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

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Правильні відповіді:
1

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

Ваша відповідь правильна:

To prevent any fuel leakage from the high pressure fuel pumps contaminating the oil in the main lubrication system.
2

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

Ваша відповідь правильна:

Close the valves oxygen first.
3

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?

Ваша відповідь правильна:

Fuel timing is retarded.
4

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?

Ваша відповідь правильна:

Sequential start initiated by pressure switches set at different switching pressures.
5

At what interval should boiler water testing usually take place?

Ваша відповідь правильна:

Every day.
6

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

Ваша відповідь правильна:

Zero.
7

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

Ваша відповідь правильна:

Faulty fuel injection valve.
8

The exhaust temperature in a 4 stroke diesel engine is:

Правильну відповідь:

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

Ваша відповідь:

Normally lower than in a 2 stroke engine with equal load.
9

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?

Ваша відповідь правильна:

Use a suitable chain block suspended from the crane hook to “break” the motor free after slackening all of the retaining bolts.
10

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

Ваша відповідь правильна:

Separation of two insoluble liquids with different densities, and the removal of solids in the same process.
11

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.

Ваша відповідь правильна:

Fuel injection valve opening pressure is too low.
12

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?

Ваша відповідь правильна:

The pressure switch for low steam pressure is faulty and fails to close.
13

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

Ваша відповідь правильна:

Increased pressure in the crankcase and smoke at the crankcase vent.
14

Why are crankcase heaters fitted to some refrigeration system compressors?

Ваша відповідь правильна:

To prevent refrigerant condensing in the crankcase when the compressor is stopped.
15

What is the purpose of refractory linings in an oil fired steam boiler furnace?

Ваша відповідь правильна:

To prevent excessive furnace heat losses and protect tubes and other fittings from overheating.
16

Which of the following options is the most likely to result in the maximum cylinder pressure for all cylinders on a diesel engine to be lower than normal?

Ваша відповідь правильна:

Poor quality fuel.
17

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

Ваша відповідь правильна:

All of the other alternatives.
18

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

Ваша відповідь правильна:

65-85 °C.
19

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

Ваша відповідь правильна:

Incomplete combustion owing to wrong mixture of air and oil.
20

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

Ваша відповідь правильна:

To evacuate air and water out of the system in order to prevent problem during operation.
21

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

Ваша відповідь правильна:

+5 °C.
22

The main engine is running steady. What is the normal slow down temperature for the main bearing metal “Oil outlet temperature”?

Ваша відповідь правильна:

70 °C.
23

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

Ваша відповідь правильна:

It forms an insulating film on heat transfer surfaces with the risk of overheating.
24

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

Ваша відповідь правильна:

The engineers should be ready to respond to bridge requirements.
25

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

Ваша відповідь правильна:

The alkalinity of the oil.
26

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

Ваша відповідь правильна:

Isolate the starting air supply.
27

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

Ваша відповідь правильна:

By raising or lowering the pump plunger relative to the pump barrel.
28

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.

Ваша відповідь правильна:

Near the bottom of the liner.
29

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?

Ваша відповідь правильна:

Rotation of the plunger by the fuel rack from the governor signal.
30

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?

Ваша відповідь правильна:

To stop the engine before any serious damage occurs due to excess inertial loads.
31

When planning bunkering operations it is preferable to arrange for the new fuel to be bunkered into empty or nearly empty tanks whenever possible. What is the main reason for this?

Ваша відповідь правильна:

To minimise the risk of incompatibility between different fuels.
32

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

Ваша відповідь правильна:

Gear pump.
33

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?

Ваша відповідь правильна:

The seal rings are brittle and can be easily chipped or damaged.
34

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

Ваша відповідь правильна:

Leave the engine room immediately.
35

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

Ваша відповідь правильна:

0,2 bar.
36

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

Ваша відповідь правильна:

300 ppm.
37

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

Ваша відповідь правильна:

The gravity disc is too small and/or the flow rate is too high.
38

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?

Ваша відповідь правильна:

Stop bunkering, and establish facts, before bunkering is resumed.
39

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?

Ваша відповідь правильна:

Monitor the operation of the machinery on a frequent basis.
40

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

Ваша відповідь правильна:

+1,0 bar.
41

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

Ваша відповідь правильна:

Central cooling system.
42

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

Ваша відповідь правильна:

Blow down boiler and check the condenser for leakage.
43

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.

Ваша відповідь правильна:

Near the bottom of the liner.
44

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.

Ваша відповідь правильна:

Renew the plunger and barrel insert as a pair.
45

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?

Ваша відповідь правильна:

The pipe should be returned to the shoreside workshop for modification or to be remade to the correct dimensions.
46

What characterizes a 2 stroke diesel engine?

Ваша відповідь правильна:

A 2 stroke engine has an ignition every time the piston reaches its top position.
47

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?

Ваша відповідь правильна:

The superheat control setting for the thermostatic expansion valve is set too low.
48

Why use a central cooling system?

Ваша відповідь правильна:

It requires less maintenance.
49

What refrigerant temperature would you expect at the freon compressor discharge of a cascade system?

Ваша відповідь правильна:

+85 °C.
50

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?

Ваша відповідь правильна:

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.
51

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?

Ваша відповідь правильна:

It is an oil control ring.
52

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

Ваша відповідь правильна:

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.
53

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

Ваша відповідь правильна:

To allow removal of any oil or scum which collects on the surface of the water in the boiler steam drum.
54

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?

Ваша відповідь правильна:

To all seafarers.
55

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?

Ваша відповідь правильна:

Prior to arrival and departure from port and following maintenance.
56

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

Ваша відповідь правильна:

The alkalinity of the oil.
57

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?

Правильну відповідь:

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

Ваша відповідь:

Use a scraper to remove the score marks from the bearing metal before refitting the shell.
58

What will happen if the charge air pressure drops?

Ваша відповідь правильна:

The performance of the engine is reduced noticeably.
59

A vapour compression refrigeration system is usually fitted with a number of devices to give protection and control of the system. Which of the methods given in the options should be used to test the high pressure cut out during routine maintenance and checking of the system?

Ваша відповідь правильна:

Gradually shut in the condenser cooling water valve or the condenser refrigerant inlet valve while closely monitoring the compressor discharge pressure.
60

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

Ваша відповідь правильна:

Between 7 and 9.
61

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…”:

Ваша відповідь правильна:

Apply lagging to the steam connection only.
62

During the cycle of a four stroke diesel engine there is a load reversal on the bottom end bearing when the load transfers from the upper part of the bearing to the lower part. What is the main cause of this load reversal on a modern, turbocharged, medium speed diesel engine?

Ваша відповідь правильна:

The lack of gas load to oppose the inertial forces generated during the exhaust stroke.
63

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

Ваша відповідь правильна:

By mixing with water from the low temperature circuit.
64

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?

Ваша відповідь правильна:

Re-pack the stuffing box loosely with the correct size packing at the earliest opportunity.
65

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?

Ваша відповідь правильна:

Blow down boiler and reduce dosage.
66

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

Ваша відповідь правильна:

The rotor blades are damaged or the blades are not properly cleaned.
67

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

Ваша відповідь правильна:

With seawater.
68

A power card taken from a diesel engine cylinder using a mechanical indicator has a flat top. Which of the possible actions given in the options is most likely to correct this irregularity on the power card?

Ваша відповідь правильна:

Change the indicator spring for one with a higher rating.
69

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?

Ваша відповідь правильна:

The engine load has increased due to external factors such as current and wind.
70

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?

Ваша відповідь правильна:

The superheat control setting for the thermostatic expansion valve is set too low.
71

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

Ваша відповідь правильна:

Increase the dosage of alkalinity treatment chemicals until the pH value is back within normal range.
72

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?

Ваша відповідь правильна:

After at least 20 minutes.
73

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

Ваша відповідь правильна:

Increase the dosage of chemicals, and take new test of the water.
74

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?

Ваша відповідь правильна:

Freshen up the system by draining of some of the oil and adding a quantity of fresh oil.
75

During UMS rounds at night during a sea passage the duty engineer discovers the main engine lube oil pump starter “chattering” loudly. What is the correct action to be taken?

Правильну відповідь:

Switch over to the other pump and inform the CE of the noise immediately. Keep engine room manned.

Ваша відповідь:

Switch over to the other pump and leave the starter until the next morning. Continue UMS operation.
76

What is meant by the term “two stage air compressor”?

Ваша відповідь правильна:

A compressor in which the compressed air from the first stage is further compressed in the second stage before being delivered to the air receiver.
77

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?

Ваша відповідь правильна:

All burners are automatically and immediately shut off.
78

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?

Ваша відповідь правильна:

It will increase the offset across the demand range.
79

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

Ваша відповідь правильна:

By the compressor discharge pressure.
80

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

Ваша відповідь правильна:

Dirty scavenging air cooler on the air side.
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