_______control system is one in which the control action is independent of the output.
B.Negative feed back
The_______is a crystal which, under pressure, produces an electric current which varies with the pressure
D.piezoelectric pressure transducer
Modern handheld digital tachometers operated by counting light pulses returned to the unit by
A.the tach generator
B.either the coupling or shaft
C.a small bulb attached to the shaft
D.a piece of reflective tape
UMS stands for
A.ultra much space
B.universal medium system
C.unit machined space
D.unattended machinery space
'Stand by an engine' means
A.'prepare to stop the engine'
B.'assemble an engine on its bedplate'
C.'make an engine ready for starting'
D.'dismantle an engine'
At the beginning of the watch the current operational parameters and the condition of all machinery should be verified and also the log readings should correspond with those
A.noted by the bridge officer
B.told by last duty engineer
D.in the instruction manual
After the order '_______' is given, the air system is shut down, the turning gear put in.
A.Finished With Engine
B.Stop the Engine
Personnel who are moving or handling material aboard ship should NOT follow which of the listed practices?
A.Signaling that all personnel are clear before lifting or lowering material
B.Examining material for sharp edges or protruding points before handling
C.Closing, tagging or securing valves that permit entrance of steam, water, or air into a fitting or other equipment
D.Throwing materials from high places to the deck
The class of fire on which a blanketing effect is essential to extinguish the fire is
Fire dampers prevent the fire spreading through the process of
When a nominated surveyor or recognized organization determines that the condition of the ship or its equipment does not correspond substantially with the particulars of the Certificate (IOPP) or is such that the ship is not fit to proceed to sea without presenting an unreasonable threat of harm to the marine environment, such surveyor or organization shall immediately ensure that corrective action is taken and shall in due course notify the Administration. If such corrective action is not taken, the Certificate shall be withdrawn and the Administration shall be notified immediately; and if the ship is in a port of another Party, the appropriate authorities of the port State shall also be notified immediately. When an officer of the Administration, a nominated surveyor or a recognized organization has notified the appropriate authorities of the port State, the Government of the port State concerned shall give such officer, surveyor or organization any necessary assistance to carry out their obligations under this regulation. When applicable, the Government of the port State concerned shall take such steps as will ensure that the ship shall not sail until it can proceed to sea or leave the port for the purpose of proceeding to the nearest appropriate repair yard available without presenting an unreasonable threat of harm to the marine environment.
Whenever an accident occurs to a ship or a defect is discovered which substantially affects the integrity of the ship or the efficiency or completeness of its equipment covered by this Annex the master or owner of the ship shall report at the earliest opportunity to the Administration, the recognized organization or the nominated surveyor responsible for issuing the relevant Certificate, who shall cause investigations to be initiated to determine whether a survey as required by paragraph 1 of this regulation is necessary. If the ship is in a port of another Party, the master or owner shall also report immediately to the appropriate authorities of the port State and the nominated surveyor or recognized organization shall ascertain that such report has been made.
When a ship is found not fit to proceed to sea by a nominated surveyor, then corrective action should be taken and be informed immediately. (1)the master (2)the authorities of port State (3)the Administration
When a ship were found its equipment does not correspond substantially with the particulars of the Certificate by a nominated surveyor and corrective actions unable to be taken, then
A.the Certificate would be withdrawn
B.the ship owner would be fined
C.the shipping company must be notified immediately
D.the ship must proceed to the nearest appropriate repair yard for a repair without delay
When a ship were found its equipment does not correspond substantially with the particulars of the Certificate in another Party and corrective actions unable to be taken, then all the following should be taken except
A.the Certificate would be withdrawn
B.the Administration should be notified immediately
C.the appropriate authorities of the port should be notified immediately
D.the ship should proceed to the nearest appropriate repair yard without delay
In the Second paragraph, the underline word 'Who', in such a context, stands for_____.
A.the master or owner of the ship
C.the Administration, the recognized organization or the nominated surveyor responsible forissuing the relevant Certificate
D.the appropriate authorities of the port State
Under normal operation, some lubrication oil mist may be discharged from the air compressor to the air start system. This oil may be from excess compressor cylinder lubrication, from faulty oil scraper rings, or may even be suspended oil vapor contaminating the engine room atmosphere and drawn in at the compressor suction. Oil discharge is kept to a minimum by draining the after cooler, air receiver and starting system. If small quantities of lubrication oil do get passed into the starting air system, they will deposit as thin moist film over internal pipe surfaces but are not readily combustible. If a cylinder non-return valve leak while the engine is in operation, some hot gas, possibly with unburned fuel and cylinder lubrication oil, may be blown through the valve to the adjacent air manifold. With further heating from the leaky valve, this, together with the already deposited oil film, will carbonize and form. incandescent carbon. If starting air is applied to the system while still hot, the high pressure air coming into contact with the burning carbon may cause an explosion. Such an explosion will cause a flame to pass back through the air start pipe system, evaporating the deposited oil film and igniting it in the presence of air. Very high velocities and shockwaves are generated which may rupture pipes and fittings.
Alternatively, if excessive oil has entered the air start system, a mixture of air and oil droplets may be discharged through the open cylinder non-return valve during starting. This spray may ignite due to high temperatures in the cylinder, causing a flame through the still open valve to the air manifold.
To prevent an explosion, air start valves must be correctly maintained and lubricated to ensure correct timing and free movement with positive closing. Oil in the system must be kept to a minimum, pipe lines must be drained and cleaned internally when necessary and oil discharge from air compressors must be kept to a minimum by good maintenance.
The passage is mainly about
B.scavenge box fire
C.starting air pipe
D.the danger of explosion in the starting air system
According to this passage, if the cylinder non-return valve were not leaky
A.an explosion would not be caused
B.there still would be a danger of explosion
C.oil would not deposit in the air pipe
D.pipe lines would not have to be drained
Which of the following is NOT mentioned in this passage?
A.There may be oil vapor in the engine room
B.Pipes and fittings may be damaged if explosion takes place
C.The cooler should be drained
D.Bursting caps must be fitted
The word 'spray' (underlined in the third paragraph) means
The sewage treatment system must be capable of discharging an effluent that comes within the limits of the tests. Sewage can be treated biologically so that it may be discharged with minimal damage to ecosystem. Biological treatment involves the use of living organisms to treat the sewage within the sewage treatment plant so the liquids and sludge discharged are within the standards specified.
Biological treatment plants are usually built up as a module and consist of various sections.
Waste matter collected from the ships sanitary appliances is led through a sanitary piping system to the treatment module. The solid matter is broken up by passing it through a screen or a series of revolving cutters. The broken up solid material, together with the waste liquid, passes into a tank containing bacteria which require oxygen and a nutrient to propagate. The nutrient is contained in the solid waste material, and oxygen is supplied by bubbling compressed air through the broken up waste. The propagated bacteria change the waste material into a sludge by aerobic digestion. The sludge is finally treated to kill the coliform. bacteria before it is passed overboard.
When a biological sewage plant is started up, such as when activating a new ship or after cleaning out the tank, a pellet containing bacteria is introduced into the tank. It takes approximately one week for the bacteria to propagate and make the system fully effective. The choice of sanitary appliance cleaners requires extreme care, as many cleaners are toxic to the active bacteria. Once a biological sewage plant is made active it should not be shut down. If it is it will have to be reactivated again because the bacteria will die without a supply of nutrients and oxygen.
Bacteria that require oxygen for their survival are referred to as aerobic. Aerobic bacteria are normally used in ships' sewage treatment equipment. Other forms of bacteria that do not require oxygen are referred to as anaerobic. Anaerobic bacteria are used in shore based sewage treatment works where methane is obtained as a by-product for use as fuel.
This passage is mainly about
A.sewage treatment methods
B.the various sections of a sewage treatment plants
C.biological sewage treatment system
D.how the sewage treatment plants are started up
Biological treatment may use __ to treat sewage (1)living organisms (2)chemicals (3)additives