PLC Practice Final Questions With Complete Solutions
A counter ________ when the count goes down by 1.
a. reverses
b. increments
c. debases
d. decrements Correct Answers d. decrements
A network connects logic elements to perform a specific
function in a program. (T / F) Correct Answers TRUE
A programmed latching relay that is latched will become
unlatched if power is lost and then restored. (T / F) Correct
Answers FALSE
A(n) ________ occurs when the accumulated count exceeds the
upper limit.
a. system error
b. reset
c. overflow
d. increment Correct Answers c. overflow
An MCR can be used to control which of the following?
a. Selected circuit rungs (networks)
b. Entire circuits
c. Individual contacts within a rung (network)
d. Both a and b Correct Answers d. Both a and b
An object used to change the position of DIP switches should be
________.
a. soft
, b. magnetic
c. nonconductive
d. sterile Correct Answers c. nonconductive
As scan time increases, so does the accuracy of any programmed
timers. (T / F) Correct Answers TRUE
Based on the condition of the input device and the program
instruction shown, the logic of the contact is false. (T / F)
Correct Answers FALSE
Because programmed latch and unlatch instructions are
retentive, they are unaffected by the loss of power to the system.
(T / F) Correct Answers TRUE
Contacts wired in parallel have an OR relationship. (T / F)
Correct Answers TRUE
Contacts wired in series have an OR relationship. (T / F)
Correct Answers FALSE
Devices that are intended to perform a START function are
normally wired in series with each other. (T / F) Correct
Answers FALSE
Devices that are intended to perform a STOP function are
normally wired in parallel with each other. (T / F) Correct
Answers FALSE
File Number 4 in the PLC-5 structure holds what kind of data?
a. Ladder logic
A counter ________ when the count goes down by 1.
a. reverses
b. increments
c. debases
d. decrements Correct Answers d. decrements
A network connects logic elements to perform a specific
function in a program. (T / F) Correct Answers TRUE
A programmed latching relay that is latched will become
unlatched if power is lost and then restored. (T / F) Correct
Answers FALSE
A(n) ________ occurs when the accumulated count exceeds the
upper limit.
a. system error
b. reset
c. overflow
d. increment Correct Answers c. overflow
An MCR can be used to control which of the following?
a. Selected circuit rungs (networks)
b. Entire circuits
c. Individual contacts within a rung (network)
d. Both a and b Correct Answers d. Both a and b
An object used to change the position of DIP switches should be
________.
a. soft
, b. magnetic
c. nonconductive
d. sterile Correct Answers c. nonconductive
As scan time increases, so does the accuracy of any programmed
timers. (T / F) Correct Answers TRUE
Based on the condition of the input device and the program
instruction shown, the logic of the contact is false. (T / F)
Correct Answers FALSE
Because programmed latch and unlatch instructions are
retentive, they are unaffected by the loss of power to the system.
(T / F) Correct Answers TRUE
Contacts wired in parallel have an OR relationship. (T / F)
Correct Answers TRUE
Contacts wired in series have an OR relationship. (T / F)
Correct Answers FALSE
Devices that are intended to perform a START function are
normally wired in series with each other. (T / F) Correct
Answers FALSE
Devices that are intended to perform a STOP function are
normally wired in parallel with each other. (T / F) Correct
Answers FALSE
File Number 4 in the PLC-5 structure holds what kind of data?
a. Ladder logic
