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Certified Power Systems Operator Practice Examination Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf
- What is the primary purpose of Automatic Generation Control (AGC)?
- To reduce transmission line impedance
- To maintain system frequency and interchange schedules
- To increase generator inertia
- To improve substation grounding
Rationale: AGC adjusts real power output to maintain frequency and
scheduled power interchange.
- What happens to system frequency if generation is greater than load?
- Frequency decreases
- Frequency increases 1 / 3
- Voltage collapses
- Transmission lines overload
Rationale: Excess generation causes frequency to rise above
nominal.
- Which relay is used primarily for detecting short-circuits by current
- Distance relay
- Overvoltage relay
- Overcurrent relay
- Differential relay
magnitude?
Rationale: Overcurrent relays operate when current exceeds a preset
threshold indicating faults.
- What device automatically disconnects equipment during unsafe
- Recloser
- Capacitor bank
- Protective relay
- Load tap changer
system conditions?
Rationale: Protective relays sense abnormal conditions and trip
breakers.
5. A decrease in system voltage typically indicates:
- Surplus reactive power
- Reactive power deficiency 2 / 3
- Excess real power
- Load shedding
Rationale: Low voltage often results from insufficient VAR support.
6. A generator's governor primarily controls:
- Voltage
- Real power output
- VAR compensation
- Breaker timing
Rationale: Governor adjusts turbine input to regulate real power and
frequency.
7. A transformer tap changer is used to regulate:
- Frequency
- Voltage
- Rotor angle stability
- Power factor
Rationale: Tap adjustments maintain customer voltage within limits.
- Which of the following carries both real and reactive power?
- Ground wire
- Transmission line
- Lightning arrester
- Surge capacitor
- / 3
Rationale: Transmission lines carry complex power to loads.
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