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Test Bank For Technician's Guide to Programmable Controllers - 6th - 2013 All Chapters - 9781111544096
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Test Bank For Technician's Guide to Programmable Controllers - 6th - 2013 All Chapters
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Test Bank For Technician's Guide to Programmable ControllersChapter 1—What is a Programmable Logic Controller (PLC)?
Chapter 1—What is a Programmable Logic Controller (PLC)?
TRUE/FALSE
1. Even though the electromechanical relay has served well for many generations, the ever-increasing
sophistication and complexity of modern processing equipment requires faster acting, more reliable
control functions than electromechanical relays and/or timing devices can offer.
ANS: T PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
2. PLCs are designed to be operated by plant engineers and maintenance personnel with limited
knowledge of computers.
ANS: T PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
3. A typical PLC can be divided into three components consisting of the processor unit, the power
supply, and the programming device.
ANS: F PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
4. The number of input and output modules necessary is dictated by the requirements of the equipment
that is to be controlled by a PLC.
ANS: T PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
5. Analog I/O devices are either ON or OFF, open or closed.
ANS: F PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
COMPLETION
1. The reluctance of the end user to learn a new language and the advent of the microprocessor gave the
industry what is now known as the ____________________.
ANS:
programmable logic controller (PLC)
programmable logic controller
PLC
PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
2. ____________________ is a high-level, real-world, graphic language that is understood by most
electricians and technicians.
ANS: RELAY LADDER LOGIC
1
,Test Bank For Technician's Guide to Programmable Controllers
Chapter 1—What is a Programmable Logic Controller (PLC)?
PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
3. The term ____________________ is used to distinguish actual devices that exist and must be
physically wired from the internal functions of the PLC system that duplicate the function of relays,
timers, counters, and so on, even though none physically exists.
ANS: real world
PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
4. The I/O section also converts varying voltage or current signals from analog input devices into
corresponding decimal values by way of a(n) ____________________.
ANS:
Analog-to-Digital converter (ADC)
Analog-to-Digital converter
ADC
PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
5. A(n) ____________________ is used to program most of the PLCs on the market today.
ANS:
personal computer (PC)
personal computer
PC
PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
SHORT ANSWER
1. What is a programmable logic controller?
ANS:
A programmable logic controller is a solid-state system designed to perform the logic functions
previously accomplished by components such as electromechanical relays, drum switches, mechanical
timers/counters, etc., for the control and operation of manufacturing process equipment and
machinery.
PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
2. Describe when an interface occurs.
ANS:
2
,Test Bank For Technician's Guide to Programmable Controllers
Chapter 1—What is a Programmable Logic Controller (PLC)?
An interface occurs when two systems come together and interact, or communicate. In the case of the
PLC, the communication or interaction is between the inputs (limit switches, push buttons, sensors,
and the like), outputs (coils, solenoids, lights, and so forth), and the processor. This interface happens
when any input or output voltage (AC or DC) or current signal is changed to or from a low-voltage DC
signal that the processor uses internally for the decision-making process.
PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
3. What does the step-down transformer do?
ANS:
The step-down transformer reduces the voltage level of the incoming AC power.
PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
4. What determines the size, or amerage rating of a power supply?
ANS:
The size or amperage rating of the power supply is based on the size, number, and type of I/O modules
that are to be used.
PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
5. List two terms that are used to describe an I/O device.
ANS:
When reference is made to an I/O device, the terms discrete input device, discrete output device,
analog input device, and analog output device are commonly used to describe the type of device.
PTS: 1 REF: What is a Programmable Logic Controller (PLC)?
3
, Test Bank For Technician's Guide to Programmable Controllers
Chapter 2—Understanding the Input/Output (I/O) Section
Chapter 2—Understanding the Input/Output (I/O) Section
TRUE/FALSE
1. The input/output section, or I/O section, is the major reason that PLCs are so versatile when used with
process machines or driven equipment.
ANS: T PTS: 1 REF: I/O Section
2. Discrete I/O modules are types of modules that only accept digital or ON- and OFF-type signals.
ANS: T PTS: 1 REF: Discrete I/O Modules
3. Status lights are provided for each output point to indicate when that point has been turned OFF.
ANS: F PTS: 1 REF: Output Fuses
4. The analog output module changes Binary or BCD values generated in the PLC logic into analog
signals using an RTD.
ANS: F PTS: 1 REF: Analog I/O Modules
5. While it is important that the controller and programming unit be installed or mounted in a control
center or other central location, the use of remote I/O racks allows the input and output modules to be
installed close to the actual operating equipment.
ANS: T PTS: 1 REF: Rack Installation
COMPLETION
1. PLCs with ____________________ I/O typically come in a complete unit that contains the processor,
I/O section, and power supply.
ANS: fixed
PTS: 1 REF: I/O Section
2. When an output module is connected positive and provides current to the outside world (output
device), the module is referred to as ____________________.
ANS: sourcing
PTS: 1 REF: Sourcing and Sinking
3. The ____________________ type output module is used when dry reed relays are desirable.
4
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