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PLC Midterm Test 1-5 Exam Questions and
Answers 100% Pass
What does the PLC power supply do? - ANS The power source converts the available power
to a low voltage DC power for the logic circuits of the processor and for the internal power
required for the I/O modules.
Analog I/O devices are either ON or OFF, open or closed - ANS False
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.
A typical PLC can be divided into three components consisting of the processor unit, the power
supply, and the programming device. - ANS False
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
____________________ is a high-level, real-world, graphic language that is understood by most
electricians and technicians. - ANS Relay ladder logic
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 PLC
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, ©FYNDLAY 2025 ALL RIGHTS RESERVED
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 devices than electromechanical relays, timing and/or counting
devices can offer. - ANS True
What is a PLC - ANS A PLC is a solid state system originally designed to perform logic
functions for the control and operation of manufacturing process equipment and machinery.
Describe when an interface occurs. - ANS An interface occurs when two systems come
together and communicate
PLCs are designed to be operated by plant engineers and maintenance personnel with limited
knowledge of computers. - ANS True
What determines the size, or power rating of a power supply? - ANS The number and type of
I/O modules that will be installed
A(n) ____________________ is used to program most of the PLCs on the market today -
ANS laptop
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 true
List two terms that are used to describe an I/O device - ANS Analog and discrete
Some older PLCs used the ____________________ numbering system for I/O addressing -
ANS Octal
Any number that uses an exponent of 0, such as 10E0, has a place value of 10. - ANS false 1
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PLC Midterm Test 1-5 Exam Questions and
Answers 100% Pass
What does the PLC power supply do? - ANS The power source converts the available power
to a low voltage DC power for the logic circuits of the processor and for the internal power
required for the I/O modules.
Analog I/O devices are either ON or OFF, open or closed - ANS False
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.
A typical PLC can be divided into three components consisting of the processor unit, the power
supply, and the programming device. - ANS False
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
____________________ is a high-level, real-world, graphic language that is understood by most
electricians and technicians. - ANS Relay ladder logic
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 PLC
©FYNDLAY 1
, ©FYNDLAY 2025 ALL RIGHTS RESERVED
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 devices than electromechanical relays, timing and/or counting
devices can offer. - ANS True
What is a PLC - ANS A PLC is a solid state system originally designed to perform logic
functions for the control and operation of manufacturing process equipment and machinery.
Describe when an interface occurs. - ANS An interface occurs when two systems come
together and communicate
PLCs are designed to be operated by plant engineers and maintenance personnel with limited
knowledge of computers. - ANS True
What determines the size, or power rating of a power supply? - ANS The number and type of
I/O modules that will be installed
A(n) ____________________ is used to program most of the PLCs on the market today -
ANS laptop
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 true
List two terms that are used to describe an I/O device - ANS Analog and discrete
Some older PLCs used the ____________________ numbering system for I/O addressing -
ANS Octal
Any number that uses an exponent of 0, such as 10E0, has a place value of 10. - ANS false 1
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