Q20 — 250 VDC System Loads
063 DC Dist-K2.01 (2.9)
Given:
Which ONE of the following completes the statements below concerning the Unit 1 250 VDC system?
The Unit 1 ___ is/are powered from the Unit 1 250 VDC Battery and Charger System.
Which ONE of the following completes the statements below concerning the Unit 1 250 VDC system?
The Unit 1 ___ is/are powered from the Unit 1 250 VDC Battery and Charger System.
A. Field Excitation Circuitry for the EDGs
B. Main Turbine Emergency Oil Pump
C. Vital Instrument Bus Inverters
D. Emergency Lighting Inverters
▶ Show Answer & Explanation
✓ B. Correct. The Unit 1 Main Turbine Emergency Oil Pump is powered from the Unit 1 250 VDC Battery and Charger System.
✗ A. All of the distractors are powered from the Unit 1 125 VDC Battery and Charger System. The candidate could incorrectly conclude that the Field Excitation Circuitry for the EDGs is powered from the 250 VDC system.
✗ C. All of the distractors are powered from the Unit 1 125 VDC Battery and Charger System. The candidate could incorrectly conclude that the Vital Instrument Bus Inverters are powered from the 250 VDC system.
✗ D. All of the distractors are powered from the Unit 1 125 VDC Battery and Charger System. The candidate could incorrectly conclude that the Emergency Lighting Inverters are powered from the 250 VDC system.
Ref: NOS05DCELEC-09 (DC Electrical Systems) | LO: NOS05DCELEC-09 — Identify and describe the local controls and indications associated with the DC Electrical System | Source: Modified Bank | Cognitive: Lower (Memory)
Connections
- Related systems: DC Power
- Related exam: 2018 NRC Written Exam