NSTM CH 400.txt

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NSTM CH 400.txt
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  1. Electronic equipment should not be installed in magnetic fields having field densities greater than ____micro-teslas unless the equipment is specifically designed to operate in greater field densities.
    500
  2. Hand operated devices including switches, jacks and push buttons shall be located at least __ meters ( ___ feet) but not more than ____ meters (___ feet) above the deck.
    .3 (1 Foot), 3.8 (6 Feet)
  3. Which ESDS class is susceptible to damage from ESD voltages greater than 0 to 1,999 volts.
    Class 1
  4. Which ESDS class is susceptible to damage from ESD voltages of 2,000 to 3,999 volts?
    Class 2
  5. Which ESDS class is susceptible to damage from ESD voltages of 4,000 to 15,999 volts.
    Class 3
  6. Parts, assemblies and equipment susceptible to ESD voltages of _____ or higher are considered non-ESD sensitive.
    16,000
  7. ESD protected areas should maintain a relative humidity of at or near ____ % in the space.
    50
  8. Radar modulator pulse cables and sonar transducer cables are physically separated at least ___ inches from all other cables, except at the point of entrance to the modulator, transmitter, or transducer.
    18
  9. Sonar hydrophone cables are physically separated at least __ inches from all other cables or they are installed in a flexible shielded conduit
    6
  10. Microphone cables are physically separated at least __ inches from all other cables.
    6
  11. Radiation that does not have sufficient energy to strip electrons from atoms is called ________ radiation.
    non-ionizing
  12. Radiation that strips electrons from atoms is called ________/
    ionizing radiation
  13. Penetrating ______ radiation emitted from external sources presents the most difficult hazard to protect against.
    gamma
  14. Modern electron tubes, such as klystrons, magnetrons, thyratrons, cathode ray tubes, and high voltage rectifiers, when operated with electric potentials in excess of _______ volts, may generate X-rays.
    16,000
  15. Microwaves are electromagnetic radiation that ranges from_____ to ______.
    30 MHz to 300 GHz
  16. Microwaves can be lethal when the power intensity and exposure time are suf-
  17. ficient to cause a rise in temperature that exceeds an organism’s homeostatic capabilities; this occurs when the temperature rise exceeds approximately __________.
    5 degrees C (9 degrees F)
  18. UHF and VHF transmission of 100 watts or less from omnidirectional antennas are permissible when the work area is ___ feet or more from the antenna
    20
  19. However, RF burn hazards primarily are limited to communication frequencies and are of most concern at transmissions in the ___ band or below.
    HF
  20. On ships nested alongside or across the pier, VLF, LF, MF and HF transmissions should be secured. However, if the operational necessity dictates, VLF, LF, MF and HF transmissions at _____ watts or lower are permissible.
    100
  21. Operating stations, guard rails, and normal personnel thoroughfares shall be designed to provide at least a __ foot horizontal and __ foot vertical clearance from MF/HF transmitting antennas.
    4, 8
  22. For example, the total force exerted on the overall surface of a 10 inch CRT is nearly _____ pounds, of which _____ pounds is exerted on the face alone.
    2,000 , 1000
  23. Nickel cadmium batteries or cells must be charged only in _______, never in _______.
    series, parallel
  24. The manual charging rate for a nickel cadmium battery is ___, where ″ c ″ is the ampere hour capacity of the battery.
    c/10
  25. A completely discharged battery requires ___ to ___ hours of charging.
    14 to 16
  26. The usual trickle-charge rate of a Nickel Cadmium battery is ____ unless the manufacturer recommends otherwise.
    C/100
  27. Ni-Cad batteries may be discharged between _____ to _____ degrees.
    0F to 100F
  28. Ni-Cad batteries may be stored at approximately ___F
    40 F
  29. Ni-Cad betteries may be discharge at a maximum temperature of _____ or a minimum of ___ for a short time.
    160F,, 60F
  30. At temperatures of over _____, Ni-Cad batteries degradate at an increased rate.
    110 F
  31. Which class of overhaul?
  32. Work that involves such overhaul or repairs, modifications, field changes, ORDALT’s or SHIPALT’s as will sustain or improve the operating and performance characteristics of the system, subsystem, or component being repaired or altered to meet the ″ most recent ″ design and technical specifications for that item. It is intended that the end product be in ″ like new ″ condition in appearance as well as in operation and performance.
    Class A
  33. Which class of overhaul?
  34. Work that requires such overhaul or repairs as well restore the operating and performance characteristics of a system, subsystem, or component to its original design and technical specifications. If it is required to restore the operating and performance characteristics of an item to other than its original design and technical performance specifications, it must be so specified and the performance criteria defined.
    Class B -
  35. Which class of overhaul?
  36. Repair work on a system, subsystem, or component specified by the work request or that work required to correct the particular deficiencies or malfunctions specified by the customer. The repair activity must demonstrate that the work requested has been accomplished or that the conditions or malfunctions described have been corrected, but the repairing activity has no responsibility for the repair or proper operation of the associated components of the equipment or for the operation of the system as a whole
    Class C -
  37. ″ Open, Inspect, and Report ″ work requests are used when the customer cannot be specific about what is or may be wrong with the item. This class of work is intended to be diagnostic and thus may require various tests, followed by inspection, to assist in a complete diagnosis.
    Class D -
  38. Work required to incorporate all alterations and modifications specified for a designated system, subsystem, or component. The repair activity will demonstrate the successful checkout of the work accomplished to assure compliance with the performance standards established for the modification only to the extent of the work performed
    Class E -
  39. A ______ alteration is one which does not affect the operational or military characteristics of a ship.
    technical
  40. A ________ alteration is one which changes or improves the operational or military characteristics of a ship.
    military
  41. A ______ alteration (SHIPALT) is any change in the hull, machinery, equipment, or fittings which involves change in design, materials, number, location or relationship of the component parts of an assembly.
    ship
  42. An _______ is a change effected on naval ordnance equipment or its associated computer programs by the addition, deletion, rework, or replacement of parts in assemblies or
  43. equipment, or by a change in assembly procedures
    ORDALT
  44. A _______ Alteration permits changes to Hull, Mechanical and Electrical (HM & E) equipments and systems where the changes are contained within boundaries of the
  45. individual equipments or systems and have limited system ramifications.
    Machinery
  46. A type __ field change consists of a publications package, all parts, onboard spares materials, special tools, jigs and instruments required to accomplish the change to one equipment and to revise existing equipment nameplates, publications, and charts.
    I
  47. A type __ field change requires parts, none of which are included with the field change. A type II field change consists of a publications package providing instructions for accomplishing the field change and for correcting related publications.
    II
  48. A type ___ field change consists of a publications package and some of the parts, materials, and special tools required to accomplish the field change to one equipment and to revise existing nameplates, publications and charts. (Parts, test equipment, and so forth not included in the field change are stocked onboard or should be requisitioned.)
    III
  49. A type __ field change does not require parts or use of special tools. This type of field change consists of kit consisting of a publications package providing instructions for accomplishing the field change and for correcting related publications.
    IV
  50. A Class __ field change is approved for accomplishment by forces afloat or station personnel; no installation funding is required.
    1
  51. A Class __ field change requires fleet installation funding.
    2
  52. A Class __ field change normally requires industrial assistance for installation and requires the appropriate systems command installation funding.
    3

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