問題一覧
1
Where engine bores exceed 230 mm, a bursting disc or flame arrester is to be fitted
at the supply inlet to the control air manifold for non- reversing engines
2
When a boiler flareback occurs, you should
Close the master fuel oil valve
3
The water cooling space on the turbocharger is damaged and you have no spares the cooling water must be closed what steps would you take to ensure least possible damage?
Remove rotor assembly and fit the sealing plate
4
The initial unloading (at start-up) of the device shown in the illustration is accomplished by
discharging the compressed air to the receiver with the minimum pressure valve closed
5
Ethylene oxide has a lower explosive limit of 2.0% and an upper explosive limit of 100% by volume in air. This means.
there is no possible ethylene oxide concentration in air which is too rich to burn
6
Which is an example of a secondary refrigerant?
brine
7
Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to ?
remove condensation and other liquids fron the cylinder
8
Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce
cold corrosion of the nozzles
9
Plugged spray holes in a diesel engine fuel injector will cause excessive smoking at idling speed in addition to
damage to pistons or cylinder heads
10
The time constant and R-C circuit may also be defined as the time during which the charging current falls to percent of its initial maximum value
37
11
Which of the listed conditions will occur if the discharge pressure of a rotary pump is increased from the designed 50 psi to 300 psi, while maintaining the same RPM?
the pump capacity will be decreased
12
Which of the following component is the primary shaft emerging out of the engine? It directly recieves the rotational motion from the crankshaft and rotates at the maximum velocity in high speed engines.
thrust shaft
13
The loss of a diesel engine cylinder air charge through leaky valves, piston ring, worn or scored liners, would be indicated by which of the following sets of exhaust of condition
low compression pressure and high exhaust temperature
14
During a routine round of a diesel engine generator, you observe a low oil level in the governor sump. If there is no visible sign of external leakage, you should suspect the cause to be a/an
leakage through the governor drive shaft oil seal
15
Which of the following is necessary for all waste heat boiler installations, regardless of design or manufacturer?
a means to control of evaporation
16
In a large slow-speed propulsion diesel engine, the force applied to the piston is
against the crosshead during the power and compression strokes
17
The minimum delivery pressure required for diesel engine fuel oil injection depends primarily on the
Firing pressure in the engine
18
What is mainly the reason why fuel injectors used in heavy fuel oil systems are provided with cooling?
To reduce carbon accumulation on the nozzles
19
The part of a diesel generator engine that must be checked first if heavy smoke is emitting from the funnel during its operation is the?
fuel oil valve
20
In which of the listed components of refrigeration system does a superheating of the refrigerant take place
evaporator
21
What part of big diesel engine is where burnt gases passes through before it reaches the funnel?
supercharger
22
The static suction lift of a pump is the difference in elevation between the
centreline of the pump and the when the source of liquid is below the pump
23
The initial unloading (at start-up) of the device shown in the illustration is accomplished by
discharging the compressed air to the receiver with the minimum pressure valve closed
24
When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used:
at low loads to prevent corrosion in the boiler
25
The ability of fuel particle to travel into the combustion chamber before burning
penetration
26
Which of the following changes in pump operating parameters will lead to pump cavitation in a centrifugal pump that is operating in an open system?
steadily increasing pump inlet temperature
27
The burner front refractory should be replaced when the slag accumulation causes?
the burner flame pattern to be distorted
28
Which of the following statememt is TRUE about an dielectric
a non-conductor of electricity
29
One advantage of a vacuum feed sight glass indicator used on cylinder lubricators over the discharge side liquid filled type sight glass is
there are fewer moving parts
30
If the fixed orifice in the evaporator steam supply line were to be removed, the steam pressure reducing valve located upstream would
be unable to maintain steam flow unless the proper range spring were to be installed
31
What is the curve representing vertical sections parallel to the central longitudinal vertical plane of the bow end of a ship
bow lines
32
If a centrifugal pump operating with a positive suction head vibrates, or becomes noisy, the cause could be
insufficient venting
33
Which of the following controls the amount of fuel atomize by a return flow oil burner
Fuel oil return valve
34
After the installation of new impeller wearing rings by pressing them onto the pump impeller hub, it is advisable to ?
check the shaft and impeller assembly on centers to see if the ring surfaces are true
35
Through which part of the air register assembly does the largest quantity of air passes through?
stationary air foil or bladed cone
36
Which of the items listed below is normally describe a ventilating fan
Axial flow
37
How is disolved oxygen in boiler feed water minimized?
maintain high feed water temperature
38
The purpose of expansion valve is to
provide an orifice between the high pressure and low pressure side of the system
39
What is known as an air motion induced in a four cycle diesel engine cylinder to improve air fuel mixing
turbulence
40
A capacitor consist of two
conductors separated by an insulator
41
feedwater supplied to a flash type distilling plant will flash to vaport in the first-stage due to ?
flash chamber pressure being lower than the saturation pressure corresponding to the feedwater temperature
42
The primary objective of the auxiliary exhaust system is to supply steam to?
dearating feed tank
43
Which of the following may cause overheating of the hydraulic pump?
excessive internal slippage in the pump
44
The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the
Expansion during the combustion process
45
The primary function of a fuel delivery check valve assembly is to
control fuel pressure delivered to the combustion chamber
46
Which of the following fitting has an anchored sleeve with a stuffing box and gland in which an extension of the joining pipe can slide freely within imposed limits?
tie rod expansion joint
47
How does a quick closing valve operate?
the valve bridge is collapse romotely allowing the valve to close
48
Rapid fluctuations of absolute pressure in the last effect of a multi effect submerged tube distilling plant will tend to cause
priming with increased salinity of distillate
49
The high pressure cut-out switch will stop the refrigeration compressor when there is?
a stoppage of condenser cooling water flow
50
Where engine bores exceed 230 mm, a bursting disc or flame arrester is to be fitted
at the supply inlet to the control air manifold for non- reversing engines
51
Which turbocharger component increases air density and helps improve engine operating efficiency
after cooler
52
When a vessel fitted with gland packing stern tube is underwaya small amount of water is allowed to leak through the stern stuffing box in order to.
binding of pump moving parts
53
The operation of a thermostatic steam trap depends upon the
Change in the amount of vapor produced within an enclosed chamber
54
An 8-inch (203 mm), globe-type, stop-check valve has been installed in the lube-oil cooler water outlet, with the flow coming in from the top of the disk. This means that
the valve will never permit water flow from the lube oil cooler
55
What is the simplest method used for determining if a centrifugal pump is operating as designed?
close off the discharge valve, and watch for a rise in pressure
56
The action should take when water is found in the fuel oil setting tank is to?
shift pump suction to an alternate settling tank
57
The initial unloading (at start-up) of the device shown in the illustration is accomplished by
discharging the compressed air to the receiver with the minimum pressure valve closed
58
Temperature measurement is an indication of the?
rate of heat transfer from one substance to another
59
Injection pressure in a common rail fuel system is controlled by
a bypass valve
60
Which of the following likely reason when the exhaust temperature is increasing in all cylinders of a normally-running main engine?
rising scavenging air temperature
61
If fuel injection in a diesel engine begins earlier than the design earlier than the design start of injection, ignition may be delayed because the
cylinder compression pressure may not be high enough
62
Which of the actions listed should be carried out immediately after securing the fires in one boiler of a two boiler ship?
relieve all fuel oil service pressure to that boiler
63
What is the reason why steam pressure reduces its pressure while accomplishing work in the engine or turbine?
the steam expands in volume
64
A close path made by several branches of the network is known as
loop
65
What is the means of removing the heat of condensation from the refrigerant in a normal refrigerating cycle?
Condensing the refrigerant in the system condenser
66
Which of the following conditions can cause oil to accumulate in the cooling system of a diesel engine
defective oil cooler core
67
Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer
the start of injection will be retarded
68
The purpose of the diffuser in a boiler burner assembly is to
allow some mixing of fuel and air
69
The property of a capacitor to store electricity is called its
capacitance
70
If the overflow tank high- level alarm sounds while the fuel oil tanks are being topped off, the engineer should
close the static leg filling valve
71
The correct radial clearances between the rotor and the casing in a propulsion turbine are maintained by the turbine
journal bearing
72
The type of pump that is usually used to transfer engine room bilges is the
reciprocating
73
Which is a spar, projecting forward over the bow for the purpose of holding the lower ends of the head sails
bow sprit
74
What is the meaning of static suction head of a pump?
distance of the suction liquid level above the center line of the pump
75
The part of a diesel generator engine that must be checked first if heavy smoke is emitting from the funnel during its operation is the?
fuel oil valve