PLC Quiz

What does PLC stand for?

• Programmable Logic Controller

• Pre-programmed Logic Circuit

• Programmable Linear Circuit

• Physical Logic Controller

Before PLCs, what was used to control systems?

• Transistors

• Microprocessors

• Banks of relays

• Integrated circuits

How would relays control other relays to form logic controllers?

• By using complex algorithms

• By using a central processing unit

• By using physical wiring

• By using a programming language

What replaced the common logic part of the banks of relays?

• Electrical substations

• Solid state electronics

• Physical wiring

• Software logic

What do PLCs monitor before making a decision?

• Their outputs

• Their software

• Their inputs

• The relay output

What is often used in combination with PLCs to directly deal with automation tasks?

• Sensors

• Relays

• Barcodes

• Conveyors

What does a PLC do after scanning a barcode at the airport?

• It prints a new barcode.

• It loads the bag onto the plane.

• It decides if the bag should be diverted based on a set of rules.

• It checks the weight of the bag.

What type of inputs can only provide information on whether something is either on or off?

• Analog inputs

• Digital inputs

• Voltage inputs

• Current inputs

What does the CPU typically consist of?

• A hard drive and a memory chip.

• A microprocessor and a memory chip to store the program.

• A graphics card and a power supply unit.

• A network card and an audio interface.

Which of the following is NOT a component mentioned as part of the PLC system in the text?

• Modbus and LAN connections

• A small screen for user interface

• A time clock and calendar

• An antenna for wireless communication