MECH 1500 Final Part 2 Review
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1 Name: Class: Date: MECH 1500 Final Part 2 Review True/False Indicate whether the statement is true or false. 1. Programmed counters can serve the same function as mechanical counters. 2. Every PLC model offers some form of counter instruction. 3. Counters are similar to timers, except that they do not operate on an internal clock. 4. The output of the counter is energized whenever the accumulated count is less than or equal to the preset count. 5. PLC counters are normally nonretentive. 6. Some PLC counters operate on the leading edge of the input signal, while others operate on the trailing edge. 7. All PLC manufacturers require the reset rung or line to be true to reset the counter. 8. A transitional off-to-on contact will allow logic continuity for one scan and then open, even though the triggering signal may stay on. 9. A down-counter output instruction will decrement by 1 each time the counted event occurs. 10. In normal use, the down-counter is used in conjunction with the up-counter to form an up/down-counter. 11. All up-counters count only to their preset values, and additional counts are ignored. 12. The counter reset (RES) instruction, it is always given the same address as the counter it is to reset. 13. The counter enable bit is true whenever the counter instruction is false. 14. The counter accumulated value is the current count based on the number of times the rung goes from false to true. 15. The counter number C5:4 represents counter file 5, counter 4 in that file. 16. Encoder pulses can be counted to measure distance. 17. A counter instruction is an input instruction. 18. A counter's input signal can come from an external device such as a sensor. 19. Up and down counters may be programmed together to count up and down. 1
2 Name: 20. Counters can count past their preset values. 21. For the timer relay contact shown, when the relay coil is energized, there is a time delay before the contact closes. 22. For the timer relay contact shown, when the relay coil is de-energized, there is a time delay contact opens. before the 23. For the timer relay contact shown, when the relay coil is de-energized, there is a time delay before the contact closes. 24. For the timer relay contact shown, when the relay coil is energized, there is a time delay before the contact opens. 25. PLC timers are input instructions that provide the same functions as mechanical timing relays. 26. Timer instructions are found on all PLCs manufactured today. 27. The retentive timer reset (RES) instruction is always given the same address as the timer it resets. 28. An alarm is to be switched on whenever a piping system has sustained a cumulative overpressure of 60 s. The most directly applicable timer to use would be the on-delay nonretentive timer. 29. A lamp is to be switched off 10 s after a switch has been switched from it's on to off position. The most directly applicable timer to use would be the off-delay nonretentive timer. 30. When a time-delay period longer than the maximum preset time allowed for a single timer is required, the problem can be solved by programming two or more timers together. 2
3 Name: 31. Normally, the reset input to a timer will override the control input of the timer. 32. A retentive timer must be completely timed out to be reset. 33. Retentive timers lose the accumulated time every time the rung condition becomes false. 34. The instantaneous contacts of a timer have no time-delay period associated with them. 35. The accumulated time of a TOF timer is reset by causing the rung to go true momentarily. 36. A RES (reset) instruction must be used to zero the accumulated value in an RTO timer. 37. A timer's delay time equals the value in the ACC multiplied by the time base. 38. Timers can be retentive or non-retentive. 39. An RTO timer retains the present accumulated value when the rung goes false. 40. A TOF timer starts to accumulate time when the rung becomes true. 41. A TOF timer starts to accumulate time when the rung makes a true to false transition. Multiple Choice Identify the choice that best completes the statement or answers the question. 42. Programmed counters can: a. count up. b. count down. c. be combined to count up and down. d. all of these. 43. The counter instruction is found on: a. all PLCs. b. small-size PLCs. c. medium-size PLCs. d. large-size PLCs. 44. The PLC counter instruction is similar to the: a. internal relay instruction. b. transitional contact instruction. c. relay coil and contact instruction. d. timer instruction. 3
4 Name: 45. The output of a PLC counter is energized when the: a. accumulated count equals the preset count. b. preset count is greater than the accumulated count. c. counter input rung is true. d. counter input rung is false. 46. Which of the following is not usually associated with a PLC counter instruction? a. Address b. Preset value c. Time base d. Accumulated value 47. A PLC up-counter (CTU) counter counts: a. scan transitions. b. true-to-false transitions. c. false-to-true transitions. d. both b and c! 48. When the up-counter reset is set to true, the following happens: a. the preset value is set to 0. b. the preset value increments. c. the accumulated value is set to 0. d. the accumulated value is set to maximum. 49. For the counter table shown, word level addressing is used for: a. CU, CD, DN, OV, UN, and UA b. CU, CD, and DN c. OV and UN d. PRE and ACC 50. In an up-counter, when the accumulated count exceeds the preset count without a reset, the accumulated count will: a. set itself to zero. b. start decrementing. c. continue incrementing. d. hold the accumulated value. 4
5 Name: 51. When the accumulated count exceeds the preset count, the: a. accumulated value is set to zero. b. preset is set to zero. c. reset changes state. d. counter done bit is true. 52. The counter RES instruction: a. is used to reset the counter. b. is given the same reference address as the counter instruction. c. decrements the count when actuated. d. both a and b. 53. For the PLC counter to reset, the counter reset rung must: a. be true. b. be false. c. be either true or false, depending on the manufacturer. d. undergo a true-to-false transition. 54. Normally counters are retentive. This means that if your accumulated count is up to 300 and power to your system is lost, when power is restored the accumulated count will be: a. 000 b. 250 c. 300 d A PLC down-counter (CTD) counter counts: a. scan transitions. b. true-to-false transitions. c. false-to-true transitions. d. both b and c. 56. The accumulated count of a CTD counter: a. increments with each true-to-false transition. b. decrements with each true-to-false transition. c. decrements with each false-to-true transition. d. increments with each false-to-true transition. 57. The accumulated count of a CTU counter: a. increments with each true-to-false transition. b. decrements with each true-to-false transition. c. decrements with each false-to-true transition. d. increments with each false-to-true transition. 5
6 Name: 58. Output PL2 will be energized: a. until the accumulated value equals the preset value. b. when the accumulated value equals the preset value. c. only when the accumulated value exceeds 10. d. only when the accumulated value is zero. 59. The output Lot Full Light will be energized when the accumulated count is: a. 0 c. 100 b. 150 d Certain contacts of a mechanical timing relay are designed to operate at a preset time interval: a. after the coil is energized. c. after power is applied to the circuit. b. after the coil is de-energized. d. either a or b. 6
7 Name: 61. The relay contact drawn is designed to operate so that: a. when the relay coil is energized, there is a time delay in closing. b. when the relay coil is energized, there is a time delay in opening. c. when the relay coil is de-energized, there is a time delay before the contact opens. d. when the relay coil is de-energized, there is a time delay before the contact closes. 62. In the hardwired circuit shown, the light will stay on: a. as long as S1 is closed. b. for 5 s after coil TD is energized. c. for 5 s after coil TD is de-energized. d. both a and c. 63. Which one of the following timer parameters determines the time duration for the timing circuit? a. Accumulated time. c. Timer address. b. Preset time. d. Time base. 64. Which one of the following timer parameters represents the value that increments as the timer is timing.? a. Accumulated time. c. Timer address. b. Preset time. d. Time base 65. Which one of the following timer parameters determines the accuracy of the timer? a. Accumulated time. c. Timer address. b. Preset time. d. Time base. 7
8 Name: 66. For the timer program shown, output B is switched ON when: a. power is applied. b. input A is closed. c. the timer is accumulating time. d. the accumulated value equals the preset value. 67. For the timer program shown, output D is switched ON when: a. power is applied. b. input A is closed. c. the timer is accumulating time. d. the accumulated value equals the preset value. 8
9 Name: 68. For the programmed timer circuit shown, the pilot light should come on: a. as soon as the switch is closed. b. before the switch is closed. c. for 15 seconds after the switch is opened. d. both a and c. 69. The type of timer program shown is a: a. retentive on-delay. b. retentive off-delay. c. nonretentive off-delay d. nonretentive on-delay. 70. To reset a retentive timer, the: a. AC time must be greater than the PR time. b. PR time must be greater than the AC time. c. AC time must equal the PR time. d. none of these. 9
10 Name: 71. The amount of time for which a timer is programmed is called the: a. Preset c. Set Point b. Desired Time d. Lapsed Time 72. When the timing of a device is not reset on a loss of power, the timing is said to be: a. continuous c. retentive b. holding d. saved 73. RES instructions are used with: a. TOF timers c. RTO timers b. TON timers d. all of these Short Answer 74. Draw the logic circuit and complete a truth table for the Boolean equation (A+B)C = Y 75. Draw the logic circuit and complete a truth table for the Boolean equation AB + CD = Y 76. Draw the Ladder Logic for the Boolean equation AB + C = Y Essay 77. Study all your study guides from the quizzes and study all your old quizzes and midterms. 10
11 MECH 1500 Final Part 2 Review Answer Section TRUE/FALSE 1. ANS: T PTS: 1 2. ANS: T PTS: 1 3. ANS: T PTS: 1 4. ANS: F PTS: 1 5. ANS: F PTS: 1 6. ANS: F PTS: 1 7. ANS: F PTS: 1 8. ANS: T PTS: 1 9. ANS: T PTS: ANS: T PTS: ANS: F PTS: ANS: T PTS: ANS: F PTS: ANS: T PTS: ANS: T PTS: ANS: T PTS: ANS: F PTS: ANS: T PTS: ANS: T PTS: ANS: T PTS: ANS: T PTS: ANS: T PTS: ANS: T PTS: ANS: T PTS: ANS: F PTS: ANS: T PTS: ANS: T PTS: ANS: F PTS: ANS: T PTS: ANS: T PTS: ANS: T PTS: ANS: F PTS: ANS: F PTS: ANS: T PTS: ANS: F PTS: ANS: T PTS: ANS: F PTS: ANS: T PTS: ANS: T PTS: 1 1
12 40. ANS: F PTS: ANS: T PTS: 1 MULTIPLE CHOICE 42. ANS: D PTS: ANS: B PTS: ANS: D PTS: ANS: A PTS: ANS: C PTS: ANS: C PTS: ANS: C PTS: ANS: D PTS: ANS: C PTS: ANS: D PTS: ANS: D PTS: ANS: C PTS: ANS: C PTS: ANS: C PTS: ANS: B PTS: ANS: A PTS: ANS: B PTS: ANS: B PTS: ANS: D PTS: ANS: D PTS: ANS: B PTS: ANS: B PTS: ANS: A PTS: ANS: D PTS: ANS: B PTS: ANS: D PTS: ANS: D PTS: ANS: D PTS: ANS: D PTS: ANS: A PTS: ANS: C PTS: ANS: C PTS: 1 2
13 SHORT ANSWER 74. ANS: PTS: 1 3
14 75. ANS: PTS: ANS: PTS: 1 4
15 ESSAY 77. ANS: See the Question PTS: 1 5
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