A number of biological sewage treatment plants are in use at sea but nearly all work on what is called the extended aeration processBasically the consists of oxygenating the liquor by bubbling air through itAccording to the above two sentences, the word "this" means _____.
- A.a sewage treatment plant
- B.the extended aeration process
- C.the liquor
- D.the bubbling air
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Worn main bearings in a diesel engine can result in ______________.
- A.decreased compression pressure
- B.increased lube oil pressure
- C.lower lube oil temperature
- D.excessive leakage past the piston rings
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In motor ship, _____ is often used to recover some of the heat carried in the exhaust gases from the main engine.
- A.an diesel oil heater
- B.a waste heat boiler
- C.a fresh water generator
- D.all the above
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An indication of a diesel engine air intake being partially clogged, is _____.
- A.low firing pressure and low exhaust temperatures
- B.low firing pressure and normal exhaust temperatures
- C.high firing pressure and low exhaust temperatures
- D.high firing pressure and high exhaust temperatures
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Which of the following marine examples belongs to the open loop control system?
- A.Accommodation heating system
- B.Steering gear
- C.Boiler control
- D.Cargo control
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Large crosshead type engine generally has two lubrication systems, a function performed only by crankcase oil system is .
- A.lubricating
- B.cooling
- C.cleaning
- D.neutralizing
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A centrifugal fuel oil purifier should be shut down if ________.
- A.more sealing water is needed
- B.the cover clamp needs tightening
- C.the purifier has a bad vibration when started
- D.water is discharged from the overflow line
-
The following preparations are essential for any ______ of marine diesel engine before it may be started.
- A.doing
- B.make
- C.turn
- D.operating
-
The scale trap is located between the .
- A.king valve and the expansion valve
- B.solenoid valve and expansion valve
- C.evaporator and receiver
- D.compressor and evaporator
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Exhaust pyrometer readings provide an indication of the .
- A.effectiveness of water-cooled exhaust elbows
- B.distribution of the load between engine cylinders
- C.amount of fuel penetration into the engine cylinders
- D.indicated horsepower of the engine cylinders
-
In a medium speed diesel engine, a trunk type piston may be cooled by_______Ioil circulation though passages in the piston crown IIheat transfer through piston rings and liner wall
- A.I only
- B.II only
- C.either I or II
- D.neither I or II
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