16 _______________________________________ IN ANSWERING QUESTIONS 2-47 THROUGH 2-56, SELECT FROM COLUMN B THE ELEMENT OF THE CRT WHICH PROVIDES THE FUNCTION DESCRIBED IN COLUMN A. YOU MAY USE THE ELEMENTS IN COLUMN B MORE THAN ONE TIME. A. FUNCTIONS   B. ELEMENTS   2-47.   Reduces interelectrode capacitance   1. Cathode   2-48.  Controls electrons   2.  Control grid   2-49.  Source of electrons   3.  Focusing anode   2-50.  Accelerates electrons   4. ^Accelerating         anode   2-51.  Focuses electrons into a beam   A. FUNCTIONS   B. ELEMENTS   2-52.   Acts as suppressor grid   1. Vertical deflection   plates   2-53.  Displays electron beam   2.  Horizontal      deflection plates   2-54.  Deflects beam to right   3.  Aquadag coating   2-55.  Deflects beam to down position   4.  Screen   2-56.  Eliminates secondary emission   _______________________________________ 2-57.     Which of the following actions must you take first before disposing of a cathode-ray tube?   1.    Place the CRT carefully in a dumpster   2.    Throw the CRT into deep water   3.    Return the CRT to supply   4.    Render the CRT harmless 2-58. What is the purpose of adding radioactive material to electron tubes?   1.     The material reduces secondary emissions   2.     The material aids ionization in the tube   3.     The material increases therminonic emission   4.     The material causes the tube to glow in the dark 2-59. Safety precautions and procedures for working with radioactive electron tubes can be found in which of the following publications?   1.     Radiation, Health, and Protection Manual   2.     Decontamination of Radioactivity Manual   3.     Technical Manual for RF Radiation Hazards   4.     Radiation Hazards of Shipboard Equipment Manual