Texas Power Distribution Systems Technician
Certification Exam Prep | Questions And
Answers With Verified Rationales | 2026/27 Qs
& Ans | Digital Pdf Download
1. What is the primary function of a power distribution system?
A. Deliver electricity from transmission systems to end users
B. Generate electricity at power plants
C. Store electrical energy
D. Increase transmission voltage
Answer: A. Deliver electricity from transmission systems to end users
Rationale: Distribution systems step down and deliver usable electricity to
consumers.
2. What is the typical voltage range in primary distribution systems?
A. Medium voltage (e.g., 4 kV–35 kV)
B. Extra-high voltage only
C. 120/240V only
D. Battery voltage
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,Answer: A. Medium voltage (e.g., 4 kV–35 kV)
Rationale: Primary distribution operates at medium voltages before step-
down.
3. What device reduces distribution voltage for residential use?
A. Distribution transformer
B. Circuit breaker
C. Capacitor bank
D. Relay switch
Answer: A. Distribution transformer
Rationale: Transformers step voltage down for safe consumer use.
4. What is a secondary distribution system?
A. Low-voltage network delivering electricity to customers
B. High-voltage transmission network
C. Power generation system
D. Fuel distribution system
Answer: A. Low-voltage network delivering electricity to customers
Rationale: Secondary systems supply final usable voltage (e.g., 120/240V).
5. What is a radial distribution system?
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,A. A system where power flows in one direction from a source
B. A looped redundant system
C. A transmission grid
D. A backup generator system
Answer: A. A system where power flows in one direction from a source
Rationale: Radial systems are simple but less reliable than loop systems.
6. What is a loop (ring) distribution system?
A. A system where power can flow from multiple directions
B. A single feeder system
C. A generator system
D. A transmission-only system
Answer: A. A system where power can flow from multiple directions
Rationale: Loop systems improve reliability and fault tolerance.
7. What is a feeder line?
A. Primary conductor supplying power from substation to distribution area
B. Generator output line
C. Water pipeline
D. Communication cable only
Answer: A. Primary conductor supplying power from substation to
distribution area
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, Rationale: Feeders carry bulk distribution power.
8. What is a distribution substation?
A. Facility that steps transmission voltage down for distribution
B. Power plant
C. Residential transformer only
D. Metering station only
Answer: A. Facility that steps transmission voltage down for distribution
Rationale: Substations bridge transmission and distribution systems.
9. What is a fuse used for in distribution systems?
A. Protect circuits by melting during overcurrent
B. Increase voltage
C. Store energy
D. Stabilize frequency
Answer: A. Protect circuits by melting during overcurrent
Rationale: Fuses prevent equipment damage during faults.
10. What is a recloser?
A. Automatic switch that restores power after temporary faults
B. Manual breaker only
© 2026 Academics_Excellence
Certification Exam Prep | Questions And
Answers With Verified Rationales | 2026/27 Qs
& Ans | Digital Pdf Download
1. What is the primary function of a power distribution system?
A. Deliver electricity from transmission systems to end users
B. Generate electricity at power plants
C. Store electrical energy
D. Increase transmission voltage
Answer: A. Deliver electricity from transmission systems to end users
Rationale: Distribution systems step down and deliver usable electricity to
consumers.
2. What is the typical voltage range in primary distribution systems?
A. Medium voltage (e.g., 4 kV–35 kV)
B. Extra-high voltage only
C. 120/240V only
D. Battery voltage
© 2026 Academics_Excellence
,Answer: A. Medium voltage (e.g., 4 kV–35 kV)
Rationale: Primary distribution operates at medium voltages before step-
down.
3. What device reduces distribution voltage for residential use?
A. Distribution transformer
B. Circuit breaker
C. Capacitor bank
D. Relay switch
Answer: A. Distribution transformer
Rationale: Transformers step voltage down for safe consumer use.
4. What is a secondary distribution system?
A. Low-voltage network delivering electricity to customers
B. High-voltage transmission network
C. Power generation system
D. Fuel distribution system
Answer: A. Low-voltage network delivering electricity to customers
Rationale: Secondary systems supply final usable voltage (e.g., 120/240V).
5. What is a radial distribution system?
© 2026 Academics_Excellence
,A. A system where power flows in one direction from a source
B. A looped redundant system
C. A transmission grid
D. A backup generator system
Answer: A. A system where power flows in one direction from a source
Rationale: Radial systems are simple but less reliable than loop systems.
6. What is a loop (ring) distribution system?
A. A system where power can flow from multiple directions
B. A single feeder system
C. A generator system
D. A transmission-only system
Answer: A. A system where power can flow from multiple directions
Rationale: Loop systems improve reliability and fault tolerance.
7. What is a feeder line?
A. Primary conductor supplying power from substation to distribution area
B. Generator output line
C. Water pipeline
D. Communication cable only
Answer: A. Primary conductor supplying power from substation to
distribution area
© 2026 Academics_Excellence
, Rationale: Feeders carry bulk distribution power.
8. What is a distribution substation?
A. Facility that steps transmission voltage down for distribution
B. Power plant
C. Residential transformer only
D. Metering station only
Answer: A. Facility that steps transmission voltage down for distribution
Rationale: Substations bridge transmission and distribution systems.
9. What is a fuse used for in distribution systems?
A. Protect circuits by melting during overcurrent
B. Increase voltage
C. Store energy
D. Stabilize frequency
Answer: A. Protect circuits by melting during overcurrent
Rationale: Fuses prevent equipment damage during faults.
10. What is a recloser?
A. Automatic switch that restores power after temporary faults
B. Manual breaker only
© 2026 Academics_Excellence
