preclass quizzes 73 & 75 & 19

  1. Input elements and output elements may be shown relative to the PLC program, but they are not part of the PLC program.
    true
  2. All symbols in a PLC prgram are programming statements, and they do not represent input or output elements
    true
  3. A PLC ladder logic program shows diagrams of input elements and output elements.
    false
  4. The LLCD, that electricians are so familiar with, looks just like a ladder logic PLC program, and it functions the same way.
    true
  5. The purpose for the ladder logic circuit diagram (LLCD) is to simplify and organize a large number of loads and contacts (switches).
    true
  6. When several rungs are combined the whole circuit diagram looks like a
    ladder
  7. The horizontal part from left to right is caled a
    rung
  8. The vertical line from top to bottom on the right represents the
    neutral or ground
  9. The vertical line from top to bottom on the left represents the
    power rail or ground
  10. The symbol -||- represents an electrical ____ and is drawn on the ______.
    contact, left
  11. The symbol -()- represents an electrical ____ and is drawn on the ______.
    load, right
  12. Any -|/|- input instruction will be true if the corresponding bit in memory is
    0
  13. Any -| |- input instruction will be true if the corresponding bit in memory is
    1
  14. The PLC program in Fig-2 is more efficient because it
    • both of these
    • uses one bit less of memory
    • has only one rung to execute
  15. In Figure-4, rung-1 is a _____ rung.
    • seal-in
    • latch
    • both of these
  16. In Figure-4, the motor should not be energized if memory-M contains a ____.
    0
  17. In Figure-4, the motor should be energized if memory-M contains a ____.
    1
  18. In Figure-3, instruction-B will be _____ if a non-conventional NO-Stop-switch-B is not pressed, which makes memory-bit B=0.
    true
  19. In Figure-3, instruction-B will be _____ if a non-conventional NO-Stop-switch-B is pressed, which makes memory-bit B=1.
    false
  20. In Figure-4, instruction-B will be _____ if the Stop switch is not pressed.
    true
  21. In Figure-4, instruction-B will be _____ if the Stop switch is pressed.
    false
  22. In Figure-4, instruction-A will be _____ if the Start switch is not pressed
    false
  23. In Figure-4, instruction-A will be _____ if the Start switch is pressed.
    true
  24. In Figure-3, memory-B will contain a ____ if a non-conventional NO-Stop-switch-B is not pressed.
    0
  25. In Figure-3, memory-B will contain a ____ if a non-conventional NO-Stop-switch-B is pressed.
    1
  26. In Figure-4, memory-B will contain a ____ if the Stop switch is not pressed.
    1
  27. In Figure-4, memory-B will contain a ____ if the Stop switch is pressed.
    0
  28. In Figure 4, memory-A will contain a ____ if the Start switch is not pressed.
    0
  29. In Figure 4, memory-A will contain a ____ if the Start switch is pressed.
    1
  30. In Figure-4, the symbol "R" references:
    • PLC-program output instruction
    • bit memory
    • both of these
  31. In Figure-4, the symbol "M" references:
    • output-module port
    • all three of these
    • PLC-program output instruction
    • bit memory
  32. In Figure-4, the symbol "B" references:
    • input-module port
    • all three of these
    • bit memory
    • PLC-program input instruction
  33. In Figure-4, symbol "A" references:
    • PLC-program input instruction
    • all three of these
    • bit memory
    • input-module port
  34. The cooling of the power resistor (oven) is
    variable, depending on the LabVIEW output
  35. The heat to the power resistor (oven) is
    constant
  36. The current out of LabVIEW is [0-10V]/(10.820k Ohms).
    true
  37. The 0-10V control signal that drives the Fan-Driver Circuits comes from
    labVIEW
  38. The primary circuit at the bottom is the
    Fan-Driver Circuit
  39. The voltage applied to the thermistor bridge is regulated to a constant value that is approximately
    12V
  40. The opamp output voltage in the thermistor circuit is
    (Vx-Vy)*10/1.2
  41. The voltage across the 3.9k Ohm resistor is
    Vx
  42. The voltage across the thermistor is
    Vy
  43. The gain of the opamp in the Thermistor Circuit is
    10/1.2
  44. The opamp configuration in the Thermistor Circuit is a
    differential amplifier
  45. The fixed resistors in the thermistor bridge were selected so that the opamp output voltage is in the range 0 to 10V.
    true
  46. The thermistor temperature range is room temperature to 120 degF.
    true
  47. The thermistor is a ______ resistor, which varies as a function of _____.
    variable, temperature
  48. The thermistor is a resistor. When combined with three other resistors, the four resistors form a
    resistor bridge
  49. The thermistor is shown as a ___ in a circle.
    T
  50. The output of the Thermistor circuit becomes input to
    LabVIEW
  51. The output of the Thermistor circuit is a voltage signal [0-10]volts.
    true
  52. The top circuit is the
    Thermistor circuit
  53. Three circuits are shown:
    Thermistor circuit and Fan-Driver Circuit and Oven Circuit
  54. The heat chamber is a power resistor (oven), and inside
    are thermistor and thermocouple
Author
lacythecoolest
ID
329422
Card Set
preclass quizzes 73 & 75 & 19
Description
uses figures 9075 & 9018
Updated