Test online for Cadets working in the Engine Room (CES v6.0)

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Правильные ответы:

In accordance with SOLAS and other international regulations, certain important machinery functions, such as operation and control of the steering gear and propulsion machinery, must be tested at specified times. When should these tests be carried out?

Правильный ответ:

Prior to arrival and departure from port and following maintenance.

Ваш ответ:

Only following drydock.

Tests on the water in a low pressure boiler show the chloride level is 500 ppm. What action should be taken?

Ваш ответ правильный:

Blow down boiler and check the condenser for leakage.

The Base Number of a lubricating oil is an indication of which of the following?

Правильный ответ:

The alkalinity of the oil.

Ваш ответ:

The viscosity of the oil.

A compressed air supply system has two automatically controlled air compressors. When demand is high both compressors are needed to meet the delivery requirements. What is the best method for controlling the supply from these compressors to meet a varying, but intermittent demand?

Ваш ответ правильный:

Sequential start initiated by pressure switches set at different switching pressures.

What is the reason for fitting “Rotocaps” to the cylinder head valves of some 4-stroke diesel engines?

Правильный ответ:

To extend the service life of valves by giving even heat and wear distribution.

Ваш ответ:

To help clear the cylinder of exhaust gas by spinning the exhaust valve during opening.

What characterizes a 2 stroke diesel engine?

Ваш ответ правильный:

A 2 stroke engine has an ignition every time the piston reaches its top position.

How is the temperature of the high temperature circuit of a central cooling system normally controlled?

Правильный ответ:

By mixing with water from the low temperature circuit.

Ваш ответ:

By controlling the flow through the fresh water evaporator heating circuit.

The auxiliary boiler for the supply of low pressure heating steam has an automatic combustion control which operates on a two step control principle. The boiler fails to attempt to start up during a period of normal operation even though the steam pressure has fallen below the set point. What is the most likely cause of this fault?

Правильный ответ:

The pressure switch for low steam pressure is faulty and fails to close.

Ваш ответ:

The electrical supply for the control system is isolated.

Why are crankcase heaters fitted to some refrigeration system compressors?

Правильный ответ:

To prevent refrigerant condensing in the crankcase when the compressor is stopped.

Ваш ответ:

To control viscosity of the lubricating oil.

During inspection of a high pressure fuel pump for a medium speed diesel engine it is observed that the upper leading edge and the lower helical edge of the pump plunger have suffered from erosion damage. Select the correct action to take to remedy this from the options given.

Правильный ответ:

Renew the plunger and barrel insert as a pair.

Ваш ответ:

Replace the complete pump with a new or reconditioned spare.

A mechanical seal, consisting of carbon and ceramic seal rings, is to be fitted to a centrifugal pump shaft. What is the most likely result of not being extremely careful when fitting this type of seal?

Правильный ответ:

The seal rings are brittle and can be easily chipped or damaged.

Ваш ответ:

The springs and bellows for the seal can be easily damaged.

At what pH-value should the engine cooling water be maintained?

Правильный ответ:

Between 7 and 9.

Ваш ответ:

Between 5 and 7.

Marine steam boilers are protected with a number of safety features which are designed to prevent damage to the boiler due to overheating or overpressure. How is this protection achieved when a very low water level condition (often referred to as low low level) develops during operation?

Правильный ответ:

All burners are automatically and immediately shut off.

Ваш ответ:

The main and auxiliary feed control valves open fully while all burners continue to operate.

When fitting a mechanical seal consisting of carbon/porcelain rings care should be taken that:

Правильный ответ:

All of the other alternatives.

Ваш ответ:

The seal is correctly assembled.

What action is required if boiler water tests confirm a pH value of less than 9?

Ваш ответ правильный:

Increase the dosage of alkalinity treatment chemicals until the pH value is back within normal range.

What is the main difference between a stuffing box gland and a mechanical seal on a centrifugal pump?

Правильный ответ:

If packing fails the pump can be kept running by tightening the glands, but if a mechanical seal fails it must be renewed to stop the leakage.

Ваш ответ:

Packed stuffing box glands are subject to wear but mechanical seals are not.

With reference to engine room operations, what does the term “Stand By” mean?

Правильный ответ:

The engineers should be ready to respond to bridge requirements.

Ваш ответ:

One should continue with ones work.

The main engine is running steady. What is the normal slow down temperature for scavenge air boxes “Fire alarm”?

Правильный ответ:

120 °C.

Ваш ответ:

50 °C.

Which of the following fluids usually has the lowest density at normal ambient temperatures?

Правильный ответ:

Lubricating oil.

Ваш ответ:

Heavy fuel oil.

Part of the outer surface of a refrigeration compressor crankcase and the refrigerant return line near the compressor ice up heavily during normal operation. Which of the options given is the most likely cause of this problem?

Правильный ответ:

The superheat control setting for the thermostatic expansion valve is set too low.

Ваш ответ:

The oil separator is not functioning correctly and is allowing lubricating oil to pass into the system.

While alongside at a repair berth a new section of seawater pipe has been fabricated in a shoreside workshop from drawings supplied by the vessel. During fitting of the pipe by ship’s engineers it is noted that the pipe is too short leaving a gap of about 8 mm between the flange faces. What action should be taken to remedy this problem?

Правильный ответ:

The pipe should be returned to the shoreside workshop for modification or to be remade to the correct dimensions.

Ваш ответ:

The ship’s engineers should fit extra thick joints between the flanges to fill the gap.

In a purifier assuming the separating temperature is correct, what is the probable cause of the processed oil containing water?

Ваш ответ правильный:

The gravity disc is too small and/or the flow rate is too high.

One cylinder of a diesel engine is operating with a high exhaust gas temperature. From the options given, select the one most likely to cause this condition.

Правильный ответ:

Fuel injection valve opening pressure is too low.

Ваш ответ:

Cylinder lubricating oil supply rate to the engine is excessive.

What is the purpose of a scum valve often fitted to a steam boiler?

Правильный ответ:

To allow removal of any oil or scum which collects on the surface of the water in the boiler steam drum.

Ваш ответ:

To allow removal impurities from the boiler feed-water.

Part of the outer surface of a refrigeration compressor crankcase and the refrigerant return line near the compressor ice up heavily during normal operation. Which of the options given is the most likely cause of this problem?

Правильный ответ:

The superheat control setting for the thermostatic expansion valve is set too low.

Ваш ответ:

The seawater flow control valve for the condenser is faulty allowing insufficient cooling water flow.

The main engine is running steady with exhaust gas temperature approximately 350 °C. What is the normal slow down temperature for exhaust gas deviation from average?

Правильный ответ:

+/- 50 °C.

Ваш ответ:

+/- 80 °C.

Which one of the statements given in the options is correct in relation to the maintenance and adjustment of 4-stroke medium speed diesel engines?

Правильный ответ:

Both the top and bottom shells of a bottom end bearing should be inspected as they can wear due to load reversal during the engine operating cycle.

Ваш ответ:

The piston ring groove clearances for the oil control ring are unimportant as this ring does not form part of the gas seal.

If you are going to enter the engines crankcase (go inside), how will you secure the engine after you have closed the main starting air valve?

Правильный ответ:

Engage the turning gear on the engine.

Ваш ответ:

Keep a man posted in the control room to watch that nobody tries to start the engine.

A piston ring set for a trunk piston engine often includes a slotted ring tensioned by an internal spring. What is the purpose of this type of piston ring?

Правильный ответ:

It is an oil control ring.

Ваш ответ:

It is the firing ring.

Medium and high speed diesel engines used for electrical generation duties on board ship have overspeed protection devices fitted to protect the engine in case the electrical generator trips while carrying high loads. Why are these devices necessary?

Ваш ответ правильный:

To stop the engine before any serious damage occurs due to excess inertial loads.

Which of the options represents the best action to take when an item of machinery, which normally operates in automatic mode, is operated in “manual” mode?

Ваш ответ правильный:

Monitor the operation of the machinery on a frequent basis.

After water-washing the turbocharger exhaust side, the blower starts to vibrate. What has happened?

Правильный ответ:

The rotor blades are damaged or the blades are not properly cleaned.

Ваш ответ:

Inlet filter partly clogged.

A simple level control for a water tank consists of a horizontal lever with a float at one end and a filling valve at the other. The lever is provided with an adjustable pivot positioned between the valve and the float. How will the “offset” in the system be affected under changing demand conditions if the pivot is moved closer to the filling valve?

Правильный ответ:

It will increase the offset across the demand range.

Ваш ответ:

It will reduce the offset on low demand but increase it during high demand.

What is the main precaution to be taken prior to engaging the turning gear for a diesel engine?

Правильный ответ:

Isolate the starting air supply.

Ваш ответ:

Open the crankcase doors.

What is the main reason for sometimes having a separate forced lubrication system for the camshaft on large cross head engines?

Правильный ответ:

To prevent any fuel leakage from the high pressure fuel pumps contaminating the oil in the main lubrication system.

Ваш ответ:

Because the camshaft system uses a different grade oil from that used in the main lubrication system.

Complete the following statement from the options given. “Following maintenance work to a single element, feed water regulator for a steam boiler it is necessary to…”:

Правильный ответ:

Apply lagging to the steam connection only.

Ваш ответ:

Apply lagging to the whole device.

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.

Правильный ответ:

Near the bottom of the liner.

Ваш ответ:

Near mid-height of the liner.

We have a problem with surging in the turbocharger. Which of the following could be the cause?

Правильный ответ:

Dirty scavenging air cooler on the air side.

Ваш ответ:

The lubrication oil pump is malfunctioning.

If a refrigeration system contains air, how would you remove it from the system?

Правильный ответ:

Pump the system down to the condenser, continue cooling water flow until the condenser is at the same temperature as the cooling water and vent off the air from the top of the condenser.

Ваш ответ:

Stop the compressor and vent the air from the crankcase.

When referring to onboard oil treatments using a centrifuge, what is meant by the term purification?

Правильный ответ:

Separation of two insoluble liquids with different densities, and the removal of solids in the same process.

Ваш ответ:

It is a general term applied to a process for cleaning oil using a centrifuge.

During inspection of a medium speed diesel engine main bearing the shell is found to have approximately 15 % of the white metal overlay worn away and some light score marks on the exposed aluminium tin bearing metal. Select the most appropriate action to take from the given options?

Правильный ответ:

Refit the shell as it is, this is an acceptable condition for a thin shell bearing after a period of service.

Ваш ответ:

Use a scraper to remove the remaining overlay before refitting the shell.

Which of the following options would be the cause of a low exhaust temperature in one cylinder of a diesel engine?

Правильный ответ:

Faulty fuel injection valve.

Ваш ответ:

Charge air cooler fouled on air side.

What will you do if the PH-value in the boiler water is under 7?

Правильный ответ:

Increase the dosage of chemicals, and take new test of the water.

Ваш ответ:

Nothing.

A slow speed diesel engine is fitted with a slow turning facility. How would the slow turning normally be set to operate?

Правильный ответ:

It should automatically operate before the normal start sequence following an engine stopped period of more than 20 to 30 minutes when manoeuvring.

Ваш ответ:

It should be manually operated before the normal start sequence following an engine stopped period of more than 10 minutes.

The packed gland on a centrifugal pump is leaking even though the gland has been “nipped up”. What is the correct action to take to stop the leakage?

Правильный ответ:

Re-pack the stuffing box loosely with the correct size packing at the earliest opportunity.

Ваш ответ:

Ensure the bilge well to which the leakage is draining is regularly pumped out.

What will happen if the charge air pressure drops?

Правильный ответ:

The performance of the engine is reduced noticeably.

Ваш ответ:

The turbochargers cooling water flow becomes to high.

Which of the following pumps will be damaged if the discharge valve is closed before the motor is stopped?

Правильный ответ:

Gear pump.

Ваш ответ:

Centrifugal pump.

When should adjustment to the fuel injection valve spring tension be made?

Правильный ответ:

Only on the fuel injection valve test rig.

Ваш ответ:

During engine operation when fuel timing to individual cylinders needs to be adjusted.

The exhaust temperature in a 4 stroke diesel engine is:

Правильный ответ:

Increasing with poorer cooling of the air in the air cooler.

Ваш ответ:

Decreasing if we lower the temperature of the fuel oil.

Why use a central cooling system?

Ваш ответ правильный:

It requires less maintenance.

What refrigerant temperature would you expect to find at the compressor suction of an air conditioning system?

Правильный ответ:

+5 °C.

Ваш ответ:

-10 °C.

A power card from a slow speed diesel engine cylinder is abnormal with a low height and the body of the diagram thicker than normal. What is the most likely cause of this?

Правильный ответ:

Fuel timing is retarded.

Ваш ответ:

Fuel timing is advanced.

In a low pressure auxiliary boiler, what would you consider to be the maximum allowable chloride level?

Правильный ответ:

300 ppm.

Ваш ответ:

1 000 ppm.

Your vessel has a controllable pitch propeller. The engine can be started when the propeller pitch is:

Правильный ответ:

Zero.

Ваш ответ:

10 % ahead.

How is the effective delivery stroke of a helix type fuel pump for a diesel engine controlled to increase or decrease the quantity of fuel delivered?

Правильный ответ:

Rotation of the plunger by the fuel rack from the governor signal.

Ваш ответ:

The fuel rail pressure relief valve setting.

During inspection of a high pressure fuel pump for a medium speed diesel engine it is observed that the upper leading edge and the lower helical edge of the pump plunger have suffered from erosion damage. Select the correct action to take to remedy this from the options given.

Правильный ответ:

Renew the plunger and barrel insert as a pair.

Ваш ответ:

Replace the complete pump with a new or reconditioned spare.

What effect would a blocked steam connection to a boiler water level gauge glass have on the visible water level in the glass?

Правильный ответ:

The level in the glass would be higher than the actual level in the boiler.

Ваш ответ:

The level in the glass would be less than the level in the boiler due to the water in the glass evaporating into the empty steam space.

The Base Number of a lubricating oil is an indication of which of the following?

Правильный ответ:

The alkalinity of the oil.

Ваш ответ:

Amount of contaminants in the lubricating oil.

Read this text and answer the question. “It is recommended that every prospective seafarer should, before being employed in a sea-going ship, receive proper training in personal survival techniques. In respect of such training general recommendations are made”. To whom should training in personal survival techniques be given?

Правильный ответ:

To all seafarers.

Ваш ответ:

To deck hands mainly.

What is generally considered as the minimum safe time period before opening a crankcase door after the oil mist detector alarm has activated and the engine has been stopped?

Правильный ответ:

After at least 20 minutes.

Ваш ответ:

After at least 10 minutes.

How is the condenser cooling water flow regulating valve automatically controlled in a vapour compression refrigeration system?

Ваш ответ правильный:

By the compressor discharge pressure.

What is a system employing a single common freshwater cooler (cooled by means of seawater) called?

Правильный ответ:

Central cooling system.

Ваш ответ:

Low temperature freshwater system.

The Total Base Number (TBN) is important as a measure of neutralizing ability of a diesel engine lubricating oil against strong acids formed during combustion. What action should be taken if the results from an oil analysis show that the TBN of the lubricating oil has reduced slightly?

Правильный ответ:

Freshen up the system by draining of some of the oil and adding a quantity of fresh oil.

Ваш ответ:

Purify the system oil in a centrifuge.

In a low pressure auxiliary boiler, if after testing the water you found the P. alkalinity to be 450 ppm CaCo3, what action would you take?

Правильный ответ:

Blow down boiler and reduce dosage.

Ваш ответ:

Decrease dosage.

What may be the cause of black smoke from the funnel?

Ваш ответ правильный:

Incomplete combustion owing to wrong mixture of air and oil.

Which of the options given is likely to be the reason for a drop in the charge air pressure supplied to a diesel engine by an exhaust gas turbocharger?

Правильный ответ:

Exhaust gas boiler fouled.

Ваш ответ:

Scavenge ports dirty.

How is the condenser in a fresh water evaporator normally cooled?

Правильный ответ:

With seawater.

Ваш ответ:

With brine.

With reference to non-VIT diesel engine high pressure fuel pumps that have helix control, how is the timing of fuel injection normally adjusted?

Правильный ответ:

By raising or lowering the pump plunger relative to the pump barrel.

Ваш ответ:

By changing the opening pressure setting for the fuel injection valves.

A large electric motor is being removed from a main seawater pump with the aid of the engine room crane. Which is the best method of starting the lift from the options given?

Правильный ответ:

Use a suitable chain block suspended from the crane hook to “break” the motor free after slackening all of the retaining bolts.

Ваш ответ:

Use the full hoist facility on the crane to “break” the motor free after slackening all of the retaining bolts.

What is the main problem associated with oil in a steam boiler water system?

Правильный ответ:

It forms an insulating film on heat transfer surfaces with the risk of overheating.

Ваш ответ:

It increases scale deposits in the boiler.

The main engine is running steady. What is the normal slow down/alarm pressure for “Fresh cooling water across engine”?

Правильный ответ:

0,2 bar.

Ваш ответ:

1,2 bar.

The main engine turbocharger speed has increased during the night while operating in UMS mode. From the options given, what is the most likely cause of this?

Правильный ответ:

The engine load has increased due to external factors such as current and wind.

Ваш ответ:

The engine load has reduced due to external factors such as current and wind.

Why are hypochlorite based treatments used on some sea water cooling systems?

Правильный ответ:

To prevent biological growth in the system.

Ваш ответ:

To reduce sediment build up in the system.

What would be a typical setting for the low lubricating pressure trip for a refrigeration compressor?

Правильный ответ:

+1,0 bar.

Ваш ответ:

+5,0 bar.

What shall you do if you are in the engine room and the alarm for “CO2 system in the engine room” is released?

Правильный ответ:

Leave the engine room immediately.

Ваш ответ:

Wait to make sure that the CO2-system is discharging into the engine room before leaving.

What would be a typical separating temperature range for purifying mineral oil based lubricating oil in a centrifuge?

Ваш ответ правильный:

65-85 °C.

Why is it necessary to use the vacuum pump after major overhaul of the reefer system?

Правильный ответ:

To evacuate air and water out of the system in order to prevent problem during operation.

Ваш ответ:

To make underpressure in the reefer system in order to get the freon liquid easy back to the system.

What will you do if you have a flash-back during gas welding?

Ваш ответ правильный:

Close the valves oxygen first.

You are in charge of a night bunkering operation. The delivery rate from the supplier is high and you are filling six tanks simultaneously. You lose track of the progress of the operation and feel that you are losing control of the situation. What action should you take?

Правильный ответ:

Stop bunkering, and establish facts, before bunkering is resumed.

Ваш ответ:

Open more tanks to slow down the filling rate of individual tanks.

Which symptoms would indicate piston blow-by when operating a 4 stroke trunk piston type engine?

Правильный ответ:

Increased pressure in the crankcase and smoke at the crankcase vent.

Ваш ответ:

Smoke and sparks from the scavenge manifold drains.

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