問題一覧
1
A fixed displacement pump is a hydraulic pump in which the________.
discharge capacity is constant
2
The following are parts of the main bowl of purifier except___________.
bolt
3
In hydraulic system, all machines which are consumers of hydraulic power equipped with ________.
motor
4
Which of the following statements concerning braze welding is/are correct?
Braze welding is an exceptionally good method of repairing malleable (special heattreated) iron
5
Which of the following statements concerning braze welding is/are correct?
Braze welding is an acceptable method of repairing malleable iron and mild steel
6
If the intercooler relief valve lifts while an air compressor is operating under load, you should check for _____.
leaking high pressure discharge valves
7
Acetylene should never be used at pressures in excess of 15 psig because the _____.
slightest shock could cause an explosion
8
The tool used to makeup connection fittings for small diameter copper tubing is called a/an _____.
flaring tool
9
If a small auxiliary diesel engine will not crank but can be barred over, the trouble may be due to _________.
Corrosion of starting battery terminal connections
10
You should never watch the arc generated during electric arc welder with the naked eye because _____.
serious flash burns will result
11
When a waste heat boiler is installed in the exhaust gas bypass would be used _____.
at low loads to prevent corrosion in the boiler
12
An exhaust gas bypass is installed on a waste heat boiler in order to ______.
minimize moisture condensation in the boiler gas passages at low loads
13
Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?
faulty operation of a cylinder unloader
14
If the drive belts on an air compressor were squealing during start up, you should _____.
check the operation of the unloaders
15
Thermocouple pyrometers are sued on large, main propulsion diesel engines to indicate the temperature of the ______.
exhaust gases at various locations
16
Flux is used when soldering, in order to _____.
decrease the surface tension of the solder
17
A dirty intercooler inn the ship service air compressor will result in _____.
higher than normal power consumption
18
Protective equipment to be used while carrying out oxy‐acetylene welding should always include _____.
tinted goggles
19
Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an _________.
definer or viscous fluid damper
20
The leaking valves in a low pressure, reciprocating, air compressor can result from _____.
abrasion by dust and dirt
21
Black smoke exhausting from a diesel engine may be caused by ______.
a clogged air cleaner
22
Cylinder inlet valve failure in a low pressure air compressor can be caused by _____.
mechanical failure in the unloader
23
White smoke exhausting from a diesel engine can be caused by a _______.
cracked cylinder liner
24
Combustion knock occurring in a diesel engine can be caused by ______.
Low coolant temperature
25
If a diesel engine is smoking excessively under load, the cause could be ________.
plugged injector holes
26
Which of the following statements is correct concerning welding sequences?
First, weld the joints that will tend to contract the most.
27
In certain circumstances, weldments are preheated before each pass to _____.
reduce internal stresses
28
Excessive lube oil consumption by a reciprocating air compressor can be caused by _____.
carrying the oil level higher than normal
29
When welding or burning with an oxy‐acetylene torch, _____.
never allow more than 15 PSIG pressure in the acetylene hose
30
If an electric motor driven air compressor fails to start, it may be due to a _____.
tripped overload relay
31
The loss of a diesel engine cylinder air charge through leaky valves, pistons rings, worn or scored liners, would be indicated by which of the following sets of exhaust of conditions?
Low compression pressure and high exhaust temperature
32
4/3 Way valve is a type of directional valve with ___________
4 ports and 3 positions
33
A welding procedure used for joining dissimilar metals used in the construction of a MODU would be recorded in the
welding plan
34
Which of the following will speed up the recovery process when performing maintenance on a refrigeration system _______?
chilling the recovery vessel and heating the appliance
35
An aligning punch is used to_______________
line up corresponding holes in adjacent parts
36
What factors shorten the life of valve springs?
Fatigue and compression
37
Which of the fittings listed should be used for the installation of piping to permit removal of the pump for servicing?
Union
38
Expansion valve maintenance should include which of the following procedures?
Ensuring that the thermal bulb is in good contact with the suction line
39
A dial indicator is used to measure________.
shaft eccentricity
40
Important check to be done during overhauling of the pump is the______.
wear ring clearance against impeller
41
An oil film of a lubricant is affected by the______.
working temperature of the engine
42
Engine operating conditions may be indicated by the color of the exhaust smoke. Black smoke could indicate ________.
an overloaded engine
43
A reciprocating air compressor is running roughly and vibrating excessively, indicating that the _____.
foundation bolts are loose
44
When arc welding, the flux that covers the electrode is used to _____.
reduce oxidation
45
In order to minimize distortion in a weldment due to shrinkage, you should _____. I. use intermittent welds rather than continuous welds wherever possible II. make fewer passes with large electrodes as opposed to many passes with small electrodes III. use
I, II & III
46
A flare‐type tubing connector is used in the hydraulic hatch-cover system and has developed a slight leak. To stop the leak you should __________.
shut down the power unit and use two wrenches to avoid damaging the tubing when tightening
47
If the electric motor driving an air compressor fails to start, the cause may be a _____.
tripped circuit breaker
48
The nut of the bowl assembly is confirmed tight___________.
when marks on the body and nut are aligned
49
The size of flexible hose used in a hydraulic system is indicated by______________.
the numerical designation found on the 'skin' of the hose
50
Good maintenance is decisive and best be achieved in the engine room if there is________________.
high degree of safety