PROGRAMMABLE LOGIC CONTROLLERS 5TH
EDITION EXAM PREP QUESTIONS AND
ANSWERS 2026 STUDY GUIDE
◉ 2. The symbol shown in figure is a: Answer: B. Normally closed
switch held open
◉ 3. A normally open contact disconnects two conducting points upon
pressing the button. Answer: False
◉ 4. A normally closed switch moves away from the stationary contact
upon pressing the button. Answer: True
◉ 5. In a normally open high temp switch, when it is closed, the circuit
sends a signal that the temp is reached maximum limit. Answer: True
◉ 6. Following is the electrical sign of a ___ switch. Answer: B.
Normally closed switch
◉ 7. When no power is going, the function of a spring in the normally
open switch is to : Answer: A. Disengage two conducting points.
, ◉ 8. The 6-pin push button stainless steel switch's backside has 2 pins in
the middle they are: Answer: C. Both normally closed and held closed
◉ 9. The main reason to connect a normally open switch pin to an LED
light's positive terminal is to supply power when the button pressed.
Answer: True
◉ 10. The 6-pin push button stainless steel switch's backside has 2 pins
in the middle, if they are normally closed. Answer: False
◉ 11. There are huge differences between manual and automatic transfer
switches. Manual uses push and pull relay logic, and the automatic uses
plug and unplug methods. Answer: False
◉ 12. The selection of manual or automatic switch should be based on
all of the following except: Answer: D. None of the above
◉ 13. The ___ coil causes the relay's contacts to either close or open.
Answer: D. Magnetized or demagnetized
◉ 14. A(n) __ sensor uses visible, ultraviolet, infrared, or laser lights
and requires both an emitter to generate the light beam and a detector.
Answer: C. Optical
EDITION EXAM PREP QUESTIONS AND
ANSWERS 2026 STUDY GUIDE
◉ 2. The symbol shown in figure is a: Answer: B. Normally closed
switch held open
◉ 3. A normally open contact disconnects two conducting points upon
pressing the button. Answer: False
◉ 4. A normally closed switch moves away from the stationary contact
upon pressing the button. Answer: True
◉ 5. In a normally open high temp switch, when it is closed, the circuit
sends a signal that the temp is reached maximum limit. Answer: True
◉ 6. Following is the electrical sign of a ___ switch. Answer: B.
Normally closed switch
◉ 7. When no power is going, the function of a spring in the normally
open switch is to : Answer: A. Disengage two conducting points.
, ◉ 8. The 6-pin push button stainless steel switch's backside has 2 pins in
the middle they are: Answer: C. Both normally closed and held closed
◉ 9. The main reason to connect a normally open switch pin to an LED
light's positive terminal is to supply power when the button pressed.
Answer: True
◉ 10. The 6-pin push button stainless steel switch's backside has 2 pins
in the middle, if they are normally closed. Answer: False
◉ 11. There are huge differences between manual and automatic transfer
switches. Manual uses push and pull relay logic, and the automatic uses
plug and unplug methods. Answer: False
◉ 12. The selection of manual or automatic switch should be based on
all of the following except: Answer: D. None of the above
◉ 13. The ___ coil causes the relay's contacts to either close or open.
Answer: D. Magnetized or demagnetized
◉ 14. A(n) __ sensor uses visible, ultraviolet, infrared, or laser lights
and requires both an emitter to generate the light beam and a detector.
Answer: C. Optical
