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Question 1 from 90

Fire protected lifeboats when waterborne should be capable of protecting its full complement when subjected to a continuous oil fire that envelops the boat for a period of not less than how many minutes?

30 minutes

20 minutes

15 minutes

8 minutes

How many rocket parachute flares are carried in each liferaft with SOLAS B pack?

Nil

A lifebuoy light is capable of working at minimum for a period of, and has a luminous intensity of:

4 h, 1 candela (about 1,0 mile range at normal meteorological sight)

2 h, 2 candelas (about 1,7 mile range at normal meteorological sight)

4 h, 2 candelas (about 1,7 mile range at normal meteorological sight

2 h, 1 candela (about 1,0 mile range at normal meteorological sight)

Which of the following is allowed as a fire-extinguishing medium for fixed gas fire-extinguishing systems aboard ships?

All of the above gas are allowed

Carbon monoxide

Carbon dioxide

Carbon disulphide

What are the components of the personal equipment of the fireman's outfit

Protective clothing to protect the skin from heat, burns and scalding

All the items mentioned

Boots and gloves of rubber

A rigid helmet, an electric safety lamp and an axe

What mode is used for broadcast an MF/HF-DSC message:

H3E

J2B / F1B

J3E

Don't know

The emergency-battery of a GMDDS-portophone:

must be fully charged every day

must be tested once a week

cannot be charged

Don't know

Which of the following is a INMARSAT M Mobile Earth Station Identification Number (IMN)?

422753420

622753420

322753420

522753420

On what wave band does the search and rescue radar transponder operate?

2182kHz

8 GHz

6 GHz

9 GHz

For how long time should a SART transponder be able to operate in the stand by mode ?

8 hours

96 hours

24 hours

6 hours

Which of the following frequencies is used by the NAVTEX system ?

518kHz

121,5 MHz

156,8 MHz

2182 kHz

You are serving on a 5 year old chemical tanker. You are called upon to order a portable blower for ventilation of DB tanks, cofferdams & pipe tunnels prior entry & during inspection. You would order a blower of capacity:

Able to effect a complete change of air of the space being ventilated 16 times an hour?

Able to effect a complete change of air of the space being ventilated 4 times an hour?

Able to effect a complete change of air of the space being ventilated 12 times an hour?

Able to effect a complete change of air of the space being ventilated once an hour?

If you discover alcohol and drug abuse onboard, Whom do you report to?

The master.

Port authorities.

The manager.

Flag state authorities.

Which position is the best to stop bleeding from the nose?

Sitting on a chair, leaning forward, with two fingers pressing the nose together.

Laying on the back, holding a wet, cold towel on the top of the nose.

Holding the nose above steamed water.

Laying on the back, leaning the head as much back as possible.

In which way may intake of poisonous material occur?

All mentioned.

Skin penetration and skin absorption.

Swallowing.

By inhalation.

Most cases of oil pollution are caused by human errors, often jointly by seafarers and shore based clean-up teams. What has proved to be the essential mistake executed by the shore people regarding environment damages?

Usage of oilbooms?

Usage of sawdust?

Usage of absorbent pads?

Dispersement of chemicals?

A ship is equipped with a right-handed fixed pitch propeller, which when going from Full Ahead to Full Astern will make the ship sheer to starboard. Can anything be done to reduce this change in heading?

The rudder should be kept amidships when going astern and there is little that can be done to reduce the swing to starboard

The rudder can be put from side to side in a "Rudder Cycling" movement.

The rudder can be put to Hard to Port to reduce the water flow to the right side of the propeller

The rudder should be put Hard to Port to reduce the water flow to the left side of the propeller

" On area A3 the function "" Reception of shore to ship distress alerts"" is mainly based on:"

the use of SARSAT COSPAS Epirbs and NAVTEX

the use of VHF DSC and NAVTEX

the use of MF DSC and INMARSAT C SAFETYNET

the use of HF DSC and INMARSAT C SAFETYNET

What document is required before a mariphone is placed on board?

A license, given by or on behalf of the Minister of Traffic department

An inspection report of the mariphone

Don't know

An evidence that the annual contribution is paid

A VHF transmission range is mainly restricted by:

the length of the aerial

the curvature of the surface of the earth

reflection by the ionosphere

Don't know

MF radio signals mainly propagate mainly:

through hops between ionised layers and the earth

Don't know

between the earth and satellites

along the curvature of the earth

What is the most important factor influencing the VHF range?

the height of the antenna

the channel used

the type of message sent.

the size of the antenna

*A lifebuoy must have an outer diameter of:

800 mm

600 mm

400 mm

not more than 800 mm

Which one of the listed requirements regarding life-jackets corresponds to present SOLAS regulations ? A life-jacket shall be so constructed that:

it can be correctly donned within 3 minutes without assistance

it gives a long term thermal protection

it allows the wearer to jump from any height without injury and without damaging the life-jacket

it allows the wearer to jump from height of at least 4.5 m into the water without injury and without damaging the life-jacket

Which of the following features is required for an anti-exposure suit ?

is made of such a material that it cannot be torn

is marked with the name of the vessel to which the appliance belongs

is equipped with a pocket for a portable VHF

can be continously worn without impeding every duties to be performed by the wearer when in normal watch on the bridge

Which of the following actions should be done before throwing this type of inflatable liferaft over the side?

Disconnect the painter and launch it, checking that all is clear below

Inflate it on deck and then launch it if clear below

Check that the painter is made fast to a secure point and that the sea below is clear

Take circular gripes and adhesive tape (see photo) off the container to enable raft to inflate once in the water. If all clear, throw raft over side

An inflatable lifejacket will inflate:

Either automatically on immersion or by mouth

Automatically on immersion

Either automatically on immersion or by a single manual motion

Either automatically on immersion or by a single manual motion or by mouth

Give the meaning of the following symbol

Survival craft portable radio

Radar transponder

EPIRB

Survival craft distress pyrotechnic signals

The Muster List shall show the duties assigned to members of the crew. Which of the following duties shall be included according to present regulations?

Preparation of immersion suits for passengers.

Manning of fire parties assigned to deal with fires.

Operation of the vessel's propulsion system.

Special duties assigned with respect to the use of pyrotechnics

If the Radar scanners of one vessel are in the same horizontal plane as the cargo deck of the other during transfer operations, which type of radar emissions would pose a greater danger of the induced ignition of flammable vapours?

a 10 cm radar.

Neither a 10 or a 3 cm radar.

Both a 10 and a 3 cm radar.

a 3 cm radar.

Welding and burning are among the factors which give the highest risk of fire on board ships. Precaution has to be taken to avoid this risk. Which of the following safety rules may be regarded as the most important?

The welder shall have been instructed in the use of the ship's welding plant.

Only use electrodes from a well-known manufacturer.

Only holders of welding certificates shall be allowed to carry out welding on board ships.

Electric welding plants shall be controlled by a responsible engineer before use.

Your vessel is a tanker in ballast and the two vessels are interlocked after collision. You have already made clear that all people are well taken care of and you will try to separate the two vessels. What should be your greatest concern?

If the vessels separate, the other vessel may run away and you will be the only one to blame.

That the separation may cause sparks that can possibly ignite the oil or any other flammable substances.

The exact time of the collision.

That you have your permission from the company to do so.

What is understood by the term "take the helm"?

Change the place where the lookout is standing.

Take over heaving of a rope.

Take over the steering of the ship.

Take a message to another officer.

Under the IMDG code what class is assigned to a Fumigated Container?

Class 8

Class 9

Class 5

Class 6

A deep tank on a General Cargo ship has been cleaned after discharge of palm oil; what needs to be done to prepare the space for dry cargo?

Ladders checked, CO2 lines closed and temperature probes removed

Suction line blanked off, heating coils fitted and bilge system closed off

Heating coils removed, bilge suctions and CO2 lines opened and tested

Ballast lines opened up, ladders removed and air vents closed

The bottom end bolts for a high speed diesel engine are checked to see if they are fit for service by measuring the free length against a standard length. During overhaul the check reveals that one out of a pair of bolts has exceeded the recommended elongation limit. From the options given select the most appropriate action to be taken.

Replace all of the bottom end bolts in the engine with new spares.

Replace the pair of bolts with new spares.

Refit the bolts as long as one of them is within the limit it should be ok.

Replace the single bolt that has exceeded the limit with a new spare.

Which of the following is not a principle of heat transfer utilised in a boiler?

Ionisation.

Conduction.

Convection.

Radiation.

Which of the following knife types has a flexible blade, a round tip and is used for removing items from baking trays or spreading fillings and icing?

A griddle slice.

A paring knife.

A utility knife.

A palette knife.

What is the purpose of the "Mud Box" on a tanker?

It is at the end of the pipeline in the tank and restricts any particles and solids entering the pipeline system.

It is the waste collection box in the store rooms.

It is the box near the windlass to deposit the mud from the anchor and anchor cables.

It is the box under the manifold to catch spills when connecting the discharge or loading hose.

What could result from carrying coal with a high sulphur content on a Bulk Carrier?

Evolution of methane gases

Spontaneous combustion

A possible shift of cargo

Corrosion of steelwork in the cargo holds if the cargo becomes wet

In preparing a reefer vessel for loading the next cargo a careful inspection of the cargo spaces should be carried out. All required maintenance and the repair of any damage identified during the inspection should be completed prior to loading. Select, from the options given, the most appropriate action to be taken when the maintenance and any repairs are completed.

Keep a record of the hours worked as a basis for a claim against the previous charterers.

Make a detailed record of all maintenance and repairs carried out for presentation to the supervisor at the loading port as proof that the vessel is in an acceptable condition for loading the cargo.

Don't bother recording anything as this type of work is considered routine.

Keep a record of all the repairs in the planned maintenance schedule.

Why is air draught an important consideration when loading bulk cargoes on Bulk Carriers?

Because the vessel may pass under a bridge(s) whilst approaching or leaving the berth

Because of the vessel's movement whilst berthing or unberthing

Because of variations in under keel clearances whilst alongside the berth

Because of movement of the bulk cargo loader or unloaders

On oil tankers, Cargo tanks can be isolated from machinery spaces by:

Pump room

Ballast tanks

Cofferdams

All the answers are good

A deck patrol notices that a cargo space carrying refrigerated cargo under controlled atmosphere (CA) is not padlocked shut. Select, from the options given, the main reason why such a space should be kept locked.

It is a requirement of the ship security plan that such spaces should be locked.

To prevent unauthorised entry into the space because of the hazard risk due to low temperature in the space.

To prevent unauthorised entry into the space because of the hazard risk due to the low oxygen content of the controlled atmosphere in the space.

To minimise the occurrence of pilferage of a valuable cargo.

To avoid overbunkering and oil spill, it is very important that we keep a close monitoring of the bunkering progress, and this is done by sounding and calculations, the most reliable way is:

The remote gauge system will provide us with the necessary information

Take ullage soundings in the tanks from deck

Calculate time and flow, to find out how much oil is received

A combination of ullage soundings and readings from the remote gauges

What does MARVS mean on a cargo tank?

Maximum Allowed Relive Valve Setting.

Minimum Allowed Relive Valve Setting.

Maximum Recovery System.

Maximum ROB of Vapour.

What is the two letter signal, to be used by flags, radiotelephony or radiotelegraphy, meaning "Calling All Ships".

Normally ventilation fans in enclosed ro-ro spaces must be run continuously whenever vehicles are on board, why?

An increased number of air changes may be required when vehicles are being loaded or unloaded, or where flammable gases or liquids are stowed in closed ro-ro spaces

The manufacturer of the fans recommends continuous operation to reduce maintenance cost

It is better to run the fans continuously instead of testing the atmosphere

It is easier for the crew, they don't have to think about starting and stopping of fans

Prior to commence loading, in what way would you best ensure a smooth technical operation?

Test/check the COW system?

Test/check the cargo pumps?

Test/check cargo pipes?

All the mentioned alternatives?

The primary and secondary insulation spaces of each LNG cargo tank are provided with pressure relief valves. What is the normal set point of the relief valves for these spaces?

20 mbar.

15 mbar.

10 mbar.

5 mbar.

Why do all gas carriers have deepwell or submersible cargo pumps?

The use of electric motors.

It is not permitted to have cargo pomp-room below the upper deck.

To avoid having cargo pipes in cargo tanks.

It is cheaper and less complicated than pump-room.

Which of the following is an oval-shaped, purple coloured vegetable, with white, spongy flesh, native to tropical Asia but popular today in Mediterranean cookery?

Asparagus (asperge)

Angelica (dang-gui)

Artichoke (carchofas)

Aubergine (brinjal)

Why does MARPOL require debottoming of tanks prior to COW?

To prevent electrostatic generation

In order not to mix crude and water

To prevent corrosion in COW machines and COW piping

To prevent corrosion of tanks

Which of these are indicators that an individual may be a drug smuggler?

The individual wears bulky or out of season clothing.

The individual is disinterested in the ship’s cargo.

The individual spends his or her free time hanging out with others.

The individual makes small local purchases.

Which of the following international regulations is normally used when handling dangerous goods?

IMDG code

SOLAS code

KLMNG code

HB code

A hydraulically operated exhaust valve on a large slow speed diesel engine has been overhauled as part of the scheduled maintenance for the engine. During a test run of the engine the valve is found to be slamming shut. Which of the adjustments given in the options should be carried out to correct this condition?

The lift pressure for the relief valve in the hydraulic system should be reduced.

The lift pressure for the relief valve in the hydraulic system should be increased.

The throttle valve on the hydraulic system should be opened more.

The throttle valve on the hydraulic system should be closed in.

What is the function of the ESD on a gas carrier?

The function of the ESD is to close loading valves, switch of power to cargo compressors and pumps

The function of the ESD is to start cargo compressors or pumps

The function of the ESD is to close loading valves, switch of power to cargo compressors

The function of the ESD is to switch of power to cargo compressors and pumps

Cargoes of frozen beef and chilled beef have approximate carriage temperatures of minus 18 and minus 1 degree Celsius respectively. Greater care is required when carrying chilled beef as it is more sensitive to deviations from, and requires finer control of, its recommended carriage temperature. Which option best completes the following statement? "This additional care is worthwhile because…

...carrying chilled beef is a modern innovation."

…chilled beef is healthier for consumers."

…chilled beef can be kept longer than frozen beef."

…chilled beef commands a much higher price in the market."

What is the purpose of cooling down the cargo tanks before loading an LNG carrier?

To detect any serious loss of efficiency in the insulation which will show as frost on the mild steel inner hull.

To detect if liquid has gone from the bottom of tanks.

To control vaporisers and heaters so that temp of LNG vapour is higher than existing tank atmosphere temperature.

To avoid excessive boil off during and prevent thermal shock to the primary containment system.

From the options given, select the main reason why conventional mercury thermometers should not be used for taking pulp readings of a fruit cargo on a reefer vessel.

This type of thermometer is not sufficiently accurate.

This type of thermometer is difficult to calibrate.

This type of thermometer is not sufficiently portable.

The mercury may contaminate the fruit if the thermometer is broken while taking the readings.

What are the duties of engine room ratings forming part of an engine room watch?

To note all machinery not functioning properly.

To clean and maintain dirty equipment.

To assist in the efficient and safe watchkeeping.

To verify the current operational parameters.

On a Container vessel, what should a crew member do if a tank container on deck is found with a leaking valve?

Close the leaking valve

Wash away the leaking contents immediately

Raise an alarm

Report it immediately to the duty officer

How should pipes, rails and road sections be stowed?

Always in the athwartships direction

Fore and aft when practicable

Always fore and aft

Athwartships when practicable

You are on watch during a ship to ship petroleum cargo transfer operation. An electrical storm is observed in the close vicinity, approaching the ships' position. What is the recommended procedure?

Remove the deck scuppers in preparation for heavy rain.

Suspend all cargo transfer operations and close all tank openings and vents valves.

Maintain a close check on inert gas content in the tanks being worked on both vessels, but continue the cargo transfer.

Reduce cargo transfer rate to a minimum to reduce the rate of vapour expulsion from the venting system of the receiving vessel.

A range of dangerous goods are to be loaded on a General Cargo Vessel; the segregation requirements of the cargo are given in which publication?

The Cargo Securing manual

The IMO Bulk cargo Code

The IMO International Maritime Dangerous Goods Code

IMO SOLAS Handbook

The upper airway consists of:

Mouth, throat and lungs

Mouth, nose and throat

Mouth, nose and lungs

Mouth, throat and trachea

What distinguishes vapour connections (headers) from liquid cargo connections on a ship's manifold?

Liquid and cargo connections actually appear the same, but the ship's personnel always attach a small board to the applicable flange, identifying the cargo to be loaded and indicating whether it is for the liquid or vapour hose.

Vapour connections are painted yellow with green end bands, are marked with the words "not for liquid" and have a small hole capable of receiving a stud on the flange face at the six o'clock position.

Liquid connections are always marked with the corresponding tank number, while vapour connections are marked with the letter "V".

Vapour connections are painted yellow with red end bands, are marked with the word "vapour" (or "vapor") and have a small stud located on the flange face at the twelve o'clock position.

Chemicals and harmful substances are safely stored in a designated locker on board, why?

For safety reasons and stock control. When chemicals or harmful substances is delivered to a crewmember, the user shall sign for the amount received.

For stock control. Most of the chemicals and harmful substances we use on board are expensive.

Chemicals and harmful substances must be kept away from passengers so that they don't steal it.

For safety reasons. Many substances found onboard are capable of damaging the health and safety of those exposed to them. Before any chemical or harmful substance is delivered to a crewmember, the personnel shall receive training, instructions and information so that they know and understand the risks arising from use.

The reporting of incidents involving harmful substances and / or marine pollutants is regulated under which international guidelines?

Protocol I of MARPOL 73/78.

The UN Convention on the Reporting of Accidents and Incidents which Present a Hazard to the Marine Environment 2004.

Appendix B of the Supplement to the IMDG Code.

Annex II to SOLAS 1974.

What is meant by being intrinsically safe?

Electric wiring executed by approved manufacture?

Any electrical product, being water resistant?

Explosion proof product having a special wiring system?

Can not produce enough energy to ignite a gas (explode)?

How can the pressure be regulated during start up of a positive displacement pump such as a gear pump?

By throttling the discharge valve

By throttling the suction valve.

Positive displacement pumps operate at constant pressure and cannot be regulated.

Adjustment of the pressure relief valve to recirculate part of the flow.

A bulk cargo of Coal is to be loaded in Australia for Europe; the coal is declared as having a high moisture content (but less than the transportable moisture Limit (TML)); what must the Master ensure?

The bilges should have been sealed prior to loading

The bilges must not be pumped out

The bilges must be pumped out regularly

All cargo hold bilges are sounded daily and the amount of water logged; the bilges can then be pumped out.

Which of the following precautions would you take to ensure that you do not collapse due to the presence of gas in a recently cleaned cargo tank?

Refer to the applicable Enclosed Space Entry Permit to verify that the tank has been tested as gas free and is marked as safe for entry. If in any doubt, request a new test.

Wear a filter mask, fitted with the cartridge appropriate for the last cargo carried in that tank.

Enter the tank but, if the fumes become too strong, complete your task and leave as quickly as possible.

Tell another watch keeper that you are going down into the tank, making sure he knows exactly which tank it is.

What is important to keep in mind about U-profiles that are used on pipes supports?

They should only allow movement on the lateral axis.

They must not be fastened against the pipe.

They must be made of flexible material to protect against stress.

That they should be fastened tightly around the pipe.

What is the meaning of TLV and what unit do we use on it?

TLV is the threshold limit value and the unit is ppm - parts per million.

TLV is the total level value and the unit is ppm - parts pr million.

TLV is the technical limit value and the unit is ppm - parts per million.

TLV is the threshold limit value and the unit is litre.

Training is required when new equipment is installed on board the ship. What kind of training should be provided and for whom?

Every crewmember is responsible for their own training. Safety Officer should be contacted if any questions.

Theoretical and practical training should be provided for all personell involved in operation of the new equipment

No training is required for experienced seafarers

Theoretical and practical training should be provided for the head of department. Operation Manual for shall be available in crew mess room so that personnel involved in operation of the equipment can familiarise themselves with the new equipment.

What can be the punishment for a subordinate who unlawfully brings intoxicating beverages on board?

He shall be liable to fines or in especially aggravating circumstances to imprisonment for a term not exceeding 6 months.

He shall be liable to imprisonment for a term not exceeding three months.

He shall be liable to fines.

He shall be liable to fines or in especially aggravating circumstances to imprisonment for a term not exceeding three months.

Provided it is considered safe to do so what is the best method of cleaning a cargo hold that contained grain?

Sweep the cargo holds after discharge

Hose down the cargo holds after discharge

Sweep and clean cargo holds from the top down as discharge progresses

Sweep and clean cargo holds from the top down as discharge progresses followed by a final wash

What could be the cause of a refrigeration compressor running continuously even though normal temperatures for the cold rooms have been reached?

Low-pressure cut-out is stuck in closed position.

High-pressure cut-out is stuck in open position.

The differential pressure switch for the lubricating oil pressure cut-out is stuck in the closed position.

Solenoid valve before the expansion valve stuck in closed position.

High Voltage systems rely on the installed protective equipment being able to interrupt any fault in the system. Throughout the system, the fault level has been calculated, and under no circumstances must the system be modified to exceed this fault level. What is meant by fault level?

The amount of apparent power, that would be drawn from the generating plant, when a short circuit occurs at the bus bars.

The current level flowing into a dead short to earth at any point on the ship, directly from the High Voltage system.

The amount of apparent power that could flow into any fault at any point in the electrical network.

The current level flowing into a symmetrical short circuit fault between all three phases.

What is the minimum MARVS on a fully pressurised liquefied gas carrier?

Not be less than 7 bar.

Not less than the gauge vapour pressure of the cargo at 45 degrees C.

Not less than the gauge vapour pressure of the cargo at 0 degrees C

Not less than 0.7 bar.

What is Maximum Securing Load?

The load capacity of a device used to secure cargo on board

The combined safe working loads of various devices used to secure an items of cargo on board

The combined capacity of several devices used to secure an item of cargo on board

The safe working load of a device used to secure cargo on board

Why should only one set of ballast tanks be filled at any one time on a Bulk Carrier?

To ensure that bending moments do not become excessive

To prevent excessive lists developing

To ensure that free surfaces in ballast tanks do not become excessive during the ballasting operation

To keep the vessel trimmed by the stern

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?

Wash the element in a degreasing agent. Then retest and if ok put it into service.

Put the element into service.

Discard the element.

Apply reduced voltage to the element for a few minutes. Then retest and if ok put into service.

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?

Axial slip of one of the clamp rings to bring them closer together.

Circumferential slip of the after clamp ring in the opposite direction to shaft rotation.

Axial slip of one of the clamp rings to move them further apart.

Circumferential slip of the forward clamp ring in the opposite direction to shaft rotation.

On a Container vessel, when can twistlocks be used to lift containers?

When they are semi-automatic

When they are fully automatic

Only if they have been approved and certified for this purpose

When they are of the mid-lock design

A refrigeration plant is short cycling even though there is plenty of refrigerant in the system and all of the rooms are above temperature. From the options give select the one which is the most likely cause of the problem?

Low oil level in the sump causing the automatic low oil pressure cut out to operate.

Blocked filter drier causing the automatic low pressure cut out to operate.

Insufficient cooling water flow through the condenser causing the automatic high pressure cut out to operate.

Ice formation in the meat room evaporator coil causing the automatic low pressure cut out to operate.

While on watch an engine room rating notices a leak from the gland of the seawater pump which is running at the time. What action should be taken?

Place some jointing in way of the leak to direct the water into the bilge to stop it being sprayed around by the rotating shaft.

Change over the pumps and tell his relief at the end of the watch.

Remove the pump guard and tighten up the gland while the pump is still running to see that the leak stops.

Inform the engineer officer of the watch so that the pumps can be changed over and the gland can be repacked.

What will you do if you are helmsman and the OOW (officer on watch) gives you the order: “Port 20” and after a while the order: "Ease to 10"?

Turn the wheel until the rate of swing of the ship is 20 degrees per minute and then after the second order, reduce the wheel to make it swing at only 10 degrees per minute

Change the compass course to a new heading which is 20 degrees to port of original heading and then after the second command reduce it to only 10 degrees to port of original heading

Apply the wheel to alter the course 20 degrees to port and then after the second command change the heading a further 10 degrees

Apply 20 degrees of rudder towards port and then after the second command reduce the wheel to 10 degrees.

For ideal synchronising, the phase angle difference between the incomer e.m.f. and the busbar voltage should be:

0°

90° lag

30° behind

30° ahead

This online test consists of 90 random questions from CES 5.1 tests on a topic of your choice.