3. Industrial Motor Controls Part 2 (2nd try)

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Penn Foster College *

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0086122RR

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Mechanical Engineering

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Dec 6, 2023

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pdf

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student id: 55385260 exam: 006012RR - Industrial Motor Controls, Part 2 When you have completed your exam and reviewed your answers, click Submit Exam . Answers will not be recorded until you hit Submit Exam . If you need to exit before completing the exam, click Cancel Exam . Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer. 1. What would happen if the input device PX1 failed to produce an output, causing no input on IN14 of the roll stand's PLC? A. Both motors M2 and M3 would run until they tripped their overloads. B. Motor M1 for the hydraulic system would keep running. C. The arms would not lower after the roll of paper was finished and the arms lower push button is pressed. D. The arms would continue to open until LS1 and LS4 actuate. 2. If the RUN light on the CPU of a PLC is not illuminated, what should be your next action or check? A. Check for a COMM error light. B. Replace the CPU. C. Issue a START command at the console or laptop. D. Check the power supply's indicator light. 3. Which one of the following terms is used to define the identifying letters placed above an input contact in ladder logic? A. Statement B. Locator C. Title D. Surname 4. What is the purpose of thermostat number 2, IN7, in the mixing vat machine? A. This thermostat is used to monitor the temperature of the incoming fluids. B. This thermostat is used to shut off the heater when the chemical mix reaches setpoint. C. This thermostat is used to prevent an over - temperature condition in the event thermostat one sticks open. D. This thermostat is used to turn off the mixing motor after the mixture reaches temperature. 5. After replacing a faulty CPU module, what is the next action you should take? A. Check the power supply service voltage. B. Reprogram the user memory with ladder logic. C. Issue a RUN or START command. D. Reset the watchdog timer.

6. Where should the shield for the wire between the D/A module and the motor speed controller be connected? A. At the auxiliary power supply B. At the PLC C. At the D/A module D. At the motor speed controller 7. Which one of the following statements is true of a disabled contact or coil? A. The disabled element has been automatically disabled due to module failure. B. A contact must be in the disabled state before it can be forced ON or OFF. C. The disabled element is held false by the PLC. D. A disabled contact or coil is caused by a faulty memory location in the PLC. 8. The PLC motor speed control system you are working on has an analog current loop between the D/A module and the frequency inverter. What is the best method of checking this loop current? A. Measure the voltage between the SIGNAL IN and +10V terminals of the inverter. B. Open one of the signal wires in the loop and install a high - impedance VOM in series with the loop. C. Measure the voltage across the terminals of the D/A module. D. Open the loop and place a low - impedance VOM in series with the loop. 9. Single sweep operation of a PLC is normally used to A. produce an output when a timer reaches preset value. B. debug newly written ladder logic. C. issue a RUN command to the PLC. D. create a negative transition output coil. 10. What would happen if the value of 00240 was increased to 00480 on rung 10 of Figure 34? A. The timer would cause an output to be energized at four minutes. B. The timer would cause an output to be energized at eight minutes. C. The timer would cause an output to be energized at both four and eight minutes. D. The timer would not produce an output since the maximum input value is 00500. 11. If the battery backup fails on a PLC, what will occur? A. The PLC will shut down due to loss of memory as soon as battery voltage drops below a certain level. B. The PLC will illuminate the battery LED and extinguish the RUN LED. C. The PLC will operate normally; however, if power is lost, memory will be lost. D. The PLC may have logic solving errors until the battery is replaced. 12. A photoeye will have which of the following abbreviations? A. PHOTO B. PEYE C. PHEYE D. PE

13. What is the name of the nonprogrammable timer that is used to check the internal operation of the PLC? A. System B. Scan C. Watchdog D. Housekeeping 14. What device on the roll stand machine is used to tell the PLC that the arms have raised to their maximum up position? A. PX1 B. MS1 C. PS1 D. MS2 15. The register that is assigned to a D/A module in a motor speed control circuit must be assigned to that D/A module. How is this done? A. By setting DIP switches B. The registers are previously assigned by the PLC manufacturer. C. By placing the register for the D/A module in a configuration table D. By forcing a value into the register 16. In the pick-and- place robot application, what rung of ladder logic is used to cause the down solenoid to energize when photoeye number one is blocked by a part? A. Rung 5 B. Rung 6 C. Rung 3 D. Rung 4 17. A typical motor speed control circuit that is controlled by an analog current loop will have a current of A. 5- 50 mA. B. 0- 10 mA. C. 2- 20 mA. D. 4- 20 mA. 18. What is the purpose of relay CRE in the roll stand machine? A. Relay CRE is used to power the input modules. B. Relay CRE is used as an emergency stop relay. C. Relay CRE is used to control an alarm light. D. Relay CRE is used to power the PLC. 19. Why are motor current readings from a frequency inverter not exact readings of motor current? A. Because the inverter pulses the motor with various sinewave frequencies

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End of exam B. Because the output of a frequency inverter is not a sinewave C. Because a frequency inverter uses a lower voltage sinewave D. Because a frequency inverter adds a DC voltage level to the AC waveform 20. Where would be the first place to check if a PLC-controlled motor speed control system fails and the motor stops turning? A. At the auxiliary power supply B. At the motor speed controller for signs of an error code C. At the ladder logic for the register assigned to the D/A module D. At the D/A module