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1. PLCS were originally designed as replacements for: a) Microcomputers. b) Analog controllers. c) Relay control panels. d) Digital controllers. 2. Which of the following is not an advantage that PLCS offer over the conventional relay-type of control system? a) Smaller size. b) Higher current capacity. c) Less expensive. d) More reliable. 3. The central processing unit; a) Looks at the inputs, makes the decisions based on the program, and sets the outputs. b) Looks at the outputs, makes the decisions based on the program, and sets the inputs. c) Serves only to store the program in memory. d) Serves only to supply power to the backplane.

1. PLCS were originally designed as replacements for: a) Microcomputers. b) Analog controllers. c) Relay control panels. d) Digital controllers. 2. Which of the following is not an advantage that PLCS offer over the conventional relay-type of control system? a) Smaller size. b) Higher current capacity. c) Less expensive. d) More reliable. 3. The central processing unit; a) Looks at the inputs, makes the decisions based on the program, and sets the outputs. b) Looks at the outputs, makes the decisions based on the program, and sets the inputs. c) Serves only to store the program in memory. d) Serves only to supply power to the backplane.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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1) Choose the correct answer for each of the following: 1. PLCS were originally designed as replacements for: a) Microcomputers. b) Analog controllers. c) Relay control panels. d) Digital controllers. 2. Which of the following is not an advantage that PLCS offer over the conventional relay-type of control system? a) Smaller size. b) Higher current capacity. c) Less expensive. d) More reliable. 3. The central processing unit; a) Looks at the inputs, makes the decisions based on the program, and sets the outputs. b) Looks at the outputs, makes the decisions based on the program, and sets the inputs. c) Serves only to store the program in memory. d) Serves only to supply power to the backplane. 4. 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 control outputs based on them. 5. The output interface module connects to: e) Sensing devices such as switches or pushbuttons. f) Load devices such as lamps or solenoids. g) A programming device such as a computer. h) All of the above. 6. A limit switch is usually actuated by a) Contact with an object. b) Pressure. c) Hand. d) An electromagnet.
Transcribed Image Text:1) Choose the correct answer for each of the following: 1. PLCS were originally designed as replacements for: a) Microcomputers. b) Analog controllers. c) Relay control panels. d) Digital controllers. 2. Which of the following is not an advantage that PLCS offer over the conventional relay-type of control system? a) Smaller size. b) Higher current capacity. c) Less expensive. d) More reliable. 3. The central processing unit; a) Looks at the inputs, makes the decisions based on the program, and sets the outputs. b) Looks at the outputs, makes the decisions based on the program, and sets the inputs. c) Serves only to store the program in memory. d) Serves only to supply power to the backplane. 4. 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 control outputs based on them. 5. The output interface module connects to: e) Sensing devices such as switches or pushbuttons. f) Load devices such as lamps or solenoids. g) A programming device such as a computer. h) All of the above. 6. A limit switch is usually actuated by a) Contact with an object. b) Pressure. c) Hand. d) An electromagnet.
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