Cathode Ray Oscilloscope (C.R.O.) Multiple Choice Questions and Answers

41. The cathode of a C.R.O. is usually coated with

   A.Alkali metals

   B.Tungsten or thorium oxide

   C.Copper oxide

   D.Barium or strontium oxide

42. The input impedance of C.R.O. is

   A.Zero

   B.Around 100 ohms

   C.Around 1000 ohms

   D.Around one mega-ohms

43. A C.R.O. can be used to measure

   A.A.C. voltages only

   B.D.C. voltages only

   C.Frequency

   D.Any of the above

44. The brightest spot, on a cathode ray screen, occurs at

   A.The centre

   B.The outer periphery

   C.Midway between centre and outer periphery of screen

   D.Brightness is same all over the screen

45. Phosphor coating for cathode ray tubes is provided on

   A.Inside surfaces only

   B.Outside surfaces only

   C.Both the surfaces

   D.Within the glass

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