
d. Thermionic valve tube.