5-39. What  type  of  spectrum  interference occupies  a  relatively  large  part  of the  electromagnetic  spectrum? 1. Broadband 2. Narrowband 3. Wideband 4. Shorthand 5–40. What  type  of  spectrum  interference is usually caused by arcing or corona,    and causes most EMI problems  in  digital  equipment? 1. Broadband 2. Narrowband 3. Wideband 4. Shorthand 5–41. Arcing or corona is generated in which of the following ways? 1. By  worn  or  improperly  installed brushes  of  motors  or generators  and  arcing  of contacts  in  electrical controllers  or  stepping switches 2. By ignition systems of motor vehicles  and  igniters  for  jet engines 3. By  defective  fluorescent  lights and defective power lines or power  transformers 4. Each of the above 5–42. Improperly  bonded  lifelines, rigging,  and  stanchions  produce  a significant amount of EMI by acting as  nonlinear  mixing  devices  and antennas, receiving a number of different  transmitted  frequencies, mixing them,   and  reradiating  them over a broad spectrum. 1. True 2. False 5–43. What type of EMI is basically blocked out by a ship’s steel hull and  construction? 5–44. Which  of  the  following  factors  must be  considered  for  shipboard installation  of  computer  and digital  equipment? 1. Equipment  location  and  source of power 2. Equipment  shielding  and system/equipment   grounds 3. Interconnecting  cables 4. All of the above 5-45. As you finish working on an equipment,  which  of  the  following procedures  concerning  EMI  should you follow before you return the equipment  to  use? 1. Ensure that all cover plates are  installed  and  fastened correctly,   and ensure that all drawers  are  secured  correctly 2. Check  all  EMI–reducing  contacts and/or wire gaskets for their condition. Replace them as necessary 3. Both 1 and 2 above 4. Ensure that all power being supplied to the equipment is filtered 5–46. Which  of  the  following  statements concerning  interconnecting  cables used in shipboard electronic and digital  systems  is  NOT  correct? 1. All  interconnecting  cables should  be  shielded  cables 2. Cables  for  digital  equipments and audio should always run parallel to and in the same cableways as other cables, such as cables carrying rf signals and  high–power–pulse  cables 3. The shield and connector shell should  be  electrically connected  and  properly  secured at both ends 4. Shielding protects the data and voice cables from EMI to a great  extent 1. Narrowband 2. Broadband 3. Natural 4. Man–made 34