問題一覧
1
A roller bearing should normally be filled to what fraction of its space cavity?
1/3 to 1/2
2
After how many hours would you consider changing the turbocharger bearings, even though all appears to be normal?
12000 hours
3
Automatic control valves for steam service require periodic maintenance inspections because they.
continuously throttle steam resulting in wire drawing and erosion of the valve
4
In the case of a variable speed centrifugal pump?
capacity varies directly as the speed
5
The large number of mechanical and pulsating vibrations developed in a diesel engine may damage an attached?
gas driven turbocharger because it has a wide speed range and high temperature materials that are subject to resonant vibration
6
Which of the following statements concerning cylinder liner wear in a single acting diesel engine is correct?
Excessive liner wear causes wear between piston rings and grooves
7
Which ring dam arrangement should be used for centrifugal purification?
The largest inside diameter ring without loss of oil
8
Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?
volute
9
While at sea, during your watchin the engine room of a steam turpine amen vessel, you notice the main lube oil pump suction strainer vacuum differential has been increasing. To correct this you should
stop the main engine prior to removing the lube oil suction strainer covers, if simply changing over strainers has not proved satisfactory
10
Which of the following is true concerning the hose threads on compressed gas oxy-acetylene regulators and torches?
The torch oxygen inlet hose thread connection is "right" handed
11
To properly use a tube expander, the expander should be placed in the tube to be rolled so that the
rollers bear on the portion of the tube which is in the tube sheet
12
While your standing your engine room watch at sea, you notice the D.C. heater level dropping rapidly as indicated by the remote level indicator. Which of the following actions should be taken?
Open the make-up feed valve bypass and check the condenser level immediately
13
Which of the following is a structure built up around a mast from the deck to support the heel bearings of booms and to provide proper working clearances when a number of booms are installed on or around one mast?
boom table
14
Which is a departure of a plate, shape, or stanchion from its designed plane or axis when subjected to load?
buckling
15
What are pieces of timber of which a frame in a wood ship is composed called?
futtocks
16
Which of the following are strips of timber, metal, or boards fastened to frames, joists, etc., in order to bring their faces to the required shape or level, for attachment of sheathing, ceiling, flooring, etc.?
furrings
17
What are foundations of heavy blocks and timbers for supporting a vessel during the period of construction?
cribbing
18
Where the size and design of an engine is such that lubrication before starting is not necessary and an attached pump is normally used,
an independently driven stand-by pump is not required if a complete duplicate of the attached pump is carried as a spare
19
Where the size and design of an engine is such that lubrication before starting is not necessary and an attached pump is normally used,
an independently driven stand-by pump is not required if a complete duplicate of the attached pump is carried as a spare
20
Which can of lubricant is used reciprocating pump rods?
graphite and oil
21
Which of the following statements regarding low pressure, reciprocating, air compressor valves is correct?
Due to the physical construction of the valves, a relatively small cylinder clearance space is required for operation.
22
Which of the listed refractory materials will develop required strength only after being heated at a temperature of 1095C (2000F) or higher?
plastic fireclay
23
If an alternator is to be inactive for a considerable period of time, which of the following action should be taken?
The brushed should be lifted off the slip rings to prevent pitting of the metal by electrolytic action
24
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
variation in voltage to the coil
25
The relative permeability of a ferromagnetic material is
more than 100 or 1000
26
Permeability in a magnetic circuit corresponds to In an electric circuit.
conductivity
27
Which of the following deals with the construction of ships?
SOLAS convention
28
What is the total volume of all the enclosures inside the cargo holds measured after the construction of a ship?
net tonnage
29
What is the displacement of a vessel if it is floating on sea water exactly on her summer draft?
loaded displacement
30
What is the weight of the ships hull machineries spare parts and boiler water measured immediately after construction?
light displacement
31
What is termed as the total weight of the ships hull machineries spare parts boiler water fresh and ballast including the full weight that can be loaded?
dead weight ton
32
What is the volume of all enclosure of the cargo holds measured after the construction of the ship?
net ton
33
What do you call the weights of the hull machinery spare parts and boiler water of a vessel measured in the floating dock after its construction?
light displacement
34
In ship construction which strength members act to support the decks?
girders
35
What term indicates the rise of the deck in going from the side to the center of the vessel?
camber
36
The bottom of a ship in the midship region is usually flat but not necessarily horizontal. If the line of the bottom is extended out to intersect the moulded breath line the height of this intersection above the keel is called
deadrise
37
What term indicates the vertical distance between the bottom at the centerline and the bottom at any given point?
rise of bottom
38
Freeboard is the difference between the depth at side and the
draught
39
The point that is halfway between the forward and after perpendicular and is a reference point for vessel construction is the
amidship
40
Which of the following statements describes the correct procedure for closing a watertight door?
Loosely set up one dog on the opposite side from the hinges, snugly set up two dogs on the hinge side, then evenly set up all the remaining dogs.
41
The section aft of amidships is called after
body
42
What is known as the compartment that is forward of the stern generally below the load water line?
after peak
43
An open space to protect two bulkheads in case of fire or collision is called
cofferdam
44
In ship construction, structural hull members installed athwart ship are
deck beams
45
The average of the observed drafts is known as
mean draft
46
The center of buoyancy rotates around the metacenter on a radius called:
metacentric radius
47
The center of gravity of a freely swinging load suspended from a pedestal crane acts as if it were located at the ?
Longitudinal centerline
48
This is the curvature given to the decks in the longitudinal direction and is measured at a point by the difference between the height and the side at the side point and the high side amid-ship
sheer
49
What alloy is used as propeller material?
Manganese and Bronze
50
What kind of piping materials are used to produce piping in standard extra strong and double extra strong weights?
iron
51
Which of the following material below does a zinc anode protects?
cast iron
52
Which factor tends to increase scale formation on the salt-water side of the heat exchanger?
Prevents tip oxidation when heated
53
Line use to indicate symmetry about an axis and location of centers is called
center line
54
A line used mainly in sketching made of light line drawn with very little pressure on the pencil is called
construction line
55
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
56
What factors shorten the life of valve springs?
Fatigue and compression
57
The following are parts of the main bowl of purifier except.
bolt
58
To what temperature must a 1.00-L sample of neon at 0oF and 0.90 bar pressure be compressed to 0.25 L and 2.7 bar?
273 K
59
Which laying out tools is also called the metal worker's pencil?
scriber
60
Which type of maintenance consist of scheduled inspection and upkeep that is specifically intended to prevent faults from occurring during subsequent operational?
preventive
61
No-load on a transformer is carried out to determine
magnetising current and loss