The test consisted of 80 random questions. Total questions on this topic: 118
Your result: 54%
Right answers:
1
The continuity resistance of a 100 m long × 25 sq. mm cable (rated at 100 A) is to be checked. Which of the following results would you anticipate?
Correct answer:
Between 0,1 and 1,0 Ohm.
Your Answer:
Between 0,1 micro Ohm and 1,0 micro Ohm.
2
A galley hot plate uses a Nichrome/Magnesium Oxide heating element and is to be tested before being put into service for the first time. An insulation resistance test yields a reading of 0,3 M Ohm. Which action should be taken?
Your answer is correct:
Apply reduced voltage to the element for a few minutes. Then retest and if ok put into service.
3
A 6-Volt DC relay is to be used with a 12-Volt power supply. The relay requires a current of 0,1 Amp. What is the series resistance required?
Your answer is correct:
60 ohm.
4
In a distress situation, how many times or for how long should the emergency alarm signal be sounded?
Correct answer:
Until all crew members and passengers have reported to their respective muster stations.
Your Answer:
Until the signal “risk is over” or the order “abandon ship” is given.
5
How is a Safety Management Certificate obtained?
Correct answer:
Ship owner has Document of Compliance issued, and vessel is assessed and holds all statutory certificates.
Your Answer:
RSS issue SMC with Register.
6
What is the best method for ensuring that the cylinder powers of a high speed diesel engine, fitted with a monoblock multi-cylinder fuel pump, are correctly balanced?
Your answer is correct:
Have the fuel pump phased and calibrated in a test workshop.
7
Which personnel must undergo familiarization training on board?
Your answer is correct:
Everyone.
8
When performing electrical testing of a three phase motor, insulation resistance measurements may be influenced by which of the following?
Your answer is correct:
Temperature, humidity and surface contamination.
9
Why is it important that the correct tension is maintained in a diesel engine timing chain?
Your answer is correct:
Correct tension ensures that the chain and associated equipment is within normal loading limits.
10
When the cable length exceeds approx. 10 meters we normally have to, in case of a Pt 100, in some way compensate for the cable resistance. Do we also have to do this if we choose to use a T802 temperature sensor?
Correct answer:
No.
Your Answer:
Depends on temperature to be measured.
11
A transformer overheats while taking a shore supply. Which is the likely cause?
Your answer is correct:
Incorrect frequency.
12
The fuel tank contents gauges onboard a vessel are of the air bubble and bell type. The gauges are calibrated for a different fuel type to the actual fuel in the tanks. When correcting the actual contents of the tanks from the gauge readings which of the parameters given in the options is the most important?
Correct answer:
Fuel viscosity.
Your Answer:
Fuel density.
13
The muster list shall show the duties assigned to the different members of the crew. Which of the given duties necessarily have to be included in the muster list?
Correct answer:
Clearing escape routes.
Your Answer:
Preparation and launching of survival crafts.
14
In which of the following automated control processes will the time constant be of minor importance?
Correct answer:
Level control.
Your Answer:
I don’t know.
15
Continuity testing of a delta connected three phase induction motor yields the following results; U1-V1 = 4 Ohms, V1-W1 = 4 Ohms, W1-U1 = 4 Ohms. What is the value of continuity resistance for each winding i. e. U1-U2?
Correct answer:
6 Ohms.
Your Answer:
12 Ohms.
16
The turbocharger on a diesel engine is surging. Which one of the following options would be the most likely cause?
Correct answer:
Dirty scavenging air cooler on the air side.
Your Answer:
Dirty rotor blades and nozzle ring.
17
What kind of electrolyte is used for Nickel-iron batteries?
Correct answer:
Solution of potassium hydroxide (KOH) and water.
Your Answer:
Solution of zinc-carbon and water.
18
What does ISM stand for?
Your answer is correct:
The International Management Code for the Safe Operation of Ships and for Pollution Prevention.
19
An indicator card from a cylinder of a slow speed diesel engine shows a high maximum pressure occurring earlier in the cycle than normal with a normal compression pressure. From the options given, which action is most likely to identify the cause of the problem?
Your answer is correct:
Check if the fuel injection pump timing is correct.
20
A draw card obtained from a cylinder of a large 2 stroke diesel engine shows that both cylinder compression and maximum pressures are low. Cards from other cylinders indicate normal operation. What is the likely cause of this problem?
When starting three phase induction motors there is sometimes a need to use a star-delta starter. A star-delta starter exhibits the following characteristics while connected in a star.
Correct answer:
Reduced current and reduced torque.
Your Answer:
Reduced current and increased voltage.
22
Worn piston rings are allowing a small amount of piston blow-by on a 2-stroke main diesel engine cylinder, but due to the circumstances, it is not possible to stop and do a piston overhaul. What is the correct, temporary action to take?
Correct answer:
Increase cylinder oil feed rate slightly and monitor the scavenge space drains.
Your Answer:
Reduce speed.
23
What should be the healthy continuity resistance of a 220 V, 2,2 kW, 10 A heating element, when checked near to it’s rated operating temperature?
Correct answer:
22 Ohms.
Your Answer:
10 Ohms.
24
Two reference points for pressure exist, absolute zero and atmospheric pressure. What are pressures measured relative to absolute zero called:
Correct answer:
Absolute pressure.
Your Answer:
Pressure drop.
25
A transformer overheats while taking a shore supply. Which is the likely cause?
Your answer is correct:
Incorrect frequency.
26
When should a crew member joining a ship for the first time be given some training and instructions in the use of the ship’s fire-fighting appliances?
Your answer is correct:
As soon as possible but not later than 2 weeks after he joins the ship.
27
A transformer rated at 22 kVA, 440/220 Volts, 60 Hz, is used to step down the voltage to a lighting system. The low tension voltage is to be kept constant at 220 Volts. What load impedance connected to the low-tension side will cause the transformer to be fully loaded?
Correct answer:
2,2 Ohms.
Your Answer:
220 Ohms.
28
Which of the following is typical for a feed-forward control system?
Correct answer:
Control of the process inlet side.
Your Answer:
Mathematical calculation of the system response.
29
A medium speed diesel engine which is supported on a steel chocking system has had repeated problems with two of the chocks at the end of the engine on the port side becoming slack. This has led to some fretting damage to the bedplate and tank top in that area. What action should be taken to affect a cost effective permanent repair?
Your answer is correct:
Replace the damaged chocks with resin based chocks of an appropriate size.
30
When considering instrumentation systems, what is a typical symptom of a fault with the span of an instrument?
Correct answer:
Zero-point is accurate, but 100 % input is not giving 100 % output.
Your Answer:
100 % output is accurate, but Zero-point is wrong.
31
In the context of an automated control system, which controller must be tuned first in a cascade control system?
Correct answer:
The secondary controller.
Your Answer:
The primary controller.
32
What is the purpose of the relief valves fitted to the doors and casing of 2-stroke diesel engine crankcases?
Your answer is correct:
To relieve excess pressure in the crankcase resulting from a crankcase explosion.
33
Some diesel engines have alarm and slow down protection in the event of a fire in the scavenge boxes. Choose the option which would be a typical set point for giving a slow down of the engine in the event of a scavenge box fire?
Your answer is correct:
120 °C.
34
Which is the preferred method for starting an air conditioning refrigeration compressor which has been shut down for a period of time?
Correct answer:
Start with suction valve throttled in to minimise risk of drawing liquid refrigerant into the compressor.
Your Answer:
Start and stop repeatedly until suction pressure and oil pressure are normal.
35
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?
Correct answer:
Open circuit winding between W and U.
Your Answer:
Short circuit between W and U.
36
The main engine is running steady with an average exhaust gas temperature of approximately 350 °C. What would be a typical alarm/slow down setting for the cylinder exhaust gas temperature deviation from the average?
Your answer is correct:
+/- 50 °C.
37
What is the result of an “unusually large metacentric height”?
Your answer is correct:
The vessel will roll slowly or be unstable.
38
A portable oxygen analyser for use onboard ship is of the paramagnetic sensing element type. It is being used to test the atmosphere of a space onboard ship but starts to give erratic readings. There is no obvious indication as to why this is happening. Select from the options given the most likely cause of this problem:
Your answer is correct:
The sampling filter is partially blocked giving rise to wide pressure variations in the sampling chamber.
39
What is the maximum current that a 15 Volt, 3 Watt Zenerdiode can handle without damage?
Your answer is correct:
0,2 A.
40
When selecting switchgear to work with High Voltage it is important to use an appropriate arcing medium. What is meant by arcing medium?
Your answer is correct:
The gas, liquid or vapor, which will minimize creation of an electric arc as contacts open.
41
How can the pressure be regulated during start up of a positive displacement pump such as a gear pump?
Your answer is correct:
Adjustment of the pressure relief valve to recirculate part of the flow.
42
The pyrotechnics used to transmit visual signals to other vessels, boats or aircrafts are of the following type:
Correct answer:
All of the below mentioned.
Your Answer:
Rocket parachute flare.
43
Routine maintenance insulation testing of a three-phase induction motor should cover which measurements?
Correct answer:
U-E, V-E, W-E, U-V, V-W, W-U.
Your Answer:
U1-U2, V1-V2, W1-W2, U-E, V-E, W-E.
44
In what kind of measuring equipment might we find a Bourdon-tube?
Correct answer:
In a pressure transmitter.
Your Answer:
In a flow meter.
45
A medium speed diesel engine is used to drive a controllable pitch propeller through a suitable clutch and reduction gearbox. What should the propeller blade attitude normally be after the engine is started and before the clutch can be engaged?
Your answer is correct:
The blades should be in the zero pitch position.
46
A cable has a resistance of 100 milli-ohms. It supplies a 300 A load over a distance of 100 meters. What is the voltage drop along it’s length?
Correct answer:
30 volts.
Your Answer:
300 millivolts.
47
The engine turns over normally when starting air is supplied but does not fire even though normal starting rpm is achieved. What could be the probable cause to this?
Correct answer:
Air in the fuel oil system.
Your Answer:
The turbocharger has not run up to normal full speed.
48
The majority of conventions adopted under the auspices of IMO fall into which of the three main categories?
Your answer is correct:
Maritime Safety, Prevention of Marine pollution, Liability and compensation.
49
When measuring level of liquids with a conductivity level indicator, measurement is performed by:
Your answer is correct:
Electrodes.
50
How does the maximum oil film pressure in a white metal journal bearing operating under full fluid film conditions compare with the pressure of the lubricating oil supply system?
Correct answer:
The pressure is greater than the pressure in the lubricating system and varies with the journal load.
Your Answer:
The pressure is less than the pressure in the lubricating system and varies with the journal load.
51
The main engine is running steady with an average exhaust gas temperature of approximately 350 °C. What would be a typical alarm/slow down setting for the cylinder exhaust gas temperature deviation from the average?
Your answer is correct:
+/- 50 °C.
52
Why shall a duly qualified officer supervise any potential polluting operation?
Your answer is correct:
To avoid pollution.
53
Low voltage ships tend to have insulated neutral systems. What is the reason for this?
Your answer is correct:
In the event of an earth fault vital equipment will not trip.
54
What should be the healthy continuity resistance of a 220 V, 2,2 kW, 10 A heating element, when checked near to it’s rated operating temperature?
Your answer is correct:
22 Ohms.
55
How often should the lifeboat wire falls be turned and renewed?
Correct answer:
Turned at intervals of not more than 30 months and renewed every 5 years.
Your Answer:
Turned every 30 months and needs only to be renewed if the wire is in poor condition.
56
When turning a cascade control system, which of the following actions should be done first?
Your answer is correct:
Adjust the slave controller with the master controller in manual mode.
57
Oil analysis results for a sample of diesel engine lubricating oil show a high level of tin. What could be the possible cause?
Your answer is correct:
Debris from damage to a white metal bearing.
58
Some ships generate electrical power at 440 V, but then step up this voltage to supply specific electrical equipment. One common example, may be to feed a large bow thruster. Why is this done?
Correct answer:
A large bow thruster will draw very large currents at low voltage. Being typically remote from the generator, significant voltage drops would occur at low voltage.
Your Answer:
The overall ship’s electrical load does not justify a High Voltage generating plant. This method allows more power to be delivered to the bow thruster at low running cost.
59
When work must be done on High Voltage equipment, it is vital that the equipment is earthed (grounded) after isolation procedures have been carried out. Why is this?
Correct answer:
To ensure that no energy remains in the system, and that it cannot be recharged by external influences.
Your Answer:
To ensure that it is dead, even if there was a flaw in the isolation procedure.
60
The cold room temperature is almost at the cut out point in a vapour-compression refrigeration system. What should the refrigerant state be just after the evaporator if the system is correctly set up?
Your answer is correct:
Slightly superheated low pressure gas.
61
In the context of an automated process control system, what is understood by the expression Master Controller?
Your answer is correct:
The primary controller in a cascade control system.
62
Why is an automatic slow turning feature included in the start air system of many large 2 stroke diesel engines?
Your answer is correct:
To avoid damage during start of the engine in case water or other liquid has gathered in the cylinders during an extended stop.
63
The operating mode of a pyrotechnic signal depends essentially on:
Your answer is correct:
Instructions or diagrams printed on its casing by the manufacturer.
64
A motor nameplate reads 75 hp. What is the reading in kW?
Your answer is correct:
56 kW.
65
The main propulsion diesel engine is normally started by direct admission of compressed air. Which one of the following statements is correct?
Correct answer:
A heavily leaking starting air valve may cause an explosion in the starting air pipe system.
Your Answer:
The starting air admission should continue until the engine has fired.
66
The charge air pressure supplied to a diesel engine, which is normally 2,0 bar, is reduced to 1,5 bar. What will be the likely effect on the engine operation?
Your answer is correct:
The performance of the engine will be reduced noticeably.
67
A thermistor, which provides feedback for a thermal control system, is suspected to have failed. Assuming there is no available replacement, which of the following methods may be used to prove it has failed?
Correct answer:
Disconnect the thermocouple lead from the controller, and replace it with a mV source.
Your Answer:
Connect a mA source in parallel with the thermocouple connections.
68
When carrying out repair or maintenance tasks involving hot work a hot work permit must be issued. Select the correct option from those given which completes the following statement. The permit for hot work:
Your answer is correct:
Should only cover specific hot work tasks, be valid for a specified time period and be issued by the person carrying out the work.
69
What should be the healthy continuity resistance of a 220V, 2,2kW, 10A heating element, when checked near to it’s rated operating temperature?
Your answer is correct:
22 Ohms.
70
In the circuit diagram shown the starter connects between which terminals?
Correct answer:
5 and 6.
Your Answer:
1 and 2.
71
The coil of a 12 V, 120 mA DC relay must be connected across a 24 V supply. What action should be taken?
Correct answer:
Install a 100 Ohm resistor in series with the coil.
Your Answer:
Install a 100 k Ohm resistor in series with the coil.
72
A transformer overheats while taking a shore supply. Which is the likely cause?
Your answer is correct:
Incorrect frequency.
73
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?
Correct answer:
Open circuit winding between W and U.
Your Answer:
Partial fault between W and U.
74
A ship’s electrical system operates at 60 Hz, but when connected to shore supply it is supplied with 50 Hz. Which of the following would you expect?
Your answer is correct:
Electric motors will run at reduced speed, and will tend to overheat.
75
What is the correct operation of the slow-turning facility fitted to some large 2-stroke main propulsion diesel engines?
Your answer is correct:
Slow turning should be set to operate automatically prior to engine start when engine has been stopped for 20 to 30 minutes during manoeuvring.
76
A 6-Volt DC relay is to be used with a 12-Volt power supply. The relay requires a current of 0,1 Amp. What is the series resistance required?
Your answer is correct:
60 Ohm.
77
A 250 V contactor has been fitted to a 220 V supply. Which of the following symptoms might be observed?
Correct answer:
Contactor chattering (vibrating).
Your Answer:
Contactor constantly on.
78
In case of a pollution in US waters, who shall notify the cleaning up contractor (OPA-90)?
Correct answer:
Qualified Individual.
Your Answer:
Emergency response team.
79
The cold room temperature is almost at the cut out point in a vapour-compression refrigeration system. What should the refrigerant state be just after the evaporator if the system is correctly set up?
Your answer is correct:
Slightly superheated low pressure gas.
80
When measuring viscosity with a restricted flow viscometer, the preferred sensing device is: