Cocks and valves control or interrupt flow, and have internal passages arranged so that they can be restricted or closed: in cocks, by rotating the plug, and in valves, by lowering, raising or rotating a disc in relation to a seating surfaceAccording to the above sentence, which of the following statements is not true?
- A.Flows of fluids can be restricted by both cocks and valves
- B.There are seats in the internal passages of valves
- C.A disc of valve only moves up and down
- D.We can infer that there is a bore in cock ping
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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
-
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
-
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
-
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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