HV Exit Exam • Set 3 Question 28 of 30
When two diesel generator sets are running smoothly in parallel on the main switchboard during an engine room watch, what does this condition fundamentally imply?
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Direct Answer
Option A: Both generators have identical terminal voltage, system frequency, and phase sequence
Parallel operation requires synchronization: identical terminal voltage, identical frequency, correct phase sequence, and identical phase angle at the moment of breaker closure.
All Options
A
Both generators have identical terminal voltage, system frequency, and phase sequence
(Correct Answer)
B
Both diesels carry identical active kW, reactive kVAr, and line amperage at all times
C
Both diesels are operating at varying unsynchronized rotational speeds
D
Both generators are operating without voltage regulators
Detailed Explanation & Context
Parallel operation requires synchronization: identical terminal voltage, identical frequency, correct phase sequence, and identical phase angle at the moment of breaker closure.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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