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問題一覧
1
Excessive lube oil consumption in a reciprocating air compressor is an indication of
worn or broken piston rings
2
The nut of the bowl assembly of a purifier is confirmed tight by means of ___
aligned marks on the body and nut
3
What lifting gear is used to remove the cylinder head of an diesel generator after disconnecting it from the engine?
chain block
4
A leakage first-stage unloader ina n air compressor will result in __
an abnormally low intercooler pressure
5
What could cause a flame failure in a boiler?
flame eye not properly aligned
6
If the flow of water from a centrifugal pump is allowed to be stopped by closing the discharge valve while the pump continues to run for an indefinite period, the __
liquid may overheat and vaporizew
7
When maneuvering, you discover heavy smoke coming from the turbocharger casing. You should
notify the bridge and ask to shut the engine down
8
What do you call the process of putting grinding compound between an exhaust valve and valve seat and rotating it in back and forth motion to restore a good fit on both the seat and the valve?
lapping
9
When a diesel engine emits blue exhaust smoke this is due to
excessive cylinder lubrication
10
A suitable location for the installation of an impulse type steam trap would be in the
horizontal run of drain line from the lowest point at the outlet of the heat exchanger
11
When there is enough supply of fue oil and engine failed to turn over after air starting valve has opened, what could be the cause?
insufficient air pressure in the tank
12
The noise created by condensate in steam lines when opening fuel oil storage tank heater is called ___
water hammer
13
What prevents the steam pressure from exceeding allowable working pressure
safety valve
14
What clearance is important in main condenser pumps to insure adequate discharge pressures?
impeller wearing ring and casing wearing ring
15
If the fuel oil temperature going to the burners is too low, the __
boiler will produce heavy black smoke
16
Before commencing work inside a bilge tank what test are you require to before entering
test the air inside the tank using gas analyzer
17
What is a lantern ring?
a part of the packing used to prevent air lackage on a centrifugal pump shaft
18
Is it advisable to clean and reuse paper LO cartridge filters?
No
19
Combustion gases can leak into the fire room through _
soot blower swivel tube packing glands
20
Which of the additives listed is used to reduce the foaming tendency of lube oil?
suppressants
21
Why is there a relief valve installed on the boiler burner fuel service system?
to protect the system from high discharge pressure
22
What type cooling medium is use on modern 4 stroke diesel generators to cool atomizer nozzles?
cooling water
23
A suspected leak in an operating fuel oil heating coil is normally confirmed by __
checking the drain inspection tank
24
A clogged fuel oil filter could result in:
any of the above
25
What corrective action is required when the boiler water test result show any hardness?
none
26
Air leaking in the flash type distilling plant could occur through __
all of the options
27
Malfunctioning of the feed pump to deliver feed water to an auxiliary boiler could be caused by __
grounded probes on the water level control
28
Boiler firesides must be kept free of soot accumulations because
soot insulates the boiler heating surfaces
29
To connect two lengths of pipe previously set in place, you should use a pipe
union
30
What is the common cause of lube oil purifier overflow?
all of these
31
Dark exhaust gas from the engine is caused by __
engine overload
32
Badly leaking refrigeration compressor discharge valves will cause
constant running of the compressor
33
Honing is a procedure done in an engine liner or cylinder bore to __
grind the surface with abrasive stone
34
A dirty intercooler on an air compressor will cause
increased motor current
35
If a centrifugal pump delivers insufficient discharge pressure due to worn wearing rings, what corrective actions is called for
replace the rings
36
If the foundation bolts of a reciprocating air compressor are loose, which of the conditions below will occur?
the compressor will vibrate
37
Which of the condensers listed is cooled by seawater?
main condenser
38
A leakage first-stage unloader ina n air compressor will result in __
all of the above
39
One cause of leaky valves in an air compressor may be
too much suction pressure
40
A diesel engine fails to start. What should not be the cause?
water leaking into cylinder
41
High salinity can be reduced and water chemistry controlled in a steaming boiler by adding caustic soda and phoshate and then
using continuous blowdown
42
The factors that determine the service life of packing in a pump will include which of the following conditions?
all of the above
43
The precautionary things to be done to avoid electric shock while working onboard are ____. I. Work on dry places. II. Use rubber gloves and shoes. III. Avoid working on hot places
I and II
44
A leakage or loss of pressure past the piston into the crankcase is __
blow-by
45
When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned
vented to the atmosphere
46
One cause of diesel engine surging can be a result of
njection pump fuel rack binding or sticking
47
The feed water in an auxiliary boiler should be chemically tested daily for alkalinity and
chloride
48
Why is there a relief valve installed on the boiler burner fuel service system?
to protect the system from high discharge pressure
49
If a refrigeration system is overchaged with refrigerant, one result will be __
water pressure will lower continually to shut off head
50
If a refrigeration system were short of refrigerant, the condition would result in __
continuous running of the compressor
51
What type of work permit is needed when working inside to clean the boiler tubes the boiler?
enclose space entry permit
52
Which of the following statement is true about Lubricating oil coolers?
the pressure of oil less than the cooling water
53
When there is crackling noise coming from a centrifugal pump housing this is an indication of __
excessive suction lift
54
Dark exhaust gas from the engine is caused by __
engine overload
55
Heavy soot accumulations in an auxiliary boiler could be caused by ___
improper burner maintenance
56
What is the small end bearing in 4 stroke diesel engines?
a bearing fitted on the connecting rod where the piston pin rotates
57
Very small irregularities on the seat and disk of a globe valve may be manually repaired with the valve in place by the process known
lapping