Cold-cathode tube operation. If the source voltage in figure 2A isincreased to 150 volts and the ammeterreads 20 milliamperes, what is theresistance (rkp) of the tube?1. 2.65 k2. 5.25 k3. 6.25 k4. 8.15 kThe electron gun of the CRT serveswhich of the following functions?1. Deflects electrons into the plate2. Concentrates electrons into a beam3. Emits electrons4. Both 2 and 3 aboveWhich of the following is a descriptionof the grid in a CRT? 1. A metal cap with a hole in the2. A metal cap at ground potential3. A metal cap with a positive4. A metal cap with a wire screen inWhat element of a television CRT isadjusted by the brightness control?3. Control grid4. Focusing anodeWhich of the following elements of theCRT helps prevent the beam ofelectrons from diverging?3. Focusing anode4. Decelerating anodeWhich of the following elements of aCRT has the highest positive potential?1. The focusing anode2. The electronic lens3. The accelerating anode4. The decelerating anodeWhat is the name of the florescentmaterial that coats the inside face of aWhat is the purpose of the aquadagcoating in the CRT?1. It is used as a plate2. It is used to focus the beam3. It eliminates the space charge4. It eliminates the effects of