Facebook
Google
GitHub
LinkedinElectricity and Electronics
Troubleshooting Electrical Devices
10 questions
-
Question 1 of 10
A normally open (NO) pushbutton is connected to a control relay in a 24 volt DC circuit.
The circuit fault is a broken wire between the pushbutton and the relay coil. What voltages should be measured at each lettered point (with respect to ground)?
Reveal answerA = 24 V
B = 24 V
C (button unpressed) = 0 V
C (button pressed) = 24 V
D = 0 V
E = 0 V
F = 0 V
-
Question 2 of 10
A normally open (NO) pushbutton is connected to a control relay in a 24 volt DC circuit.
The circuit fault is a broken DC power supply. What voltages should be measured at each lettered point (with respect to ground)?
Reveal answerA = 0 V
B = 0 V
C (button unpressed) = 0 V
C (button pressed) = 0 V
D = 0 V
E = 0 V
F = 0 V
-
Question 3 of 10
A normally open (NO) pushbutton is connected to a control relay in a 24 volt DC circuit.
The circuit fault is a broken spring return in the pushbutton - always closed. What voltages should be measured at each lettered point (with respect to ground)?
Reveal answerA = 24 V
B = 24 V
C (button unpressed) = 24 V
C (button pressed) = 24 V
D (button unpressed) = 24 VD (button pressed) = 24 V
E = 0 VF = 0 V
You should specify which two points are being measured. You can’t measure voltage of a single point.
On question 3 some voltage should be measured different from 0v.