Question 1
What is the typical purpose of a disconnect switch installed adjacent to a rooftop HVAC unit?
Question 2
A motor nameplate shows full-load current (FLA) of 12 A and locked-rotor current (LRA) of 60 A. What does this indicate?
Question 3
In a PLC system, what does the acronym I/O stand for?
Question 4
What is the primary reason for using a 'pilot duty' rating on a control relay?
Question 5
What does the marking 'NC' on a contact block indicate?
Question 6
Which PLC instruction is used to energize an output only when a logic condition transitions from false to true?
Question 7
Which PLC instruction checks if a bit is '1' (ON)?
Question 8
What is the primary reason for using a 'pilot duty' rating on a relay?
Question 9
Which PLC instruction is used to energize an output for one scan only on a rising edge?
Question 10
A journeyperson is troubleshooting intermittent operation of a photoelectric lighting control used for outdoor lighting. The lights sometimes stay on during bright conditions. What is the most likely cause?
Question 11
When interpreting a floor plan, what does a dashed line between switches and fixtures typically represent?
Question 12
On an industrial print, a dashed line connecting several control devices usually indicates what?
Question 13
In a 4-20mA control loop, what value typically represents 50% of the process variable?
Question 14
Identify the logic gate that outputs HIGH only if one input is HIGH and the other is LOW (Exclusive OR).
Question 15
In a PLC system, which module directly controls the voltage sent to the field devices (solenoids, lamps)?