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Онлайн-тестирование: Онлайн-тест CES 5.1 для Ch-Eng / 2nd-Eng
Онлайн-тест
Описание
Тест состоит из случайных вопросов по выбранной теме.
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Which one of the listed requirements regarding the stowage of liferafts corresponds to present SOLAS regulations?
Liferafts intended for throw-overboard launching shall be stowed midships secured to means for transfer to either side
Liferafts shall be stowed with its painter permanently attached to the ship
Liferafts shall be stowed to permit automatic release from their securing arrangements
Davit-launched liferafts shall be stowed on starboard side of the ship
A lifebuoy light is capable of working at minimum for a period of, and has a luminous intensity of:
4 h, 1 candela (about 1,0 mile range at normal meteorological sight)
2 h, 2 candelas (about 1,7 mile range at normal meteorological sight)
4 h, 2 candelas (about 1,7 mile range at normal meteorological sight
2 h, 1 candela (about 1,0 mile range at normal meteorological sight)
How do the extinguishing agents act?
by cooling, smothering, unfeeding (combustible suppression), inhibition
by ignifugation
by inhibition
by cooling, smothering, dilution with water and/or ventilation
According to their physical state, extinguishing agents may be classified:
Synthetic, proteinic, gases and liquid
Proteinic and synthetic
Solid, proteinic and gases
Solid, liquid and gases
On all UMS operated vessels and also on most other vessels the engine room is equipped with fire detectors. What requirements of testing and checking of the detectors are to be observed?
All the mentioned alternatives.
When testing detectors by suitable equipment (smoke and heat) check that the sensors self controlling system, e.g. a flashing control light etc. is functioning.
Check that the actual detector is giving appropriate signals to the central control unit and that all electric connections are in good order.
Check the detector with heat and/or smoke (in accordance with instructions in its manual)
Where shall manually operated call points be found?
So that no part of any corridor is more than 5m away from any manually operated call point
So that no part of any corridor is more than 20m away from any manually operated call point
there is no special rule for that
So that no part of any corridor is more than 10m away from any manually operated call point
Where may as a general rule pressure containers for gas fire-extinguishing medium be kept? (SOLAS II-2/5.1.10)
In cold storages
In the space which is to be protected
Above bulkhead deck
Outside the space which is to be protected
One of the risks of using CO2 is the low temperatures that it reaches when it vaporises; this temperature is approximately
-0?C
-5?C
-79?C
-109?C
*In cargo ships of less than 1000 gross tonnage the number of fire hoses (not including any hose required in any engineroom or boiler room ) must be:
One for each 10 m length of the ship plus one spare
To the satisfaction of the administration
One for each 10 m length of the ship
Four plus one spare for each deck
Which of the following should NOT be used on an electrical fire?
Dry powder extinguisher.
CO2 extinguisher.
Halon extinguisher
Water extinguisher.
*The smoke detector (fire indicator) indicates a fire in a cargo hold loaded with general cargo; this is immediately followed by a heavy smell of fire. What action should be taken first?
Inspect the scene before deciding the method to be used for fire-fighting
Start the fire pumps, open the hatches and start fighting the fire with fire hoses
Use the ship's central gas-extinguishing system to put out the fire
Close the ventilation system and other openings to the hold in order to choke the fire
*The engine room is equipped with regular fire hoses and nozzles. What is important to observe when using water as an extinguishing agent in the engine room?
Water may short circuit electrical installation and may be a threat to the personnel operating the fire hose as well as to electrical equipment itself
All the mentioned alternatives
Water has a clear limitation in fighting an oil fire
To reduce the negative effect of water in an engine room, the spraying function to be used. The spray function will also give the personnel operating the fire hose good shelter against heat
Where shall shore side fire-fighting personnel find necessary information on the ship's fire control in an emergency situation? (SOLAS II-2/20.2)
The Captain of the ship is responsible for giving the necessary information of the ship's control plan
Copy of the fire control plans/folders to be stored in a watertight prominently marked container outside the deck house
Copy of fire control plans/folders to be posted in a prominently marked localisation on the navigating bridge
Information to be given by the ship's Owner through the nearest Rescue Coordination Centre
Regular ‘updating’ of a vessel’s position in an Inmarsat-C installation is among others things important:
To guarantee reception of NAVTEX-reports in areas where normal NAVTEX-facilities are not available
To guarantee reception of NAVTEX-reports
To guarantee assistance in emergency
To restrict NAVARAE-reports
If there is an accidental discharge of oil from a tanker, which of these items will NOT have to be noted in the Oil Record Book ?
The time the discharge occurred
The ship-s position when the discharge occurred
The approximate quantity and the type of oil
The name of the person responsible for the oil discharge
What is the function of an OSC (OPA-90)
Incident Commander
Officer of Spill Command
Spill management
On the Scene Co-ordinator
It is important that a compress is done correctly. One of the alternative signs , after completed compress bandage, shows that the bandage may be to tight. Which one?
Swelling above the bandage.
Blue colour of the skin above the bandage.
Heartbeat increase and a dizzy feeling.
Swelling below the bandage and heavy pain.
Which of the following requirements regarding on board stability data corresponds to present regulations? (NSCL 4/12.1)
Drawings and caculations documenting the stability of the ship, both in intact and all possible damage condition.
A calculation example showing the use of "KG" limitation curves.
A calculation example showing use of "GM" limitation curves.
Stability data produced by stability calculation instruments.
*A particular vessel is equipped with the possibility to insert CO2 in the scavenging air belt in case of uncontrolled fire. What are the actions to be taken in case of fire in the scavenging air belt?
Reduce the RPM to reduce the scavenge air temperature
Continue running the engine on regular speed, insert immediately the full amount of CO2 provided and await the fire to burn out
Continue running the engine on regular speed, waiting for the fire to burn out by itself. Increase the RPM, waiting for the fire to burn out by itself
When the temperature is reduced and in case the fire is not extinguished by itself, insert carefully CO2 to prevent cracks on the liners
The ship is berthed in a steady offshore beam wind of 30 knots which suddenly increases to 60 knots. What will be the change of force exerted on the ship driving it off the jetty?
The force will be Doubled
The force will be Tripled
The force will be Quadrupled
The force will be Quintupled
Is piracy an increasing or decreasing problem?
Piracy is not a probably
Piracy is decreasing
Piracy has remained constant for the last 50 years
Piracy is increasing
Which of the following information shall be specified by the muster list ?
the muster list has been prepared and approved by the Administration before the ship proceeds to sea.
the abandon ship signal consisting of two long blasts.
the specific duties assigned to passengers that are in charge of a group of others.
details of the general emergency alarm signal consisting of seven or more short blasts, followed by one long blast.
Give the meaning of this symbol:
lifebuoy with line
lifebuoy
lifebuoy with light and smoke
lifebuoy with light
A person wearing a thermal protective aid shall be able:
to climb up and down a vertical ladder
to wear a lifejacket inside
to jump into the water from a height of 4.5m
to swim a short distance trough the water and board a survival craft
Which one of the listed requirements regarding rescue boat equipment do not correspond to present regulations? The normal equipment of every rescue boat shall include:
a first-aid outfit in a watertight case
an efficient radar reflector
immersion suits for the number of persons the boat is permitted to accommodate
two buoyant rescue quoits attached to not less than 30m of line
If conditions permit, which is the best way to board a liferaft which is floating close to the ship?
Jump into the water close to the raft, without a lifejacket, as this will make it easier to swim and board the liferaft
Jump onto the raft itself
Wearing a lifejacket, jump into the water close to the raft and then swim to it
Use a rope ladder close to the raft to climb down and board
The Training Manual shall contain instructions and information on the life-saving appliances and the best method of survival. Which of following detailed explanations of crew duties in relation to emergency situations shall be contained therein?
The method and use of sea-anchors (drogues)
The use of oars and other propulsion equipment for survival crafts
The use of navigational equipment for survival crafts
Correct donning of fire protective clothing
Signals are often used by aircraft engaged in search and rescue operations to direct ships towards a casualty. This aircraft flies across your stern, rocking his wings. What is the meaning of the signal?
The aircraft is telling me he does not understand my last message.
The assistance of your vessel is no longer required.
This is part of a sequence of manoeuvres by which the aircraft will indicate a direction for my vessel to proceed in.
The aircraft is telling me he is preparing to drop supplies or personnel in the water.
On the figure there are four (4) possible definitions of the term "QUAY" given. Which one is the correct one?
Quay is given by D on the figure
Quay is given by A on the figure
Quay is given by C on the figure
Quay is given by B on the figure
During replacement of the main bearing shells on a medium speed diesel engine it is necessary to remove both the top and bottom half shells. From the options given select the method that is most commonly employed to remove the bottom half shells from the bearing pockets on an engine with a traditional bedplate?
Jack up the crankshaft and use a suitable punch to loosen the bottom half shell in the pocket so it can be lifted out with a pair of grips.
Fit a driver in the crankshaft oil hole which bears against the edge of the bottom half shell and turn the engine.
Turn the engine to a position where the crank webs are clear of the shell and knock the bottom half shell out axially using a suitable punch.
Remove the crankshaft so that all the bottom half shells can be removed at the same time.
Which of the following fluids usually has the lowest density at normal ambient temperatures?
Marine diesel oil.
Heavy fuel oil.
Lubricating oil.
Sea water.
Under U.S. Occupational Safety and Health Administration (OSHA) regulations when is a Vertical Tandem Lift possible?
When two intermodal containers one on top of the other are connected by semi-automatic twistlocks
When three intermodal containers in a stack are connected by fully-automatic twistlocks
When two intermodal containers one on top of the other are connected by fully-automatic twistlocks
When three intermodal containers in a stack are connected by semi-automatic twistlocks
Your vessel is equipped with fixed rotating tank-cleaning machines in every tank. You have just finished cleaning, in preparation for loading a cargo which is water-sensitive. What should you do with the machines?
It is not necessary to do anything. The amount of moisture remaining in a tank-cleaning machine could not affect the quality of the cargo in any way.
Ensure they are thoroughly drained down and blown through, using de-humidified air or nitrogen as applicable.
The nozzles and drain holes should be plugged.
They should be removed from the tank.
What is important to prepare prior to a helicopter operation?
To stop the vessel completely
Make sure all loose deck equipment at helicopter deck is stowed away and secured.
To increase the speed of the vessel
To light up the area for pick-up
What is the purpose of having deep tanks on a general cargo ships?
Primarily for ballasting and to aid the stability when loaded, but may be used for liquid cargo
To raise the centre of gravity of the ship and make it a smaller GM and reduce the rolling period
To carry bulk grain
To hold solid ballast
Why do rolled joints of meat carry a higher risk of bacterial infection?
Because rolled joints are normally purchased already prepared and the quality control of a shore supplier can not be guaranteed.
Because meat of a poorer quality is generally used in rolled joints.
Because any bacteria that were present on the outside surface of the meat will be transferred to the inside when the joint is rolled.
Because the temperature necessary to kill bacteria can never be reached in the middle of a rolled joint.
What name is given to the process of discharging water from a designated slop tank whiler minimising the disturbance of the oil layer on top, with the objective of removing as much water as possible?
Decanting.
Discharging.
Deballasting.
De-layering.
Which of the 4 alternatives shows a NPN transistor?
Figure 4.
Figure 3.
Figure 2.
Figure 1.
A clogged / dirty lube oil filter can be detected best by:
The pressure drop across the filter.
Visual inspection of the filter elements.
A decrease in oil viscosity.
High lube oil temperature.
Which of the following alternatives are recommended when decanting water overboard from the sloptank?
Maintain a speed of at least 12 knots when pumping overboard
Leave a "cushion"of water in the sloptank, to minimize the risk of polluting the sea
Using dispersing chemicals in the sloptank
Discharge under the waterline to avoid any sheen on the surface
Which of the following is a summary of the tank cleaning requirements for a category "X" substance on a chemical tanker constructed after 1st January 2007?
Strip to 75 litres / 12 miles from land / 25 metres of water / minimum 7 knots, proceeding en route.
Prewash for solidifying or high viscosity substances / strip to 75 litres / 12 miles from land / 25 metres of water / minimum 7 knots, proceeding en route.
Prewash / strip to 75 litres / 12 miles from land / 25 metres of water / minimum 7 knots, proceeding en route.
Prewash / strip to 100 litres / 12 miles from land / 25 metres of water / minimum 7 knots, proceeding en route.
In a cascade type direct cooling plant, as fitted to some liquefied gas carriers for cargo reliquefaction duties, a refrigerant gas is used to give final cooling and condensation of the cargo vapours. What level of refrigerant would you expect to see in the liquid receiver sight glass when the plant is operating at normal load?
The sight glass should be 10 -30% full.
The sight glass would normally be completely empty when the plant is on load.
The sight glass would normally be completely filled when the plant is on load.
The sight glass should be 80 - 95% full.
Continuity testing of a delta connected three phase induction motor yields the following results; U-V =3 ohms, V-W =3 ohms, W-U =6 ohms.Which of the following is the likely condition?
Short circuit winding between W and U
Open circuit winding between W and U
Short circuit between V and Earth
Partial fault between W and U
A hazard is is a source of potential harm or damage or a situation with potential for harm or damage. Risk is determined based on evaluation of two elements. Which two elements?
The likelihood that a hazard may occur and the consequences of the hazardous event
The likelihood that a hazard may occur and the financial consequences for the Company
The likelihood that a hazard may occur and the available personal protective equipment we have onboard
The consequences of the hazardous event and the available personal protective equipment we have onboard
Why should a heavy lift derrick not be operated close to the horizontal?
Because the topping lift sheave may fail
Because the derrick gooseneck might crack
Because the topping lift wire may part
Because there is danger of the derrick heel springing out of its shoe
If the high PPM alarm is actuated on an automatic O.W.S. What should happen?
The sludge pump stopped.
Overboard discharge is stopped.
Overboard discharge continues.
The oil outlet valve opens.
What name is given to the short, intial wash given to tanks that have just contained certain particularly hazxardous cargoes before the ship leaves the unloading port and where the washings are landed to shore or to a slop barge?
A mandatory customer post discharge wash.
A confirmation cycle.
A SOLAS pre-flush.
A MARPOL pre-wash.
The pumping and piping arrangement for a chemical tanker constructed after 1st January 2007 and carrying substances of categories "X", "Y" or "Z" must ensure that the maximum quantity of residues retained in a cargo tank and its associated piping must not exceed which of the following amounts?
300 litres.
100 litres.
75 litres.
10 litres.
When calibrating an pressure transducer we have to adjust both SPAN and ZERO. Please indicate in which order these adjustments should be done.
The order of adjustment is of no importance.
First Span adjustment and then Zero adjustment. After that Span setting should be checked gain.
First Span adjustment and then Zero adjustment. After that Span setting should be checked again.
First Zero adjustment and the Span adjustment. Then Zero should be rechecked.
In discussing segregation, the IMDG Code defines what it means by the term "separated from". Which of the following is that definition?
Either in a vertical or horizontal separation: if the intervening decks are not resistant to fire and liquid, then only in a longitudinal separation is acceptable. For "on deck" stowage, this means a distance of at least 12 metres. This distance also applies to one package stowed "on deck" and another in an upper compartment.
With an intervening compartment, being both a vertical and horizontal separation. Provided an intervening deck is resistant to liquid and fire, a vertical separation of 6 metres is acceptable. For "on deck" stowage, this segregation means a distance of at least 12 metres irrespective of compartment divisions.
Effectively segregated so that the incompatible goods cannot interact dangerously in the event of an accident, but may be transported in the same compartment or hold or on deck, provided a horizontal separation, projected vertically, of 3 metres is obtained.
In different compartments or holds when stowed "under deck". Provided an intervening deck is resistent to fire and liquid, a vertical separation may be accepted as equivalent. For "on deck" stowage, this segregation means a distance of at least 6 metres.
Some centrifugal cargo oil pumps are designed with an automatic stripping system, which allows the cargo oil tank to fully discharge its contents. By what principle does such a stripping system operate?
On the basis that, if cargo vapour can be stopped from entering the cargo pump suction inlet, the flow will continue without cavitation.
By automatically reducing the rate at which oil cargo enters the cargo pump, such that any vapour lifted along with the liquid does not cause a loss of suction.
By the optimum size and positioning of the suction inlet that feeds the automatic stripping system, which ensures that the cargo oil tank is discharged to the maximum possible extent.
On the principle that if the suction is fitted low enough in the cargo oil tank and a specified minimum trim is maintained, suction will be available until the tank is completely discharged.
When could there be a demonstration of how to start a lifeboat engine?
There is an instruction card inside the lifeboat showing how to start the engine.
A demonstration could be arranged during a lifeboat drill
A demonstration is not necessary, because there are a limited number of persons who given the responsibility for starting the lifeboat engine
Starting the lifeboat engine is very easy and there does not need to be any demonstration
When checking the closed butt gap clearance of new piston rings prior to fitting onto the piston it is normal to try the rings in the liner so that the gap can be measured. From the options given select the best part of the liner to use to carry out these checks.
Near mid-height of the liner.
Near the bottom of the liner.
Near the top of the liner.
Just above the scavenge ports.
What is meant by the term 'feel over sequence' as applied to diesel engine operation following replacement of a crankshaft bearing?
Using the hand to feel for any loose fastenings or sharp edges before starting the engine.
Stop the engine after 2 hours running to check the bearing temperature by running the hand over it.
Stopping the engine to check the bearing temperature after a short period of operation and repeating this procedure at increasing running intervals.
Running the engine at low load and gradually increasing the load over a period of 12 hours.
What should one consider prior to loading machinery with caterpillar crawlers on the hatch covers?
The horizontal restraint of hatch covers
The horizontal restraint of hatch coamings
Maximum permissible loading of the hatch covers and the horizontal restraint of hatch covers and coamings
Maximum permissible loading of the hatch covers
In RoRo Cargo Planning What should be considered for the location of stowage of a heavy loads such as transformer, locomotive or work boats?
The discharge port rotation
Requests from the stevedore
The stability of the vessel, access to the location and the SWL of the stowage location
What extra precautions should be taken by the officers and crew if some of the passengers are disabled, i.e. using wheelchair, cane, blind etc.?
Locate them in large cabins to ease their stay.
All passengers that will require extra assistance, also in case of an emergency situation/ evacuation, must be registered in order to allocate crew to assist them if needed.
Passenger with some form for disability must travel with accompany, and live in same cabin or next door.
They must be placed in cabins on the same level as the muster station.
Why do we use stabilisers on passenger ships?
To adjust the trim of the vessel
To decrease the dynamic stability
To increase the intact stability
To decrease the rolling angle of the vessel
What will the cadet find in the engine store?
He will find The Bosun in the engine store
He won't find anything in the engine store
He will find the port anchor winch in the engine store
He will find new brake bands in the engine store
Routine maintenance insulation testing of a three - phase induction motor should cover which measurements?
AA-E, ZZ-E
U1-U2, V1-V2, W1-W2, U-E, V-E,W-E
U-V-W-E
U-E, V-E, W-E, U-V,V-W, W-U
Will it matter to the accuracy of the measurement how you install a resistance element in a thermo-well
Will only result in mechanical problems
No influence at all
Will have a minor influence on the measurement
Wrong installation will result in a major deviation in measurement
After communication plugs are connected, the ESD is tested from?
No testing required.
Shore.
Ship and shore.
Ship.
How will you act if you are helmsman and after making a turn to port you receive the order: “Steady as she goes”
Put the rudder midship and wait until she stops
Give counter rudder to stop her and keep the course
Read off the compass and keep her steady on the course
Put the rudder all the way to starboard to stop the turn
On a RoRo vessel, what is important with regard to a loading ramp resting on a jetty?
The position of mats between the ramp flap and jetty must be maintained at all times
Visitors must not be allowed access to the vessel via the ramp
The ramp's position must be maintained
It must not foul the ship's mooring ropes
Which of these situations will cause undue delay to a vessel at her port of discharge?
Slow operation of hatch covers
Carrying out an off-hire survey
Carrying out an open-hatch condition survey
Asbestos mixed with the cargo
How often shall watertight doors in main transverse bulkheads which is in use at sea be operated (tested)?
Every two weeks
Every month
Daily
Weekly
Why do cargo tanks on a chemical tanker commonly have their own individual pipelines and cargo pumps?
To permit faster loading and discharging rates.
To reduce the chances of cross contamination.
To simplify the piping layout.
To allow more dangerous cargoes to be carried.
Which type of material is normally used in the construction of a cargo tank designed for transporting LPG at atmospheric pressure?
Stainless steel.
Aluminium.
9% Nickel steel.
Carbon-Manganese steel.
What is normally seen as the greatest risk when operating a high pressure, water tube, steam boiler with an excessively high level of Total Dissolved Solids?
Pitting corrosion at the water level in the boiler water drum.
General corrosion of boiler tubes and fittings
Hard scale deposits on boiler tubes and fittings
Foaming and carryover of water into the steam range.
When talking about the properties of an oil cargo, what does "flammable" mean?
When it catches fire, flames may be seen, as well as smoke.
That it does not need an external ignition source to cause it to burn. It will do so by itself.
That it is not capable of burning.
That it is capable of being ignited and of burning.
A refractory material is one that will retain its solid state even at very high temperatures, and furnace temperatures as high as 1650 °C have been recorded in marine boilers. What is the primary purpose of using a refractory?
They act as a heat sink, and ensure more even distribution of heat throughout the furnace.
All of the mentioned alternatives.
They are used to protect exposed parts of drum, which otherwise could become overheated.
To protect the furnace casing from overheating, burning and possible escape of gases into boiler room.
From the options given, select the most appropriate equipment for washing down a cargo space used for refrigerated cargo.
An air hose connected to a freshwater supply.
A mop and squeegee bucket filled with fresh water..
A fresh water hose connected to a fresh water supply.
A fire hose connected to the fire main..
When a blackout occurs: what should be your first reaction?
Investigate the cause of the blackout
Inform the Chief Engineer
Inform the bridge about the reason for blackout, and expected time to restart.
Cancel audible alarms
At what time should lashings be released?
As soon as the weather conditions are favourable, lashings can be released.
Lashings should not be released for unloading before the ship is secured at the berth, without the Master's express permission.
The crew can release lashings prior to arrival to avoid any delays.
Lashings should be released when the ship enters enclosed waters.
In a PID controller we have possibility to change the setting of the Proportional band (P), the Reset time (1) and the Rate time (D). Please indicate which curve shows the typical response to a change in input, if the setting of the proportional band is too wide.
Figure 1.
Figure 3.
Figure 4.
Figure 2.
On fully pressurised liquefied gas carriers the cargoes are usually carried at atmospheric temperatures. Is frostbite still a hazard on such vessels if there is leakage from the cargo pipe system?
Yes, but only if cargo vapour contacts the skin.
No frostbite is only a hazard when cargoes are refrigerated.
No, the cargo will vapourise and disperse quickly.
Yes, the liquid will flash off to its' fully refrigerated tempearature.
Under international regulations what must be ensured when discharging a bulk cargo?
The vessel must not be excessively trimmed
The method of unloading must not damage the ship's structure
The terminal representative must remain on board at all times
The stevedoring foreman must remain on board at all times
What ensures the safe operation of twistlocks?
The spring holding the twistlock cone in the ‘neutral’ position being resilient
The spring holding the twistlock cone in the ‘closed’ position being resilient
The spring in any position of the twistlock cone being stretched to its maximum limit
The spring holding the twistlock cone in the ‘open’ position being resilient
Why may wearing sweat rags slung round your neck when working in the machinery spaces be hazardous?
The rags may cause sweat rash.
The rags may cause you to get too hot and faint.
The rags may be caught by running machinery or power tools.
The rags may be soaked with oil and catch fire.
In which cases shall side scuttles in passenger ships be so constructed that they cannot be opened without the consent of the master of the ship?
Where the height of the side scuttles go through more than two decks
Where the sills of the side scuttles are below the margin line
Where the sills of the side scuttles are less than 500 mm above the deepest load line
Where the sills are mounted below the bulkhead deck
Which of the following cargo types is a general cargo vessel best suited ?
Containers and heavy project cargo
Pallets tinned foodstuffs and drums chemicals
Bulk grain and bulk cement
Fruit and vegetable cargoes
When tuning a cascade control system, where do you start
The slave controller with the master controller in manual mode
The master controller
The slave controller with the master controller in auto mode
Both at the same time
Passenger ships shall either carry automatically self-righting liferafts or canopied reversible liferafts. What does it mean that a liferaft is automatically self-righting?
The liferaft will automatically turn back into an upright position when it is empty of people
One person can manage to turn the liferaft back into an upright position
The liferaft will automatically turn back into an upright position when it is fully loaded with people
It means the same as self-righting lifeboats
On the figure there are four (4) possible definitions of the term "MIDSHIPS" given. Which one is the correct one?
Midships is given by C on the figure
Midships is given by A on the figure
Midships is given by B on the figure
Midships is given by D on the figure
What is an A/D and a D/A converter?
A converter that converts alternating current into direct current and vice versa.
An amplifier for direct current.
A converter that converts an analogue signal to a digital signal and vice versa.
A converter stabilising the voltage.
It is very important to follow a maintenance schedule. Why?
Cleaning of the bowl is only needed.
Not important at all.
To prevent serious damages on main components.
To improve the purifier-s efficiency.
Which of the pressures is the most satisfactory at the suction of an air conditioning freon compressor?
4.5 bar
0.5 bar
7.0 bar
2.0 bar
An excessive pressure drop across a lube oil strainer could indicate:
Any of the above.
That the strainer needs cleaning.
That the relief valve is stuck open.
That the strainer is ok.
The main reason for the use of cylinder oil is to:
Lubricate the piston rings.
To protect the piston and liner.
To improve combustion efficiency.
Cool the piston and liner.
What is an effective means of measuring total dissolved solids in boiler water?
Conductivity test.
Not possible to test solids in boiler water.
Alkalinity test.
Chloride test.
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