* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Answers
Control theory wikipedia , lookup
Solar micro-inverter wikipedia , lookup
Variable-frequency drive wikipedia , lookup
Pulse-width modulation wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Phone connector (audio) wikipedia , lookup
Integrating ADC wikipedia , lookup
Buck converter wikipedia , lookup
Flip-flop (electronics) wikipedia , lookup
Power electronics wikipedia , lookup
Schmitt trigger wikipedia , lookup
Immunity-aware programming wikipedia , lookup
Switched-mode power supply wikipedia , lookup
1.Basically, the function of a PLC is to: a.amplify various weak signal sources. b.control a high voltage output with a low voltage input. c.control the speed of motors. d.make logical decisions and provide outputs. AMEM 326 – Dr. Sotiris Omirou 2. The scan time is the time required a. to record the status of all input devices. b. to record the status of all output devices. c. to execute one cycle of the total program. d. for the information to pass from one circuit to another within the PLC AMEM 326 – Dr. Sotiris Omirou 1 3. Unlike general purpose computers, PLCs are a. very expensive. b. harder to program. c. designed for the industrial environment. d. all of the above. AMEM 326 – Dr. Sotiris Omirou 4. A programmed normally closed PLC contact a. with a bit status of 1 will not allow current to flow through the contact. b. is examined for an OFF condition. c. is examined for an ON condition. d. both a and b. AMEM 326 – Dr. Sotiris Omirou 2 5. Parallel connections of a ladder logic program are typically called a.rungs. b.networks. c.coils. d.branches AMEM 326 – Dr. Sotiris Omirou 6. The last element to be entered in a ladder logic rung is a(n): a.coil. b.contact. c.EXAMINE IF CLOSED. d.EXAMINE IF OPEN. AMEM 326 – Dr. Sotiris Omirou 3 7. Which module of the PLC is responsible for performing logical operations ? a. Processor b. Input c. Output d. Power supply AMEM 326 – Dr. Sotiris Omirou 8. The status bit of switches and pushbuttons connected to a PLC is stored in the: a. input image table b. output image table file c. user program d. all of the above AMEM 326 – Dr. Sotiris Omirou 4 9. In ladder logic programs, all outputs are represented by: a. contact symbols b. coil symbols c. schematic load devices d. branches AMEM 326 – Dr. Sotiris Omirou 10. The addressing format used with PLCs: a. is always a five digit code b. is always represented using the octal number system c. is standard for all manufacturers d. none of these AMEM 326 – Dr. Sotiris Omirou 5 11. A rung consists of: a. b. c. d. one or more inputs and only one output a series of inputs and a series of outputs NC or NO contacts. pushpush-buttons or toggle switches AMEM 326 – Dr. Sotiris Omirou 12. . Each complete horizontal line of a ladder logic diagram is generally referred to as a. rung b. branch c. input d. output AMEM 326 – Dr. Sotiris Omirou 6 13. The abbreviations NO and NC represent the electrical state of switch contacts when: power is applied b. power is not applied c. the switch is actuated d. the switch is not actuated a. AMEM 326 – Dr. Sotiris Omirou 14. A limit switch is usually actuated by: a. hand b. pressure c. contact with an object d. an electromagnet AMEM 326 – Dr. Sotiris Omirou 7 15. Solenoid valves are available to control: a. oil flow b. air flow c. water flow d. all of these AMEM 326 – Dr. Sotiris Omirou 16. . Field or real world devices refer to a. input devices only b. output devices only c. load devices only d. all devices that are physically wired to the PLC. AMEM 326 – Dr. Sotiris Omirou 8 17. The three main components of PLCs are the input module, CPU, and a. actuator module b. output module c. operator interface d. input device AMEM 326 – Dr. Sotiris Omirou 18. . Prior to PLCs, many control tasks were solved with a. hard-wired controls b. actuator-sensor controls c. programmable-logic d. computer-controllers AMEM 326 – Dr. Sotiris Omirou 9 19. . A signal which varies continuously is called a. digital b. analog c. continuous d. variable AMEM 326 – Dr. Sotiris Omirou 20. The binary concept makes use of the fact that certain information a. can exist in one of two possible states b. can be broken down into smaller units for easier analysis c. can be divided into two or more categories d. can be divided into two, or multiple of two, categories AMEM 326 – Dr. Sotiris Omirou 10 21. In conventional logic circuits, binary 1 represents a. b. c. d. the presence of a signal a high voltage level the occurrence of some event all the above AMEM 326 – Dr. Sotiris Omirou 22. A single rung of a ladder logic program is arranged with a. Input conditions connected from left to right, with the output at the far right. b. Input conditions connected from right to left, with the output at the far left. c. The output in the center and the input conditions to the left and right of it. d. All input conditions in parallel and all output conditions in series. AMEM 326 – Dr. Sotiris Omirou 11 23. Which of the following is not a factor in determining the total scan time of PLC? a. Memory protection. b. Program content. c. Program length. d. Total number of inputs and outputs used. AMEM 326 – Dr. Sotiris Omirou 24. Programmed counters can: a. count up. b. count down. c. be combined to count up and down. d. all of these. AMEM 326 – Dr. Sotiris Omirou 12 25. 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 AMEM 326 – Dr. Sotiris Omirou 26. Unlike the TON timer, the RTO timer requires a(n): a. timer reset instruction. b. input condition instruction. c. internal relay instruction. d. instantaneous contact instruction. AMEM 326 – Dr. Sotiris Omirou 13