1、【
单选题
】
The ______engine is used for alternators and some times for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.
[1分]
、
four-stroke
、
two-stroke
、
slow speed
、
reversible
答案：
2、【
单选题
】
The discharge flow of a reciprocating pump is ______.
[1分]
、
steady
、
in pulsation
、
continuous
、
large
答案：
3、【
单选题
】
The cetane number of a diesel fuel oil indicates its ______.
[1分]
、
viscosity
、
acid content
、
heating value
、
ignition quality
答案：
4、【
单选题
】
Always ensure that the turning gear is______, even at the quay, the wave from other ships may turn the propeller and thus the engine.
[1分]
、
disengaged
、
engaged
、
assembled
、
disassembled
答案：
5、【
单选题
】
Camshafts are usually driven by timing gears or ______.
[1分]
、
push rods
、
chain drives
、
rocker arms
、
flywheels
答案：
6、【
单选题
】
The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices, during______.
[1分]
、
the upward stroke
、
the downward stroke
、
the power stroke
、
the suction stroke
答案：
7、【
单选题
】
The total starting air capacity required for reversible main engines is to be sufficient for a least ______.
[1分]
、
six consecutive(连续的) starts
、
eight consecutive starts
、
ten consecutive starts
、
twelve consecutive starts
答案：
8、【
单选题
】
A dirty diesel engine oil filter element can best be detected by ______.
[1分]
、
visual inspection of the elements
、
the pressure drop across the filter
、
high lube oil sump temperature
、
decrease in oil viscosity from the filter
答案：
9、【
单选题
】
Before a marine diesel engine is started the cylinders and pistons must be ______.
[1分]
、
cooled to appropriate temperature
、
warmed up gradually to appropriate temperature
、
opened up and renewed
、
ground and polished
答案：
10、【
单选题
】
A controllable pitch propeller on a diesel driven vessel eliminates the need for ______.
[1分]
、
friction clutches
、
disconnect clutches
、
reversing gears
、
reduction gears
答案：
11、【
单选题
】
The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ______.
[1分]
、
gas composition
、
gas temperature
、
pressure
、
timing
答案：
12、【
单选题
】
______continuously extract the crankcase atmosphere, via a pipe system, and move it past a sensitive and accurate opacity (不透明)measuring track.
[1分]
、
The oil mist detectors
、
The smoke detectors
、
An oily water monitor
、
Oil discharge monitoring and controlling system
答案：
13、【
单选题
】
The water in a steaming auxiliary boiler should be tested daily for ______.
[1分]
、
dissolved oxygen
、
chlorides
、
sludge
、
dissolved nitrogen
答案：
14、【
单选题
】
A firebox explosion in an automatically fired auxiliary boiler may be the result of ______.
[1分]
、
excessive purging before lighting off
、
insufficient trail for ignition period
、
a faulty transformer in the ignition circuit
、
insufficient purging after lighting off
答案：
15、【
单选题
】
A feed pump for an auxiliary boiler might lose suction if the ______.
[1分]
、
boiler water level is low
、
feed-water is too hot
、
boiler steam demand is low
、
feed-water is too cold
答案：
16、【
单选题
】
The gear and screw pumps are classified as______.
[1分]
、
variable stroke pumps
、
multistage pumps
、
positive displacement pumps
、
triple-ported pumps
答案：
17、【
单选题
】
The pressure of a liquid leaving the pump can be referred to as the ______.
[1分]
、
total head
、
discharge head
、
net positive suction head
、
suction head
答案：
18、【
单选题
】
Which of the valves listed will be cycled from fully open to fully closed when the handle is turned 90 degree?
[1分]
、
A rising stem gate valve
、
A globe stop valve
、
A check valve
、
A butterfly valve
答案：
19、【
单选题
】
A pump shaft that is bent or distorted should normally be ______.
[1分]
、
repaired by a suitable welding process
、
straightened by applying heat and torsion
、
reconditioned by metallizing and machining
、
replaced with a satisfactory spare
答案：
20、【
单选题
】
A centrifugal pump may fail to deliver water when first started if the ______.
[1分]
、
water seal pipe is plugged
、
pump is not primed
、
seal ring is improperly located
、
impeller is flooded
答案：
21、【
单选题
】
Which of the following conditions must exist for heat to flow from one object to another?
[1分]
、
The two objects must be in physical contact.
、
The two objects must be the same size.
、
There must be an existing temperature differential.
、
There must be an existing weight differential.
答案：
22、【
单选题
】
The dew point of air is reached when the wet bulb temperature is ______.
[1分]
、
twice the dry bulb temperature
、
10℃ above the dry bulb temperature
、
5℃ above the dry bulb temperature
、
equal to the dry bulb temperature
答案：
23、【
单选题
】
If air at 95 ℃ dry bulb temperature and 50% relative humidity is conditioned to 75 ℃ dry bulb temperature and 50% relative humidity, it is an example of ______.
[1分]
、
cooling only
、
cooling and humidifying
、
cooling and dehumidifying
、
adiabatic(绝热的) cooling
答案：
24、【
单选题
】
In order to achieve greater dehumidification(除湿) with an air conditioning system, you should ______. I. reduce the cooling coil temperature II. increase the re-heater temperature
[1分]
、
I only
、
II only
、
Both I and II
、
Neither I nor II
答案：
25、【
单选题
】
Oily water separators are used to ensure that ships don't discharge oil when pumping out ______.
[1分]
、
ballast water
、
boiler water
、
bilge water
、
sewage water
答案：
26、【
单选题
】
When started, a complete oily water separating unit is first filled______. The oily water mixture is then pumped through the inlet pipe into the coarse separating compartment.
[1分]
、
with dirty water
、
with clean water
、
by oily water
、
by mixed water
答案：
27、【
单选题
】
Which is the pollution prevention equipment?
[1分]
、
booster pump
、
evaporator
、
incinerator
、
cooler
答案：
28、【
单选题
】
The oil sludge is burnt in the ______onboard. I’ll show you the ashes.
[1分]
、
boiler
、
main engine
、
auxiliary engine
、
incinerator
答案：
29、【
单选题
】
Most marine biological sewage treatment plants consist of all the following statements except ______.
[1分]
、
aeration tanks
、
settling tanks
、
disinfection agent
、
anaerobic bacteria (厌氧菌)
答案：
30、【
单选题
】
Great care is dedicated to the removal of _____ from the scavenge air.
[1分]
、
gravity
、
viscosity
、
density
、
humidity
答案：
31、【
单选题
】
Dirty oil must be _____ before being used again.
[1分]
、
mixed with clean oil
、
purified
、
heated
、
strained
答案：
32、【
单选题
】
When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and ___ the sea water passing through the tubes.
[1分]
、
dispose
、
dissolve
、
heat
、
dissipates
答案：
33、【
单选题
】
When securing a flash-type evaporator for an extended period of time, you should ______.
[1分]
、
fill the unit with saltwater
、
fill the unit with descaling compound
、
completely drain the unit
、
tightly seal the unit to exclude air
答案：
34、【
单选题
】
Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?
[1分]
、
hydraulic pumps
、
valves
、
hydraulic cylinders
、
hydraulic motors
答案：
35、【
单选题
】
Positive displacement, helical gear(斜齿轮) pumps are well suited for pumping oil because ______.
[1分]
、
stuffing boxes eliminate the leakage problems usually associated with other gear pumps
、
it is not necessary to closely maintain design clearances with this pump
、
they are essentially self-priming and produce a high suction lift
、
these pumps are designed with extreme tooth angles
答案：
36、【
单选题
】
The oil in a cargo winch gear box should be sampled periodically(周期性地) to ______.
[1分]
、
prevent the gear box from leaking
、
prevent the oil from becoming inflammable(易燃的)
、
make sure it has not become contaminated(污染)
、
make sure the motor bearings are lubricated
答案：
37、【
单选题
】
If an anchor windlass has been idle for some time, you should ______.
[1分]
、
repack all valve stems
、
lubricate it prior to use
、
replace the foundation bolts
、
balance the warping heads
答案：
38、【
单选题
】
A mooring winch should be equipped with mechanical brakes capable of holding ______.
[1分]
、
half the breaking strength of the mooring line
、
the full breaking strength of the mooring line
、
the maximum expected tension(张力) of the mooring line
、
50% over the working tension of the mooring line
答案：
39、【
单选题
】
Hydraulic cranes must be properly warmed-up before being operated because ______.
[1分]
、
warm-up allows the hydraulic system to become charged with oil
、
warm-up allows the relief valves to be properly tested
、
hydraulic strainers operate only during the warm-up period
、
hydraulic fluid must be at the proper viscosity
答案：
40、【
单选题
】
The current flowing first in one direction and then in another is called ____ current.
[1分]
、
a rush
、
an alternating
、
a direct
、
an exciting
答案：
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