Engineering · Electrical — Ground Detection
On an ungrounded (insulated) ship's distribution system, a single ground fault on one phase:
- AImmediately trips the main breaker
- BCauses the generator to overspeed
- CDoes not by itself cause a fault current, but a second ground on another phase would create a short circuit✓ Correct
- DHas no effect that can be detected
Explanation
Marine systems are commonly ungrounded so a single ground does not interrupt power (improving continuity of supply). Ground-detection lamps/meters reveal it so it can be cleared before a second ground on another phase causes a short circuit.
Authority: Modern Marine Engineer's Manual; shipboard distribution
Practice the full Engineering bank
Free spaced-repetition quizzing across 2190 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Engineering questions
- Diesel — Operating Cycle
In a four-stroke-cycle diesel engine, the events occur in which order?
- Diesel — Operating Cycle
Compared with a four-stroke engine of the same speed and cylinder size, a two-stroke-cycle diesel produces a power stroke:
- Diesel — Air Systems
The primary purpose of scavenging in a two-stroke diesel engine is to:
- Diesel — Air Systems
A turbocharger increases engine power output mainly by:
- Diesel — Combustion
Ignition of the fuel in a diesel engine is initiated by:
- Diesel — Fuel
The cetane number of a diesel fuel is a measure of its: