Title: Chapter 1 Test
Course: Programmable Logic Controls (IC 107-IC 107) > Section: Assessments

Q: A PLC's power supply module does not normally supply power to the field devices.
- True
- False
A: True

Q: At the start of the PLC scan the:
- status of all inputs are read
- status of all outputs are updated
- program is executed
- diagnostics and communications tasks are executed
A: status of all inputs are read

Q: Basically, the function of a PLC is to:
- amplify various weak signal sources
- control a high voltage output with a low voltage input
- control the speed of motors
- make logical decisions and control outputs based on them
A: amplify various weak signal sources

Q: PLC proprietary architecture:
- is the opposite to open architecture
- makes it more difficult to connect to devices made by other PLC manufacturers
- does not allow programs to be interchanged between different PLC manufactures
A: is the opposite to open architecture

Q: PLC's were originally designed as replacements for:
- microcomputers
- relay control panels
- analog controllers
- digital controllers
A: microcomputers

Q: Programmable logic controllers are categorized according to the
- number of I/O points
- current rating of I/O modules
- power rating of the I/O modules
- cost of the I/O modules
A: number of I/O points

Q: The central processing unit:
- looks at the inputs, makes the decisions based on the program, and sets the outputs
- looks at the outputs, makes the decision based on the program, and sets the inputs
- serves only to store the program in memory
- serves only to supply power to the backplane
A: looks at the inputs, makes the decisions based on the program, and sets the outputs

Q: The main difference between a PLC and relay control system is that:
- different types of input devices are used
- different types of output devices are used
- different input and output voltage levels are used
- one uses hardwired relay control logic and the other uses programmed instructions
A: different types of input devices are used

Q: The number and type of I/Os cannot be changed in a fixed PLC.
- True
- False
A: True

Q: The output interface module connects to:
- sensing devices such as switches or pushbuttons
- load devices such as lamps or soleniods
- a programming device such as a computer
A: sensing devices such as switches or pushbuttons

Q: The programmable controller operates in real time.
- True
- False
A: True

Q: The programming device must be connected to the controller to run the program.
- True
- False
A: False

Q: The programming device:
- is used to enter the program into the memory of the processor
- is commonly a personal computer
- can be a hand-held device
A: is used to enter the program into the memory of the processor

Q: The scan time is the time required for one complete execution of the user program.
- True
- False
A: True

Q: The scan time is the time required:
- to record the status of all input devices
- to record the status of all output devices
- to execute one cycle of the total program
- for the information to pass from input to output
A: to record the status of all input devices

Q: The symbol –( )– in a ladder logic diagram represents a:
- set of normally closed contacts
- virtual relay coil
- seal-in contact
- field input sensing device
A: set of normally closed contacts

Q: The symbol –| |– in a ladder logic diagram:
- can be thought of as a normally open contact
- represents a capacitor
- is always at logic 0
- is always at logic 1
A: can be thought of as a normally open contact

Q: Unlike personal computers, PLC's are:
- equipped with input and output modules
- equipped with a control programming language
- designed for the industrial environment
A: equipped with input and output modules

Q: Which module of the PLC connects directly to field devices such as pilot lights, motor starters, and solenoids?
- Input
- Output
- Power supply
- Memory
A: Input

Q: Which of the following is not a factor affecting the memory size needed for a particular PLC installation?
- Voltage rating of field devices
- Number of I/O points
- Size of control program
- Supervisory functions
A: Voltage rating of field devices