Question 31
In a control circuit, a normally closed stop pushbutton is wired in series with the starter coil. Why is it wired this way?
Question 32
In a simple series circuit, if one lamp burns out and goes open circuit, what happens to the other lamps in that same series circuit?
Question 33
In a basic Ohm’s law relationship, what happens to the current if the voltage across a fixed resistance is doubled?
Question 34
You need to verify the running current of a motor without disconnecting any conductors. Which instrument is best suited for this task?
Question 35
A lighting circuit supplies four identical 60 W lamps at 120 V connected in parallel. What is the total current drawn by the circuit?
Question 36
In a simple series circuit, if one lamp burns out, what happens to the other lamps in the same series circuit?
Question 37
Two 60 W, 120 V lamps are connected in parallel on a 120 V circuit. What is the total power drawn by the two lamps?
Question 38
In basic series circuits, how is the current through each resistor related?
Question 39
In a simple series circuit, how is the current related in each component?
Question 40
What electrical quantity is measured by an ohmmeter function on a multimeter?
Question 41
Two 12 ohm resistors are connected in parallel across a supply. What is the equivalent resistance of the combination?
Question 42
Two lamps are connected so that if one lamp burns out, the other goes out as well. How are the lamps connected?
Question 43
In a simple series circuit, if one lamp burns out (open circuit), what happens to the other lamps?
Question 44
In a large panelboard, you notice that several single-pole breakers serving nonlinear electronic loads are connected to a shared neutral. The neutral conductor shows signs of overheating, but the phase conductors appear within their ampacity. What is the most likely cause?
Question 45
In a simple series circuit, what happens to the total resistance when another resistor is added in series?
Question 46
A lighting circuit has three luminaires connected in parallel to a 120 V supply. If one lamp fails open-circuit, what happens to the other two?
Question 47
A three-phase, 600 V motor is connected in a wye configuration. If phase-to-phase voltage is 600 V, what is the approximate phase-to-neutral voltage?
Question 48
Which unit is used to measure electrical current in a circuit?
Question 49
In a parallel circuit, how does the total resistance compare to the resistance of the individual branches?
Question 50
During commissioning, a journeyperson measures line-to-line voltages of 600 V, 605 V, and 590 V on a three-phase system. What is the best interpretation?
Question 51
Which of the following best describes a series circuit?
Question 52
Which meter setting is appropriate when checking the voltage between two phases on a 120/208 V panelboard?
Question 53
What is the nominal single-phase supply voltage for most Canadian dwelling unit receptacle circuits?
Question 54
In a simple series circuit, how is current distributed through the components?
Question 55
In a simple series circuit, what happens to the current if one of the loads becomes open-circuited?
Question 56
In a 120/240 V single-phase, three-wire residential service, how many ungrounded (hot) conductors are there?
Question 57
Two 60 W, 120 V lamps are connected in parallel on a 120 V circuit. If both are operating, what is the total power consumed?
Question 58
Two lamps are connected in series on a 120 V circuit. If one lamp burns out and opens, what happens to the other lamp?
Question 59
In a simple parallel circuit, how does the voltage across each branch compare to the source voltage?
Question 60
Three resistors of 12 Ω, 12 Ω, and 12 Ω are connected in series. What is the total resistance?