Test Online for Seamans about Engine, Management Level (CES v6.0)
Test results
The test consisted of 80 random questions.
Total questions on this topic: 118
Total questions on this topic: 118
Your result: 89%
Right answers:
1
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.2
In tanker operations, there will be some areas and zones where flammable or explosive vapour, gas, or dust may be expected. Such areas are classified as hazardous. What is meant by hazardous area Zone 1?
Correct answer:
Flammable mixture is continuously present or present for long periods.Your Answer:
Flammable mixture is not continuously present, but will be present during normal operations.3
A 250 V contactor has been fitted to a 220 V supply. Which of the following symptoms might be observed?
Your answer is correct:
Contactor chattering (vibrating).4
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.5
How will continuous low load operation influence the time between overhauls, tbo, for the cylinder covers and associated valves of a 4-stroke diesel engine?
Your answer is correct:
Reduce the time between overhauls due to increasing fouling.6
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.7
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.8
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.9
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.10
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.11
Why shall a duly qualified officer supervise any potential polluting operation?
Your answer is correct:
To avoid pollution.12
When measuring level of liquids with a conductivity level indicator, measurement is performed by:
Your answer is correct:
Electrodes.13
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?
Your answer is correct:
No.14
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?
Your answer is correct:
30 volts.15
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 Ohm resistor in parallel with the coil.16
A transformer overheats while taking a shore supply. Which is the likely cause?
Your answer is correct:
Incorrect frequency.17
The circuit diagrams illustrate four different methods of wiring between a Pt 100 temperature sensor and its signal processing electronics. Which of the wiring methods gives the best measuring accuracy?
Your answer is correct:
Figure 1.18
Sometimes an early warning of failure in High Voltage switchboards may be an unpleasant smell. If the switchboard uses gas circuit breakers, which of the following may indicate a potential problem?
Your answer is correct:
Rotten eggs.19
In what kind of measuring equipment might we find a Bourdon-tube?
Your answer is correct:
In a pressure transmitter.20
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.21
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.22
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:
Disconnect the thermocouple lead from the controller, and replace it with a mA source.23
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.24
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.25
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?
Your answer is correct:
To ensure that no energy remains in the system, and that it cannot be recharged by external influences.26
After a couple of hours of operation the failure alarm sounds for a heavier fuel oil purifier which is operating on a timed automatic sludge cycle. Upon investigation the purifier is found to be running slowly and when opened up the casing and sludge outlet is heavily fouled with sludge in contact with the bowl. From the options given what is the most likely cause of this problem?
Your answer is correct:
The heavy fuel is unstable leading to excessive high viscosity sludge formation.27
In the circuit diagram shown the starter connects between which terminals?
Your answer is correct:
5 and 6.28
The torsion meter for the main propeller shaft is reading high. The torque is sensed using the angle of twist principle with two clamp rings attached to the shaft at a fixed distance, with stationary proximity switches for measuring the angle of twist and also shaft speed fixed to a rigid stool. What is the most likely cause of the high reading?
Your answer is correct:
Circumferential slip of the after clamp ring in the opposite direction to shaft rotation.29
What is the result of an “unusually large metacentric height”?
Correct answer:
The vessel will roll slowly or be unstable.Your Answer:
The vessel will roll violently.30
A two step controller (open/close) has failed and the only available spare controller is a P+I controller. Select, from the options given, how the P+I controller could be set up to achieve approximate two step control.
Correct answer:
Set the proportional band to maximum width and the integral action to minimum (repeats per minute).Your Answer:
Set the proportional band to minimum width and the integral action to minimum (repeats per minute).31
How is a Safety Management Certificate obtained?
Your answer is correct:
Ship owner has Document of Compliance issued, and vessel is assessed and holds all statutory certificates.32
Which of the following is typical for a feed-forward control system?
Your answer is correct:
Control of the process inlet side.33
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.34
The fuel consumption for the main diesel engine has gradually increased over a period of a few months. All system pressures and temperatures appear normal. From the options given, choose the one which is the most likely cause of this:
Your answer is correct:
Fouling of the hull.35
In which of the following automated control processes will the time constant be of minor importance?
Your answer is correct:
Level control.36
Some automated control systems use a master controller and a slave controller. What is the meaning of “remote mode” related to a slave controller?
Your answer is correct:
The slave controller receives the set-point from the output signal of the master controller.37
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?
Your answer is correct:
Between 0,1 and 1,0 Ohm.38
What does ISM stand for?
Your answer is correct:
The International Management Code for the Safe Operation of Ships and for Pollution Prevention.39
Who is responsible for ensuring that your ship’s security plan meets the requirements of the ISPS Code?
Your answer is correct:
Company Security Officer.40
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?
Your answer is correct:
Open circuit winding between W and U.41
When starting air is applied to a diesel engine the engine fails to turn over but is seen to oscillate back and forth. What is the most likely cause of this problem?
Your answer is correct:
One or more cylinder air start valves are stuck open.42
The operating mode of a pyrotechnic signal depends essentially on:
Your answer is correct:
Instructions or diagrams printed on its casing by the manufacturer.43
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.44
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?
Your answer is correct:
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.45
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.46
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.47
In the context of an automated control system, which controller must be tuned first in a cascade control system?
Your answer is correct:
The secondary controller.48
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.49
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.50
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.51
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.52
When considering instrumentation systems, what is the meaning of the expression “dead-band”?
Your answer is correct:
The controller will not react to a process change in this range.53
Why is it necessary to have an effective ballast water management plan which includes provision for changing out ballast in open water rather than discharging ballast in coastal waters?
Your answer is correct:
To avoid the introduction of non-indigenous species of marine life from one area to another.54
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.55
When measuring viscosity with a restricted flow viscometer, the preferred sensing device is:
Your answer is correct:
Capillary tube.56
The turbocharger on a diesel engine is surging. Which one of the following options would be the most likely cause?
Your answer is correct:
Dirty scavenging air cooler on the air side.57
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.58
Some fuel oil and lubricating oil separators have a facility to control the back pressure of the clean oil outlet during start up and operation. What is the purpose of this control function?
Your answer is correct:
To help to maintain the oil/water interface at the correct position.59
What type of dynamic forces may cause indent in plating on forecastle deck and main deck in way of pillars inside forecastle?
Your answer is correct:
Pressure forces caused by green water on deck.60
In terms of automated control systems, what is typical for a continuous control system?
Your answer is correct:
It is possible to predict the control mathematically.61
What is the advantage of a transmitter with a narrow measurement range?
Your answer is correct:
Better linearity and increased accuracy.62
A transformer overheats while taking a shore supply. Which is the likely cause?
Your answer is correct:
Incorrect frequency.63
A motor nameplate reads 75 hp. What is the reading in kW?
Your answer is correct:
56 kW.64
It is the Master’s responsibility to ensure that:
Your answer is correct:
Concerned personnel carry out the on-board training programme effectively.65
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.66
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.67
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.68
Which of the following options would be a typical differential pressure setting for a main engine slow down in the event of jacket cooling water system low flow?
Your answer is correct:
0,2 to 0,5 bar.69
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:
Correct answer:
Should only cover specific hot work tasks, be valid for a specified time period and be issued by the person carrying out the work.Your Answer:
Should only cover specific hot work tasks and be valid for a specified time period.70
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.71
The pyrotechnics used to transmit visual signals to other vessels, boats or aircrafts are of the following type:
Your answer is correct:
All of the below mentioned.72
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.73
A two step controller (open/close) has failed and the only available spare controller is a P+I controller. Select, from the options given, how the P+I controller could be set up to achieve approximate two step control.
Correct answer:
Set the proportional band to maximum width and the integral action to minimum (repeats per minute).Your Answer:
Set the proportional band to maximum width and the integral action to maximum (repeats per minute).74
Two reference points for pressure exist, absolute zero and atmospheric pressure. What are pressures measured relative to absolute zero called:
Your answer is correct:
Absolute pressure.75
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.76
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?
Your answer is correct:
6 Ohms.77
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.78
Which is the preferred method for starting an air conditioning refrigeration compressor which has been shut down for a period of time?
Your answer is correct:
Start with suction valve throttled in to minimise risk of drawing liquid refrigerant into the compressor.79
In case of pollution in US waters, do you always have to notify the National Response Center (OPA-90)?
Your answer is correct:
Yes, within thirty (30) minutes.80
This figure shows a transformer, with two windings, N(1) = 2 000 and N(2) = 1 000 turns, on a common magnetic circuit. Assume that there is no energy loss in the transformer itself. Calculate the current I(2) when the current I(1) = 2 A.
