ThatQuiz
|
Test Library
|
Take this test now
Ladder logic - Quiz
  • 1. Who established the analogy between logical propositions and relay contact status?
A) Claude Shannon
B) John von Neumann
C) Alan Turing
D) Nikola Tesla
  • 2. What is the primary function of a coil in ladder logic?
A) Checker
B) Actuator
C) Input module
D) Rung input
  • 3. How many times can a ladder program refer to the status of a single bit?
A) Only once
B) Twice
C) Any number of times
D) Zero times
  • 4. What does a slash within a checker or actuator indicate?
A) The coil is energized
B) The circuit is broken
C) The default state of the device at rest
D) An error in the logic
  • 5. What happens if a path exists from the left side of the rung to the output?
A) The memory bit clears
B) The rung is considered false
C) The PLC resets
D) The rung is considered true
  • 6. What is the typical position of a coil on a rung?
A) The center
B) The far right
C) The far left
D) Above the contacts
  • 7. In the relay analogy, what represents the output of a rung?
A) A coil
B) A pushbutton
C) A limit switch
D) A memory module
  • 8. What do physical contacts represent in ladder logic?
A) Hard outputs to actuators
B) Memory address allocation
C) Hard inputs from devices
D) System clock status
  • 9. What happens to the output coil if no path exists on the rung?
A) The coil remains at its last state
B) The coil is bypassed
C) The coil is de-energized
D) The coil is energized
  • 10. What does each coil or contact correspond to in the programmable controller?
A) The CPU temperature
B) The status of a single bit
C) A physical wire connection
D) The total rung count
  • 11. What can a coil represent besides a physical output?
A) A communication protocol
B) A power supply failure
C) A hardware interrupt
D) An internal storage bit
  • 12. What serves as a simple analogy for checkers?
A) A fuse
B) A push button input
C) A power source
D) A light bulb output
  • 13. Besides relay rack devices, what else was shown on early ladder diagrams?
A) Software subroutines
B) Memory storage addresses
C) External items like pumps and heaters
D) User interface graphics
  • 14. What is ladder logic used for today?
A) Writing web server scripts
B) Developing software for PLCs
C) Developing operating systems
D) Managing cloud infrastructure
  • 15. Where does the name 'ladder logic' come from?
A) The visual resemblance to a ladder with rails and rungs
B) The vertical growth of the software
C) The complex nature of electrical diagrams
D) The sequential nature of hardware relays
  • 16. Which standard defines other programming languages like Structured text alongside ladder logic?
A) ANSI C
B) ISO 9001
C) IEC 61131-3
D) IEEE 802.3
  • 17. Which programming language mentioned is similar to C?
A) Assembly
B) Ladder logic
C) Structured text
D) FORTRAN
  • 18. Why was ladder logic chosen for factory engineers and technicians?
A) It was the only language capable of high speeds
B) It was faster to compile than other languages
C) It required no training in general-purpose languages like FORTRAN
D) It was designed by computer scientists
  • 19. What is a 'rung' in ladder logic considered to be?
A) A rule
B) A data block
C) A subroutine
D) A variable
  • 20. How do relay-based systems execute rules compared to PLC-based systems?
A) In a random order
B) Sequentially in a loop
C) Only upon user request
D) Simultaneously and immediately
  • 21. What term describes how a PLC executes rules?
A) Trigger
B) Scan
C) Batch
D) Interrupt
  • 22. What often accompanies a ladder logic program in complex systems?
A) A hardware emulator
B) A compiler suite
C) A human–machine interface (HMI)
D) A web browser
  • 23. In a Logical AND circuit for a bank vault door, how many key switches must be closed to activate the motor?
A) Zero
B) Two
C) Three
D) One
  • 24. What type of contacts are used for the key switches in the Logical AND vault door example?
A) Latched
B) Momentary
C) Normally open
D) Normally closed
  • 25. What type of contact is the obstruction detector in the Logical AND with NOT circuit?
A) Normally open
B) Toggle
C) Normally closed
D) Timed
  • 26. What function does the Logical OR circuit represent in the provided text?
A) Door motor = Key switch 1 AND Key switch 2
B) Unlock = Interior unlock AND Exterior unlock
C) Unlock = Interior unlock OR Exterior unlock
D) Door motor = Close door AND NOT Obstruction
  • 27. Which component is always powered in the Logical OR car door lock example?
A) The unlock solenoid
B) The door motor
C) The remote receiver
D) The exterior switch
Created with That Quiz — the math test generation site with resources for other subject areas.