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

Test results

The test consisted of 80 random questions.
Total questions on this topic: 95
Your result: 49%
Right answers:
1

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?

Correct answer:

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

Your Answer:

The ship’s engineers should fit extra thick joints between the flanges to fill the gap.
2

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

Your answer is correct:

By mixing with water from the low temperature circuit.
3

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?

Correct answer:

+/- 50 °C.

Your Answer:

+/- 80 °C.
4

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

Correct answer:

Between 7 and 9.

Your Answer:

Below 5.
5

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?

Your answer is correct:

The superheat control setting for the thermostatic expansion valve is set too low.
6

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

Your answer is correct:

It should automatically operate before the normal start sequence following an engine stopped period of more than 20 to 30 minutes when manoeuvring.
7

What characterizes a 2 stroke diesel engine?

Your answer is correct:

A 2 stroke engine has an ignition every time the piston reaches its top position.
8

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

Your answer is correct:

Increase the dosage of chemicals, and take new test of the water.
9

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?

Your answer is correct:

Prior to arrival and departure from port and following maintenance.
10

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

Correct answer:

120 °C.

Your Answer:

50 °C.
11

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

Your answer is correct:

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

Your answer is correct:

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

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

Correct answer:

To prevent biological growth in the system.

Your Answer:

To prevent corrosion of the system.
14

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

Your answer is correct:

Incomplete combustion owing to wrong mixture of air and oil.
15

At what interval should boiler water testing usually take place?

Your answer is correct:

Every day.
16

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

Your answer is correct:

The gravity disc is too small and/or the flow rate is too high.
17

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?

Your answer is correct:

To minimise the risk of incompatibility between different fuels.
18

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

Your answer is correct:

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.
19

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

Correct answer:

+85 °C.

Your Answer:

+140 °C.
20

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?

Your answer is correct:

Fuel timing is retarded.
21

Why use a central cooling system?

Correct answer:

It requires less maintenance.

Your Answer:

It is more easy to operate.
22

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

Your answer is correct:

To prevent excessive furnace heat losses and protect tubes and other fittings from overheating.
23

Why are crankcase heaters fitted to some refrigeration system compressors?

Correct answer:

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

Your Answer:

To prevent ice from forming on the compressor casing.
24

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

Correct answer:

Isolate the starting air supply.

Your Answer:

Open the crankcase doors.
25

What will happen if the charge air pressure drops?

Your answer is correct:

The performance of the engine is reduced noticeably.
26

Chemical boiling out is one method that is used for cleaning the waterside of a steam boiler. Select from the given options the likely circumstances under which this procedure would be considered necessary?

Correct answer:

Contamination of the boiler water by oil.

Your Answer:

Excessive sludge build up in the water drum.
27

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?

Correct answer:

Engage the turning gear on the engine.

Your Answer:

Keep a man posted in the control room to watch that nobody tries to start the engine.
28

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

Correct answer:

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

Your Answer:

By changing the opening pressure setting for the fuel injection valves.
29

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

Correct answer:

Blow down boiler and check the condenser for leakage.

Your Answer:

Increase dosage of treatment chemicals.
30

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?

Correct answer:

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

Your Answer:

Use a scraper to remove the remaining overlay before refitting the shell.
31

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

Correct answer:

Gear pump.

Your Answer:

Centrifugal pump.
32

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

Your answer is correct:

+1,0 bar.
33

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?

Correct answer:

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

Your Answer:

The fuel injector setting.
34

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

Correct answer:

0,2 bar.

Your Answer:

1,2 bar.
35

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

Correct answer:

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

Your Answer:

To allow removal of sludge and mud which may collect in the bottom of the boiler water drum.
36

The exhaust temperature in a 4 stroke diesel engine is:

Correct answer:

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

Your Answer:

Decreasing if we lower the temperature of the fuel oil.
37

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

Correct answer:

All of the other alternatives.

Your Answer:

The seal is correctly assembled.
38

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?

Correct answer:

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

Your Answer:

Tighten up the gland as much as possible until the leakage stops.
39

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

Correct answer:

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

Your Answer:

Because the camshaft system uses a different grade oil from that used in the main lubrication system.
40

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

Correct answer:

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

Your Answer:

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.
41

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?

Your answer is correct:

To all seafarers.
42

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

Correct answer:

Lubricating oil.

Your Answer:

Sea water.
43

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

Your answer is correct:

Zero.
44

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

Your answer is correct:

To evacuate air and water out of the system in order to prevent problem during operation.
45

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?

Your answer is correct:

Monitor the operation of the machinery on a frequent basis.
46

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

Your answer is correct:

65-85 °C.
47

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

Correct answer:

By the compressor discharge pressure.

Your Answer:

By the quantity of refrigerant in the system.
48

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

Your answer is correct:

It forms an insulating film on heat transfer surfaces with the risk of overheating.
49

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

Correct answer:

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.

Your Answer:

Stop the compressor and vent the air from the crankcase.
50

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

Correct answer:

70 °C.

Your Answer:

60 °C.
51

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?

Your answer is correct:

Poor quality fuel.
52

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?

Your answer is correct:

The engine load has increased due to external factors such as current and wind.
53

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

Your answer is correct:

The alkalinity of the oil.
54

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

Correct answer:

+5 °C.

Your Answer:

+30 °C.
55

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

Your answer is correct:

300 ppm.
56

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

Your answer is correct:

Close the valves oxygen first.
57

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

Correct answer:

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

Your Answer:

It is a general term applied to a process for cleaning oil using a centrifuge.
58

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?

Your answer is correct:

To stop the engine before any serious damage occurs due to excess inertial loads.
59

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

Correct answer:

Dirty scavenging air cooler on the air side.

Your Answer:

Worn out bearings on the turbocharger.
60

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?

Your answer is correct:

All burners are automatically and immediately shut off.
61

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?

Correct answer:

After at least 20 minutes.

Your Answer:

After at least 1 hour.
62

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

Your answer is correct:

Leave the engine room immediately.
63

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?

Correct answer:

It is an oil control ring.

Your Answer:

It is the lowest compression ring.
64

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?

Correct answer:

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

Your Answer:

Switch over to the other pump and leave the starter until the next morning. Continue UMS operation.
65

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?

Correct answer:

It will increase the offset across the demand range.

Your Answer:

It will reduce the offset on low demand but increase it during high demand.
66

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…”:

Correct answer:

Apply lagging to the steam connection only.

Your Answer:

Apply lagging to the whole device.
67

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.

Your answer is correct:

Near the bottom of the liner.
68

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

Your answer is correct:

With seawater.
69

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?

Correct answer:

Exhaust gas boiler fouled.

Your Answer:

Scavenge ports dirty.
70

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

Correct answer:

Only on the fuel injection valve test rig.

Your Answer:

During engine operation when cylinder maximum pressures need to be balanced.
71

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

Correct answer:

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.

Your Answer:

The sealing surface of a mechanical seal is usually parallel to the shaft, but sealing surface of a packed gland is perpendicular to the shaft.
72

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?

Correct answer:

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

Your Answer:

Purify the system oil in a centrifuge.
73

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

Your answer is correct:

Increase the dosage of alkalinity treatment chemicals until the pH value is back within normal range.
74

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?

Your answer is correct:

The superheat control setting for the thermostatic expansion valve is set too low.
75

The duty engineer notices that there is full flow through overflow line observation glass to the fuel oil overflow tank. What action should be taken?

Your answer is correct:

Stop all F. O. transfers and other fuel operations immediately and check all fuel tank levels.
76

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

Correct answer:

Faulty fuel injection valve.

Your Answer:

Charge air cooler fouled on air side.
77

The main engine is running steady. What is the normal slow down temperature for the main engine thrust bearing segment?

Correct answer:

75 °C.

Your Answer:

60 °C.
78

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.

Your answer is correct:

Renew the plunger and barrel insert as a pair.
79

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

Your answer is correct:

The alkalinity of the oil.
80

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?

Your answer is correct:

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