MINNESOTA POWER LIMITED
TECHNICIAN EXAM PRACTICE
EXAM 2026 -2027| 100 ORIGINAL
QUESTIONS & ANSWERS from
ACTUAL PAST PAPERS | DETAILED
RATIONALES | COMPLETE EXAM
PREP GRADED A+
1. A Class 2 power supply is marked with a maximum output of 100 VA. A technician connects
a 24 V load that requires 3.5 A at full operation. What is the most appropriate conclusion?
A. The load is within the supply rating because 24 V × 3.5 A is 84 VA
B. The load exceeds the supply because Class 2 supplies cannot exceed 60 VA
C. The load exceeds the supply because the current is greater than 2 A
D. The load is acceptable only if the circuit is grounded
Answer: A. 84 VA
Power is calculated as P = V × I. Therefore, 24 V × 3.5 A = 84 VA, which is below the 100 VA
rating.
2. A technician measures 24 V at the power supply but only 17 V at the far end of a low-
voltage circuit under load. The cable is significantly longer than the original design.
Which condition is the most likely cause?
A. Excessive conductor resistance and voltage drop
B. Excessive circuit frequency
C. Excessive grounding electrode resistance
D. Reverse polarity at the power supply
Answer: A. Excessive conductor resistance and voltage drop
Longer conductors have greater resistance. Under load, the resulting voltage drop can cause
substantially lower voltage at the receiving device.
3. A 24 VDC circuit has a total resistance of 12 Ω. What current should the technician
expect?
,A. 0.5 A
B. 2 A
C. 12 A
D. 288 A
Answer: A. 0.5 A
Ohm's law gives I = V/R = 24/12 = 2 A. Therefore, the correct answer is actually B. 2 A.
4. A technician is troubleshooting a communication circuit. The power supply voltage is
correct, but the receiving device repeatedly loses communication whenever a nearby
motor starts. Which problem should be investigated first?
A. Electromagnetic interference
B. Excessive conductor color variation
C. Grounding electrode length
D. Excessive enclosure size
Answer: A. Electromagnetic interference
Motors and other inductive equipment can generate electromagnetic interference that can disrupt
sensitive communication and signaling circuits.
5. Two resistors of 100 Ω and 200 Ω are connected in series across a 30 V source. What is
the circuit current?
A. 0.10 A
B. 0.15 A
C. 0.20 A
D. 0.30 A
Answer: A. 0.10 A
The total resistance is 100 + 200 = 300 Ω. Using I = V/R, the current is 30/300 = 0.10 A.
6. A technician needs to determine whether a power-limited circuit has an open conductor.
Which test is most appropriate after safely de-energizing the circuit?
A. Continuity test
B. Frequency test
C. Capacitance test only
D. Power-factor test
Answer: A. Continuity test
, A continuity test can identify whether the conductor provides an electrically continuous path
between the selected points.
7. A 24 VDC circuit contains a 6 Ω load. What power is dissipated by the load?
A. 4 W
B. 24 W
C. 96 W
D. 144 W
Answer: C. 96 W
Using P = V²/R, P = 24²/6 = 576/6 = 96 W.
8. A technician replaces a power supply with another unit having the same voltage but a
substantially lower current rating. The connected load operates intermittently. What is the
most likely explanation?
A. The replacement supply may be overloaded
B. The replacement supply has too much voltage
C. The circuit has become a Class 1 circuit automatically
D. Lower current capacity always improves circuit performance
Answer: A. The replacement supply may be overloaded
The replacement supply must be capable of supplying the required load current. Insufficient
current capacity can cause voltage collapse, shutdown, or intermittent operation.
9. A technician is installing conductors in a raceway serving a power-limited system. Why
is conductor identification particularly important?
A. To ensure proper circuit identification and prevent improper connections
B. To increase the conductor's ampacity
C. To eliminate voltage drop
D. To increase the power supply's VA rating
Answer: A. To ensure proper circuit identification and prevent improper connections
Correct identification helps technicians distinguish circuits and maintain safe, code-compliant
installations.
10. A 12 V device draws 2 A continuously. How much power does it consume?
A. 6 W
B. 12 W
TECHNICIAN EXAM PRACTICE
EXAM 2026 -2027| 100 ORIGINAL
QUESTIONS & ANSWERS from
ACTUAL PAST PAPERS | DETAILED
RATIONALES | COMPLETE EXAM
PREP GRADED A+
1. A Class 2 power supply is marked with a maximum output of 100 VA. A technician connects
a 24 V load that requires 3.5 A at full operation. What is the most appropriate conclusion?
A. The load is within the supply rating because 24 V × 3.5 A is 84 VA
B. The load exceeds the supply because Class 2 supplies cannot exceed 60 VA
C. The load exceeds the supply because the current is greater than 2 A
D. The load is acceptable only if the circuit is grounded
Answer: A. 84 VA
Power is calculated as P = V × I. Therefore, 24 V × 3.5 A = 84 VA, which is below the 100 VA
rating.
2. A technician measures 24 V at the power supply but only 17 V at the far end of a low-
voltage circuit under load. The cable is significantly longer than the original design.
Which condition is the most likely cause?
A. Excessive conductor resistance and voltage drop
B. Excessive circuit frequency
C. Excessive grounding electrode resistance
D. Reverse polarity at the power supply
Answer: A. Excessive conductor resistance and voltage drop
Longer conductors have greater resistance. Under load, the resulting voltage drop can cause
substantially lower voltage at the receiving device.
3. A 24 VDC circuit has a total resistance of 12 Ω. What current should the technician
expect?
,A. 0.5 A
B. 2 A
C. 12 A
D. 288 A
Answer: A. 0.5 A
Ohm's law gives I = V/R = 24/12 = 2 A. Therefore, the correct answer is actually B. 2 A.
4. A technician is troubleshooting a communication circuit. The power supply voltage is
correct, but the receiving device repeatedly loses communication whenever a nearby
motor starts. Which problem should be investigated first?
A. Electromagnetic interference
B. Excessive conductor color variation
C. Grounding electrode length
D. Excessive enclosure size
Answer: A. Electromagnetic interference
Motors and other inductive equipment can generate electromagnetic interference that can disrupt
sensitive communication and signaling circuits.
5. Two resistors of 100 Ω and 200 Ω are connected in series across a 30 V source. What is
the circuit current?
A. 0.10 A
B. 0.15 A
C. 0.20 A
D. 0.30 A
Answer: A. 0.10 A
The total resistance is 100 + 200 = 300 Ω. Using I = V/R, the current is 30/300 = 0.10 A.
6. A technician needs to determine whether a power-limited circuit has an open conductor.
Which test is most appropriate after safely de-energizing the circuit?
A. Continuity test
B. Frequency test
C. Capacitance test only
D. Power-factor test
Answer: A. Continuity test
, A continuity test can identify whether the conductor provides an electrically continuous path
between the selected points.
7. A 24 VDC circuit contains a 6 Ω load. What power is dissipated by the load?
A. 4 W
B. 24 W
C. 96 W
D. 144 W
Answer: C. 96 W
Using P = V²/R, P = 24²/6 = 576/6 = 96 W.
8. A technician replaces a power supply with another unit having the same voltage but a
substantially lower current rating. The connected load operates intermittently. What is the
most likely explanation?
A. The replacement supply may be overloaded
B. The replacement supply has too much voltage
C. The circuit has become a Class 1 circuit automatically
D. Lower current capacity always improves circuit performance
Answer: A. The replacement supply may be overloaded
The replacement supply must be capable of supplying the required load current. Insufficient
current capacity can cause voltage collapse, shutdown, or intermittent operation.
9. A technician is installing conductors in a raceway serving a power-limited system. Why
is conductor identification particularly important?
A. To ensure proper circuit identification and prevent improper connections
B. To increase the conductor's ampacity
C. To eliminate voltage drop
D. To increase the power supply's VA rating
Answer: A. To ensure proper circuit identification and prevent improper connections
Correct identification helps technicians distinguish circuits and maintain safe, code-compliant
installations.
10. A 12 V device draws 2 A continuously. How much power does it consume?
A. 6 W
B. 12 W
