問題一覧
1
20. The function of the spring used with channel or plate-type valves for reciprocating air compressors is to
•provide positive closing of the valves
2
133. What part of the boiler provides water circulation to the waterwall tubes?
•Downcomers
3
179. Boiler safety valves are set not to go above maximum operating pressure of higher than ?.
•0.1
4
12. What is the meaning of static suction head of a pump?
•distance the suction liquid level is below the center line of the pump.
5
84. In a fuel oil burner having a standard mechanical atomizer, the fuel and air are mixed as the fuel leaves the ?
•orifice
6
131. Inspection of a low pressure gear pump for cavitation will usually be indicated by a wear pattern ?
•along the inlet side of the housing
7
96. Which of the following is used as moisture arrester and dryer in the refrigeration system?
•Silica gel
8
83. You observedan efficiency drop caused by compressor fouling of the gasturbine, what is the most effective counter measure to carry out?
•Off-line washing
9
46. The heat gained per pound of refrigerant in the evaporator is known as they
•refrigerating effect
10
150. What type of pump is used in the steering gear of modern ship?
•Vane
11
140. Which of the following component is the primary shaft emerging out of the engine?lt directly receives the rotational motion from the crankshaft and rotates at the maximum velocity in high speed engines.
•thrust shaft
12
16. In a single-acting diesel engine. The cylinder liner area that is most difficult to lubricate is the ?
•minor thrust side
13
146. The possible cause why lube oil pumps fail to build up discharge pressure could be that the ?
•suction valve is closed
14
34. What is the purpose of maintaining an electrical lamp inside the boiler during a dry preservation method ?
•To accelerate the drying process
15
43. Having high exhaust temperatures would affect the ?
•efficiency of the engine
16
183. The range of values around a set point of a measured variable where "no action"occurs in an automatic flow controller is called:
•Deadband
17
174. What is the purpose of the dehydrator in refrigeration?
•Remove refrigerant moisture
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185. If you hear a crackling sound coming from a salt water centrifugal pump casing, the most probable cause of the noise would be ?
•excessive suction lift
19
88. Feedwater supplied to a flash type distilling plant will flash to vapor in the first-stage due to ?
•flash chamber pressure being lower than the saturation pressure corresponding to the feedwater temperature
20
33. 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
21
181. In a main propulsion turbine installation, the condensate pump initially discharges to the
•air ejector condenser
22
32. An axial pisto, variable stroke pump is used in a vessel's hydraulic steering gear. Under pressure, oil continually leaks out from between the valve plate/cylinder barreland will
•cause damage to the pump if not continually drained from the pump casing
23
138. During injection, the cam nose of the camshaft will push up the plunger of the pump, forcing the fuel to the ?
•fuel injector
24
73. What is the purpose of the boiler drum air cock?
•permit escape of air when steam is forming in the drum after lighting off
25
176. Movement of the pump control rack in a fuel injection system having individual plunger-type pumps
varies quantity of fuel
26
26. Which of the following will increase when fuel oils are heated ?
•volume
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147. Which of the following statement is correct relative to distillation plant operation?
•Distillation is the process of boiling seawater to produce vapor which is condensed into fresh Water
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70. The amount of supplied fuel oil on the boiler atomizer depends on the ?
•Fuel pressure
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38. Some engines are using auxiliary electrically driven blowers, which is continuosly running during maneuvering, and automatically cut-off, if the scavenge air pressure reaches_ load.
•50%
30
One of the major components of centrifugal pump is ?
•impeller
31
55. Why is the heating capacity of the fuel oil heater reduced when there is a build up of carbonization in the heater surfaces ?
•Because thermal conductivity of solidified contaminant is poor
32
194. Which of the following is the reason for installing settling tanks in the fuel oil system?
•To heat, allowing sediments and water to settle down
33
23. What part of a refrigeration system reduces the pressure of a liquid refrigerant?
•Expansion valve
34
94. A centrifugal pump may fail to deliver water when first started if the
•seal ring is improperly located
35
184. Passages are drilled at the diesel engine crankshaft in order to provide lubricating oil in the ?.
•piston rod bearings
36
36. The fundamental difference between a 2-stroke and a 4-stroke engine is in the number of ?
•piston strokes each one needs to complete a combustion cycle
37
149. Some engines are using auxiliary electrically driven blowers which is continuously running during maneuvering and automatically cut-off if the scavenge air pressure reaches load.
•50%
38
167. The bore of a diesel engine describes the ?
•AA diameter of the cylinder
39
143. If the boiler fires are extinguished by water contamination in the fuel oil, you should FIRST?
•secure the burner valves
40
68. What is the heat exchanger used to heat the boiler feed water by means of waste gas as it passes from the boiler to the stack?
•Economizer
41
126. Which of the following would result if the temperature of the fuel to the burners is too low?
•The boiler will produce heavy black smoke
42
15. Any unusual or new vibration in the hull or propeller shafting can be an indication of
•propeller imbalance
43
202. A twin-screw, rotary, positive displacement pump is provided with timing gears. If it were possible to change the lead (pitch) of the screws, which of the following statements would represent the true effect on the pump characteristics?
•The shorter the lead, the higher the pressure potential
44
145. In an engine operation what is the effect called that describes the unstable operation of the governor that will not maintain a steady state condition ?
•Hunting
45
41. Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by ?
•a liquid seal
46
49. What is the most effective method in removing water from diesel fuel oil ?
•By centrifuging the fuel
47
45. What needs to be done in order to maintain the gas turbine sustainable power output?
•Compressor washing,
48
89. Every automated machinery plant must have an engineers assistance alarm. Power for this alarm should be taken from the
•general alarm power supply
49
142. How does a quick closing valve operate?
•the valve bridge is collapse remotely allowing the valve to close
50
77. Increasing the valve clearance of a diesel engine intake valve will cause the valve to open ?
•later and have greater lift
51
107. Which combination of the main shaft segments listed below, that are located furthest from the main engine are connected by the inboard stern tube shaft coupling?
•Line shaft and stern tube shaft
52
79. What would be the result if the fuel used for boiler burners has sediments?
•Clogged atomizer tips
53
189. The purpose of the six-way valve used in an electro-hydraulic steering system is to,
•redirect hydraulic fluid flow when changing over pumps
54
120. Strainer is commonly used in hydraulic system in order to ?
•prevent solid particles from entering the pump.