Engineering · Refrigeration — Faults
Frost forming on the suction line back to the compressor and a low suction pressure most likely indicates:
- AOvercharge of refrigerant
- BCondenser fouling
- CA starved/low refrigerant charge or restricted liquid flow (excessive superheat low / low load)✓ Correct
- DHigh head pressure from non-condensables
Explanation
A shortage of refrigerant or a restriction (clogged drier/expansion valve) starves the evaporator, dropping suction pressure. Conversely, frosting back to the compressor can also signal liquid floodback — readings are interpreted together with superheat and head pressure.
Authority: Modern Marine Engineer's Manual; refrigeration troubleshooting
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: