TPC PLC TEST QUESTIONS & ANSWERS
What is the purpose of a rung comment? - Answer -Explain a program operation
According to the stack rule, what happens each time a load instruction is used? -
Answer -The logic is pushed down one level
When programming in ladder logic, tags are used to - Answer -identify a device
In Boolean programming, all logic is some combination of which operations? - Answer -
AND,NOT,OR
Although and output generally appears on only one rung of a ladder logic program, it
may be energized by several sets of conditions that appear as - Answer -branches
The temperature range a thermocouple can detect is determined by the - Answer -
combination of metals used
The number of TTL, output devices a TTL output module can drive is called - Answer -
fanout
If an I/O module supplies current, it is considered a(n) ______ module. - Answer -
sourcing
To be useful to a PLC, analog input signals must be _______ by an input module -
Answer -digitized
Which output device is sometimes used as a repeater, using a signal to control several
different loads? - Answer -Relay
The easiest way to develop a PLC program is usually to divide the logic into different -
Answer -tasks
When sizing a programmable controller system, you must consider I/O, memory, and -
Answer -scan time
Which hardware documentation drawing identifies all system components and wiring
termination points? - Answer -Panel layout
Working with accurate, thorough specifications ensures that - Answer -all efforts move
toward a common target
A bill of material should include a complete list of part numbers, device numbers cross-
reference in the drawing, and part - Answer -manufacturers
, Adding I/O points in an existing rack is called - Answer -local expansion
The speed at which a LAN processes a piece of information is called - Answer -baud
rate
If a local I/O rack cannot accommodate additional I/O modules, you should - Answer -
create a remote I/O rack
Which type of data transmission uses a single frequency? - Answer -baseband
Which network control structure makes it possible for processors to communicate? -
Answer -Protocol
Which mathematical operation is the same as the Boolean OR function? - Answer -
Addition
The Boolean NOT function acts as a(n) - Answer -inverter
In ladder logic, the output instruction that looks like a coil is called - Answer -output
energize
Which device creates a numerically coded binary signal to represent an output
condition? - Answer -Encoder
Which digit is the most significant in the number 2684? - Answer -2
Most hardware problems in a PLC system occur in the - Answer -I/O devices
Once you understand how a PLC system works, the next step in troubleshooting it is to
- Answer -gather information
Which documentation shows how all field devices are wired and connected to the
controller? - Answer -Schematic diagram
Which of the following is the most common cause of a program problem? - Answer -
Changes made to the original program
As a good general rule, you should replace the battery in a programmable controller -
Answer -annually
A programmable logic controller is a device that - Answer -responds to status changes
in a system
The two circuits in an electromagnetic relay are the control circuit and the _______
circuit. - Answer -power
What is the purpose of a rung comment? - Answer -Explain a program operation
According to the stack rule, what happens each time a load instruction is used? -
Answer -The logic is pushed down one level
When programming in ladder logic, tags are used to - Answer -identify a device
In Boolean programming, all logic is some combination of which operations? - Answer -
AND,NOT,OR
Although and output generally appears on only one rung of a ladder logic program, it
may be energized by several sets of conditions that appear as - Answer -branches
The temperature range a thermocouple can detect is determined by the - Answer -
combination of metals used
The number of TTL, output devices a TTL output module can drive is called - Answer -
fanout
If an I/O module supplies current, it is considered a(n) ______ module. - Answer -
sourcing
To be useful to a PLC, analog input signals must be _______ by an input module -
Answer -digitized
Which output device is sometimes used as a repeater, using a signal to control several
different loads? - Answer -Relay
The easiest way to develop a PLC program is usually to divide the logic into different -
Answer -tasks
When sizing a programmable controller system, you must consider I/O, memory, and -
Answer -scan time
Which hardware documentation drawing identifies all system components and wiring
termination points? - Answer -Panel layout
Working with accurate, thorough specifications ensures that - Answer -all efforts move
toward a common target
A bill of material should include a complete list of part numbers, device numbers cross-
reference in the drawing, and part - Answer -manufacturers
, Adding I/O points in an existing rack is called - Answer -local expansion
The speed at which a LAN processes a piece of information is called - Answer -baud
rate
If a local I/O rack cannot accommodate additional I/O modules, you should - Answer -
create a remote I/O rack
Which type of data transmission uses a single frequency? - Answer -baseband
Which network control structure makes it possible for processors to communicate? -
Answer -Protocol
Which mathematical operation is the same as the Boolean OR function? - Answer -
Addition
The Boolean NOT function acts as a(n) - Answer -inverter
In ladder logic, the output instruction that looks like a coil is called - Answer -output
energize
Which device creates a numerically coded binary signal to represent an output
condition? - Answer -Encoder
Which digit is the most significant in the number 2684? - Answer -2
Most hardware problems in a PLC system occur in the - Answer -I/O devices
Once you understand how a PLC system works, the next step in troubleshooting it is to
- Answer -gather information
Which documentation shows how all field devices are wired and connected to the
controller? - Answer -Schematic diagram
Which of the following is the most common cause of a program problem? - Answer -
Changes made to the original program
As a good general rule, you should replace the battery in a programmable controller -
Answer -annually
A programmable logic controller is a device that - Answer -responds to status changes
in a system
The two circuits in an electromagnetic relay are the control circuit and the _______
circuit. - Answer -power
