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Anatech Electronics

Electricity - Basic Navy Training Courses

Here is the "Electrician's Mate 3 - Navy Training Courses" (NAVPERS 10548) in its entirety (or will be eventually). It should provide one of the Internet's best resources for people seeking a basic electricity course - complete with examples worked out. See copyright. See Table of Contents.

- U.S. Government Printing Office; 1949



1. Complete the following statements:
   (a) To produce a blue print you project a strong light through the tracing onto
         a __________ paper.
   (b) Proper care and use of blueprints requires that they:
         1. Be kept out of strong __________.
         2. Are not allowed to get __________.
         3. Be marked, when necessary, with a __________ pencil.

2. Complete the following statements:
    (a) Each Bureau of Ships electrical drawing is designated by numbers and letters
         grouped in three blocks, of which
            1. The left-hand block indicates the ship __________ and the number of the
                ship in that __________.
            2. The center block indicates the __________ in which the circuit is classified.
            3. The right hand block gives the drawing's file number within the __________.
   (b) To find which S-group a circuit is classified under, you look it up
         in the __________ __________ __________.
   (c) Each BuShips print of a circuit or piece of equipment on board ship will have
        an __________, __________, and __________ number on it.
   (d) Drawings of electrical equipment in turrets or mounts are issued by
        Bureau of __________.
   (e) Turret or mount electrical drawings are identified by:
           1. __________ number.
           2. __________ designation of the mount or turret.

3. Complete the following statements:
   (a) In a blue print of an object:
           1. Visible object lines are shown by heavy __________ lines.
           2. Dimension lines are shown by __________ solid lines.
           3. Invisible object lines are shown by heavy __________ lines.
           4. Center lines of holes or shafts are shown by alternate and __________ lines.

4. Complete the following statements:
   (a) In electrical wiring diagrams:
           1. __________ symbols are used to show each conductor and all connections.
           2. __________ symbols are used to show location and lay-out of circuit.
           3. __________ symbols specify watertightness.
           4. Watertightness is shown on the symbols by a __________ line.
   (b) An orthographic view shows an object as seen __________ to your line of vision.
   (c) An orthographic drawing should show as many views of the object as are
        necessary to give a __________ description of the object.
   (d) The orthographic views of an object should be grouped on the drawing in the
         same __________ positions they have on the object.
   (e) In preparing an orthographic drawing:
           1. Decide right __________ of views.
           2. Block in of __________ views.
           3. Build up __________ of each view.
           4. Give each view its proper name and __________.
           5. __________ drawing.
   (f) The scale of a drawing refers to size of the drawing relative to __________
        of the object.

5. Complete the following statements:
   (a) A drawing in which the object is shown exactly as it appears to the eye is
         called a __________.
   (b) An isometric drawing shows an object in __________ dimensions.
   (c) In an isometric drawing the vertical edges of the object are shown by __________
        lines, its horizontal edges by lines drawn at __________ to the horizontal.

6. Complete the following statements:
   (a) Decks are named and numbered according to their location above or below
         the __________ deck.
   (b) A partial deck between two full decks is called a __________.
   (c) A partial deck below the lowest complete deck is called a __________.
   (d) Decks are numbered using the __________ deck as reference level.
   (e) A letter __________ precedes the number to denote a half-deck.

7. Complete the following statements:
   (a) Ships are divided into sections by bulkheads __________ the ship.
   (b) Sections are labeled A, B, C, D, from __________ to __________.
   (c) Compartments are the space divisions within __________.
   (d) Compartments are designated by:
           1. numbers to indicate __________.
           2. letters to indicate __________.
   (e) All compartments markings consist of three groups of numbers and letters, of which:
           1. The first group indicates the __________ of the ship the compartment is in.
           2. The second group indicates, in order: (1) __________ level, (2) __________
               of ship compartment is on; (3) __________ or __________ position of
               compartment in the section.
           3. The third group indicates the __________ of the compartment.

8. Give the uses of compartments designated by the following symbols:
       Symbol                    Compartment use

9. Complete the following statements:
   (a) Compartments extending through 2 decks are designated by a number after
         the __________ letter.
   (b) Each piece of machinery is designated by three groups of numbers of which:
           1. The first group indicates the __________.
           2. The second groups indicates the __________.
           3. The third group indicates __________ or __________ position.

10. Complete the following statements:
   (a) The machinery installation in a mount or turret for a particular job is called an
         __________ assembly.
   (b) Each such assembly is indicated by:
           1. A __________ indicating the job it does.
           2. A __________ and __________ number to indicate the particular design of
              such assembly.
   (c) The assembly to which each piece of electrical equipment belongs is indicated
        on its __________.
   (d) To find the drawing for a piece of electrical equipment in a mount or turret, first
         find out what ordnance __________ it is part of.
   (e) Drawings of electrical equipment which is part of an ordnance assembly should be
        obtained from the __________ or __________.

11. Complete the following statements:
   (a) Elementary wiring diagrams are used to:
           1. Check __________ in a circuit.
           2. Make initial __________.
   (b) An isometric wiring diagram shows a circuit's __________.
   (c) To show location of an electrical system on different decks, isometric wiring diagrams
        show the decks arranged in __________.
   (d) Isometric wiring diagrams show section-, division-, and compartment __________.
   (e) Isometric wiring diagrams identify cables by __________ and __________.
   (f) Wiring deck plans:
          1. Show __________ deck position of cables and equipment.
          2. Are used for __________.
          3. In case of power and lighting systems, include a list of __________
              and __________.
          4. Are always drawn to a scale of 1/4 inch equals __________.
          5. Show one or more __________ on one drawing.

12. How do electrical wiring diagrams save time in troubleshooting?

13. Complete the following statements:
   (a) The circuit breaker to a particular load trips open. A check of the load circuit at the
         switchboard shows a ground in the circuit. You locate the ground by the following
         steps in the order given:
           1. Break out __________ and __________ wiring diagrams for the load circuit.
           2. Disconnect __________ power from the load circuit.
           3. Open junction box of load circuit nearest __________, break all connections,
               check all circuits emanating from a box for grounds with megger.
           4. After locating grounded branch, __________ all connections in box and
               replace box cover.
           5. Move along grounded cable to next connection box, repeat steps __________
               and __________ above.
           6. Repeat steps __________, __________, and __________ above until faulty
               cable fixture or electrical machine is located.





1. (a) light-sensitive
    (b) 1. sunlight
          2. wet
          3. yellow

2. (a) 1. class, class
          2. S-group

          3. S-group
    (b) Navy Filing Manual
    (c) index, group, file
    (d) ordnance
    (e) 1. serial 2. BuOrd

3. (a) 1. solid
          2. light
          3. broken
          4. dash, dot

4. (a) 1. Elementary
         2. schematic
         3. schematic
         4. double
    (b) perpendicular
    (c) complete
    (d) relative
    (e) 1. combination
         2. outlines
         3. details
         4. dimensions
         5. check
    (f) actual size

5. (a) perspective
    (b) three dimensions
    (c) vertical, 30°

6. (a) main
    (b) half
    (c) platform
    (d) main
    (e) H

7. (a) across
    (b) fore, aft
    (c) sections
    (d) 1. location 2. use
    (e) 1. section
          2.   1. deck 2. side 3. fore, aft
          3. use

8. Gun and torpedo battery
    Ship control and fire control
    Ammunition Storage

9. (a) section
    (b) 1. deck level
         2. frame
         3. port, starboard

10. (a) ordnance
      (b) 1. name
           2. mark, mod
      (c) name plate
      (d) assembly
      (e) gunnery officer, chief Gunner's Mate

11. (a) 1. connections 2. hook-up
      (b) layout
      (c) tiers
      (d) bulkheads
      (e) number, size
      (f)  1. exact  2. construction  3. materials, equipment  4. 1 inch  5. systems

12. Save time in tracing circuits

13. 1. elementary, schematic
      2. all
      3. switchboard
      4. remake
      5. 3, 4
      6. 3, 4, and 5
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