EXERCISES, LESSON 3
INSTRUCTIONS: Answer the following items by completing the statement or by writing
the answer in the space provided at the end of the item.
After you have completed all of these items, turn to "Solutions to Exercises" at the
end of the lesson and check your answers with the solutions.
The scissors arm spring supports the X-ray head in a drift-free condition. When
removing the X-ray head which of the following cautions must you observe?
a. Remove the scissors arm before removing the X-ray head.
b. Secure the scissors arm at a 45 angle before removing the X-ray head.
Secure the scissors arm with a strap in a semi-open position
(6 inch separation).
d. Flatten the scissors arm to a 180 angle before removing the X-ray head.
Which of the following statements is true about the functioning of the
a. The Heliodent 70 X-ray tube is directly heated, i.e., the heater and the high
voltage are switched on simultaneously.
b. The Heliodent operates from the line with damping because the AR relay
shorts the resistor R18 and separates the resistor R20 from the power source.
The AR relay drops only as the trigger switch is released.
d. You measure the tube current between points X and Y since an alternating
current flows there.