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

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The test consisted of 80 random questions.
Total questions on this topic: 95
Your result: 84%
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Right answers:
1

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

Your answer is correct:

The alkalinity of the oil.
2

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

Your answer is correct:

Isolate the starting air supply.
3

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

Correct answer:

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

Your Answer:

Blowdown the boiler and refill with good feedwater.
4

Why are crankcase heaters fitted to some refrigeration system compressors?

Your answer is correct:

To prevent refrigerant condensing in the crankcase when the compressor is stopped.
5

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?

Correct answer:

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

Your Answer:

The electrical supply for the control system is isolated.
6

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?

Your answer is correct:

+/- 50 °C.
7

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.
8

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.
9

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.
10

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

Your answer is correct:

To prevent any fuel leakage from the high pressure fuel pumps contaminating the oil in the main lubrication system.
11

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.
12

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

Your answer is correct:

Faulty fuel injection valve.
13

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.
14

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

Your answer is correct:

Central cooling system.
15

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?

Your answer is correct:

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.
16

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?

Correct answer:

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

Your Answer:

Use the full hoist facility on the crane to “break” the motor free after slackening all of the retaining bolts.
17

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.
18

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

Your answer is correct:

By raising or lowering the pump plunger relative to the pump barrel.
19

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?

Your answer is correct:

The seal rings are brittle and can be easily chipped or damaged.
20

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

Your answer is correct:

Gear pump.
21

At what interval should boiler water testing usually take place?

Your answer is correct:

Every day.
22

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

Your answer is correct:

Zero.
23

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

Your answer is correct:

300 ppm.
24

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

Your answer is correct:

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

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.
26

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:

Pump the system down to the evaporator and keep the fan running until the evaporator is at ambient temperature and vent off the air from the top of the evaporator.
27

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.
28

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?

Your answer is correct:

Rotation of the plunger by the fuel rack from the governor signal.
29

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?

Your answer is correct:

Re-pack the stuffing box loosely with the correct size packing at the earliest opportunity.
30

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

Your answer is correct:

To prevent biological growth in the system.
31

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

Your answer is correct:

+85 °C.
32

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.
33

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.
34

What will happen if the charge air pressure drops?

Your answer is correct:

The performance of the engine is reduced noticeably.
35

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

Your answer is correct:

All of the other alternatives.
36

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.
37

Why use a central cooling system?

Your answer is correct:

It requires less maintenance.
38

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

Your answer is correct:

+5 °C.
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?

Your answer is correct:

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

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

Your answer is correct:

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

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

Your answer is correct:

With seawater.
43

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.
44

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?

Your answer is correct:

Stop bunkering, and establish facts, before bunkering is resumed.
45

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?

Your answer is correct:

Switch over to the other pump and inform the CE of the noise immediately. Keep engine room manned.
46

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?

Your answer is correct:

Sequential start initiated by pressure switches set at different switching pressures.
47

The exhaust temperature in a 4 stroke diesel engine is:

Your answer is correct:

Increasing with poorer cooling of the air in the air cooler.
48

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.
49

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?

Your answer is correct:

Blow down boiler and reduce dosage.
50

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

Your answer is correct:

The level in the glass would be higher than the actual level in the boiler.
51

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:

85 °C.
52

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.
53

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

Correct answer:

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

Your Answer:

The back pressure at the clean oil outlet is too high.
54

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.
55

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

Your answer is correct:

120 °C.
56

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.
57

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.
58

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.
59

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.
60

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 manufacture a spacer piece to fit the gap.
61

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?

Your answer is correct:

Engage the turning gear on the engine.
62

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.
63

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

Your answer is correct:

To allow removal of any oil or scum which collects on the surface of the water in the boiler steam drum.
64

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 temperature of the refrigerant after the evaporator.
65

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.
66

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.
67

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

Correct answer:

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

Your Answer:

Smoke and sparks from the scavenge manifold drains.
68

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

Your answer is correct:

75 °C.
69

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

Your answer is correct:

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.
70

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

Your answer is correct:

The alkalinity of the oil.
71

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.

Your answer is correct:

Fuel injection valve opening pressure is too low.
72

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

Your answer is correct:

The rotor blades are damaged or the blades are not properly cleaned.
73

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?

Your answer is correct:

It is an oil control ring.
74

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

Your answer is correct:

Only on the fuel injection valve test rig.
75

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

Correct answer:

+1,0 bar.

Your Answer:

+5,0 bar.
76

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:

Take another lub oil sample and send it for analysis.
77

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.
78

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

Your answer is correct:

Between 7 and 9.
79

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?

Your answer is correct:

Contamination of the boiler water by oil.
80

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?

Your answer is correct:

Change the indicator spring for one with a higher rating.
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