EXERCISES, LESSON 4
INSTRUCTIONS: Answer the following exercises by circling the lettered response that
best answers the question.
After you have answered all of the exercises, turn to "Solutions to Exercises" at
the end of the lesson and check your answers. For each exercise answered incorrectly,
reread the lesson material referenced after the solution.
Which of the following statements concerning the system design for the A-DEC
dental operating unit is correct?
a. One of the functions of the air pre-regulator is to supply the air that allows
water to enter the utility module.
b. Another regulated air line from the utility module feeds water to activate the
The foot switch becomes the source of water for the cup filler valve and bowl
d. A water actuated diaphragm, controlled by the water pre-regulator, adjusts the
system delivery water pressure gauge.
Which of the following is the purpose of the control blocks?
a. To house the air coolant flow control and the syringe flow controls.
b. To control the flow of air to the foot control switch.
To control the routing of air and water coolant and drive air to the handpieces.
d. To provide air to an air actuated diaphragm that adjusts the system delivery
water pressure gauge.