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Online testing: Test online CES 5.1 for Ch-Eng / 2nd-Eng
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The test consists of random questions on a selected topic.
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Which one of the listed requirements regarding lifeboat propulsion do not correspond to present regulations?
The engine shall be provided with an electric power starting system with rechargeable energy batteries
Every lifeboat shall be powered by a compression ignition engine using fuel with a flamepoint of not less than 44°C
Means shall be provided for recharging all engine-starting, radio and searchlight batteries
Water resistant instruction for starting and operating the engine shall be provided
On a dark night with a clear atmosphere, the outside manually controlled lamp of a liferaft is visible at minimum at a distance of:
2 miles
8 miles
4 miles
0,5 mile
A particular vessel is equipped with the possibility to insert CO2 in the scavenging air belt in case of uncontrolled fire. What are the action to be taken in case of fire in the scavenging air belt?
Continue running the engine on regular speed waiting for the fire to burn out, during continuous monitoring of condition.
Reduce the RPM to reduce the scavenge air temperature. When the temperature is reduced and in case the fire is not extinguished by itself, insert carefully CO2.
Continue running the engine on regular speed inserting CO2 awaiting the fire to burn out.
Reduce the RPM waiting for the fire to burn out, during continuous monitoring of condition.
*The number and positions of hydrants shall be such that:
At least three jets of water not emanating from more than two hydrants may reach any space of the ship accessible to passengers and crew
At least one jet of water may reach any part of the ship normally accessible to passengers and crew
At least one jet of water emanating from a single length of hose may reach any part of the ship normally accessible to passengers and crew
At least two jets of water not emanating from the same hydrant, one of which from a single length of hose, may reach any part of the ship normally accessible to passengers and crew
*The engine room is equipped with regular fire hoses and nozzles. What is important to observe when using water as an extinguishing agent in the engine room?
Water may short circuit electrical installation and may be a threat to the personnel operating the fire hose as well as to electrical equipment itself
All the mentioned alternatives
Water has a clear limitation in fighting an oil fire
To reduce the negative effect of water in an engine room, the spraying function to be used. The spray function will also give the personnel operating the fire hose good shelter against heat
In accommodation the automatic sprinklers shall come into operation within the temperature range: (SOLAS II-2/12.2.4)
68 - 79°C
48 - 55°C
56 - 67°C
80 - 90°C
Where is the Safety Certificates for ships to be kept?
In the Captain's office
Posted up in a prominent place onboard the ship
In the Captain's safe
In the Owner's office
If Mouth - to - Mouth (M-T-M) ventilation by itself is unsuccessful and the casualty's heart stops, or has stopped beating, you must perform External Chest Compression (ECC) in conjunction with M-T-M. What is the rhythm when performing M-T-M in combination with ECC with one First Aider only ?
15 compressions followed by 2 full ventilations.
5 compressions followed by 5 full ventilations.
20 compressions followed by 5 full ventilations
10 compressions followed by 3 full ventilations
*A cargo hold containing such cargo as nitrates, chlorates etc which produces oxygen under the influence of heat catches fire. If you have a lot of water at your disposal, how would you deal with this?
Close the hatches and use the fixed CO2 system because water cannot be used with this type of cargo
None of the above answers are correct
Apply boundary cooling only
Use large quantities of water as soon as possible
Give the meaning of the following symbol
Fire pump
Fire control plan
Gas detector
Emergency fire pump
When navigating using the GPS, how does the GPS display indicate when the accuracy of the displayed position is reduced?
The GPS display is always very accurate and does not give any indication of lack of accuracy.
A large Correction Factor is displayed on the screen
A large HDOP value is displayed on the screen
The GPS display flashes and sounds an alarm
While navigating using a paper chart marked WGS84 the OOW plots the ships position by four different methods and they all give slightly different positions. Which of the following would be considered the most accurate.
Radar ranges from two radar destinctive headlands
GPS set on WGS84 datum
Bearing and distance from a navigation buoy close to the vessel
Gyro compass bearings from two lighthouses
*Which of the following duties shall be included in the "muster list" as being assigned to members of the crew ?
operation of the vessel's propulsion system
use of communication equipment
preparation of manoeuvres intended to ease launching of the survival craft
preparation of immersion suits for the ship's passengers
Give the meaning of the following symbol:
lower liferaft to water
location of embarkation ladder
lower embarkation ladder to water
lower lifeboat to water
Give the meaning of the following symbol:
muster station
muster station for families only
gathering place for embarkation formalities
muster station for unaccompanied minors (UM)
Which one of the following requirements regarding lifebuoys corresponds to present SOLAS regulations?
Not less than half the total number of lifebuoys shall be provided with self-ignition lights.
All lifebuoys shall be placed in holders with quick-release arrangement.
At least two lifebuoys on each side of the ship shall be fitted with a buoyant lifeline.
At least one lifebuoy shall be placed in the vicinity of the bow.
Which one of the listed requirements regarding inflatable liferafts corresponds to present regulations? Every liferaft shall be so constructed that:
in the event of capsizing it will automatically attain a position providing an above water escape
have a floor capable of being sufficiently insulated against cold by means of inflated compartments, or by equally efficient means not dependant on inflation
have at least two entrances
it's canopy has viewing ports in all directions
*Which among the following list is required for lifeboat equipment according to present regulations ?
be made of fire-retardant material
be as small and of as little mass as possible
be made of buoyant material or stored in buoyant containers
be made of fire-retardant material and stored in buoyant containers
What is the meaning of this symbol ?
Start water-spray
Start air supply
Lower lifeboat to water
Embarkation ladder
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?
Ensuring that a sufficient supply of water is brought to the survival crafts.
Ensuring that the passengers' thermal protective aids is brought to the survival craft.
Seeing that the passengers are suitable clad.
Ensuring that a supply of food is brought to the survival crafts.
*How much food per person is supplied on a liferaft marked SOLAS B PACK?
Not less than 10000 kJ
Not less than 5000 kJ
None
Not less than 20000 kJ
Give the meaning of the following symbol
Survival craft portable radio
Survival craft distress pyrotechnic signals
EPIRB
Radar transponder
What is the meaning of this symbol ?
Child's lifejacket
Lifebuoy
Immersion suit
Lifejacket
During a helicopter evacuation, the helicopter lowers his winch wire to the deck. Which of the following should NOT be done with the winch wire?
Secure it to a strong point on deck
Touch the wire with bare hands
Secure it to the deck with a weak link
All of the mentioned actions
When muster to a lifeboat drill, what is the first thing you do when entering the muster station?
Report your presence.
Wait for orders.
Put on your life jacket.
Wait for the order to put on your life jacket.
*Which one of the following items has to be included in an abandon ship drill?
Starting and operating radio life-saving appliances
starting and operating the lifeboat engine
Manoeuvring the lifeboat in the water
Launching and recovery of a survival craft
The responsibility for safety and security rests with everybody on board the vessel. General house-keeping rules should be followed. Which of the listed rules is the most important?
Always use gloves when using grinding machines.
Do not use loose garments, belts, ties or scarfs near winches and moving machinery.
Always use protective working shoes when working outdoors.
Always use gloves when handling nylon ropes.
Which of the following precautions should be taken when work is to be carried out on the radar scanner unit on the mast?
Only the electrical fuses for the radar undergoing repairs needs to be removed, allowing the ship to retain a workable radar
Only the electrical fuses for the scanner motor needs to be removed.
A "Not to be used" sign on all radars and fuses for the complete radar systems to be removed
A sign needs to be attached to all the radars warning the bridge officers of repairs and the fact the radars are "Not to be Used"
If an inhibitor is added to an oil cargo, which of the following is a summary list of items to be included on its accompanying certificate?
Inhibitor name; amount added; date added; period of efficiency; precautions if voyage length exceeds that period; eventual temperature limitation.
Inhibitor class; amount added; date of expiry; minimum period of optimum efficiency; precautions to be taken when added; minimum temperature requirement.
Inhibitor class; percentage blended; date added; maximum period of efficiency and applicable temperature limits; maximum storage period on board; contact number of manufacturer.
Inhibitor name; percentage applied; date of expiry; precautions to be taken on voyage and interval of application; maximum temperature at which continuously effective.
What is the correct definition of: - a mooring line?
A line for a block.
A line for the ancher.
A loop in a rope.
A thick rope to tie up the ship.
What is the main advantage of having a central cooling system fitted on board ship?
It should require less maintenance than a conventional system using only sea water.
It does not require any seawater.
It is a simple system with minimum control requirements.
Only one heat exchanger is needed for all cooling duties.
When is a vessel deemed to be cargo worthy?
When the hatch covers and/or hatch pontoons are weather tight
When the vessel’s Safety Construction Certificate is valid
When the hatch covers and/or hatch pontoons are watertight
When all her certificates are in order
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
At what number of crew members is it mandatory to have an Working Environment Committee on board?
Minimum four crew members.
Not mandatory.
Minimum eight crew members.
Minimum twelve crew members.
The speed of ship's generator is regulated by the governor. A 10% reduction in generator speed occurs due to a faulty governor. The likely consequence for all motors powered from this generator is to:
Increase motor speed by about 10%
Reduce motor volt drop by about 10%
Increase motor power by about 10%
Reduce motor speed by about 10%
Which of these is not covered in the chain register?
Deck cranes
The engine room gantry crane
Derricks
The gangway winch
What are the three volumes of the IAMSAR Manual?
I Organization and Management II Mission Co-ordination III Mobile Facilities.
I Planning and Preparation II Rescue Control III Reference
A Command and Control B Communications C Rescue Procedures
I Organization II Communications III Rescue Procedures
Some of the valves in the system are marked ESD. What does this mean?
Emergency safety drop.
Estimated shut down.
Emergency shut down.
Estimated safety drop.
What is the meaning of instrument calibration
Comparing input and output values against a documented standard
Comparing two instruments of the same type
Turning gauge too an easy reading position
Adjusting size to fit process connection
What requires close attention during portable car deck inspections?
Safety markings
Load density markings
Abrasions over the decks' surfaces
Signs of cracks in way of deck supports
What would you suspect has happened if the lubricating oil for an air compressor has a milky white appearance?
Water contamination of the oil.
Wrong grade of oil has been used.
Oil temperature has been too high.
Air contamination of the oil.
Which of the following kinds of fish is the least perishable in cold storage?
Herring
Salmon
Halibut
King klip
If a vessel’s Longitudinal Centre of Floatation (LCF) is 60.582 in saltwater, what would be her LCF is water of density 1.015 T/m3?
60.582m
61.178m
63.027m
59.99m
On some large slow speed engines the crosshead guides are adjustable to allow the clearance between the crosshead shoes and the guides to be set equally. The normal arrangement is to have bolted on guide bars with shims fitted behind them. Which of the methods given in the options is the one normally used to ensure this is done correctly?
Fit an equal number of shims behind each guide bar which should result in equal clearances between the guide bars and shoes along the whole length.
Turn the engine so that the piston for the cylinder concerned is at TDC and measure the clearance along the length of each bar and shoe and fit shims to equalise the clearances.
Turn the engine so that the piston for the cylinder concerned is at BDC and measure the clearance along the length of each bar and shoe and fit shims to equalise the clearances.
Turn the engine so that the piston skirt is at the bottom of the liner. Use wedges to centralise the piston and measure the clearances along the length of each bar and fit shims to equalise the clearances.
What would be the most likely cause of a smell of "rotten eggs" in the upper casing of the engine room?
Fresh water evaparator malfunction.
Open or leaking acetylene bottle.
A leak of exhaust gas from a boiler or diesel engine exhaust.
Failure of the ship's refrigeration system.
What is the correct way that the lookout should report the appearance of a light, in clear visibility, on the port side of the ship in a direction half way between right ahead and abeam?
The lookout should state "Light on the port bow"
The lookout should state "Ship observed 45 degrees to port"
The lookout should state "Ship seen to port"
The lookout should state "Light 4 points to port"
At what time should lashings be released?
The crew can release lashings prior to arrival to avoid any delays.
As soon as the weather conditions are favourable, lashings can be released.
Lashings should be released when the ship enters enclosed waters.
Lashings should not be released for unloading before the ship is secured at the berth, without the Master's express permission.
How is stability affected during Parametric Rolling?
By a virtual loss of GM
By development of a negative GM
By rapidly changing waterplane areas
By heaving rolling and pitching
Which of the following food types are good sources of polyunsaturated and monosaturated fatty acids?
Meat products, such as pies, re-formed joints and burgers
Fish, nuts and vegetables
Sugar, chocolate and pectin
Full fat dairy products
What is the main fire fighting medium for tank deck on gas and chemical carriers?
There is not any main medium for tank deck fire fighting on gas and chemical carriers
Foam is the main medium for tank deck fire fighting on gas and chemical carriers
Freshwater is the main medium for tank deck fire fighting on gas and chemical carriers
Chemical powder is the main medium for tank deck fire fighting on gas and chemical carriers
The majority of conversions adopted under the auspices of IMO fall into which of the three main categories:
don't know
Maritime Safety, Prevention of Marine pollution, Liability and compensation
Maritime Safety, STCW, Maritime Security
Safety, Terrorism, ILO
Where is the "WINDLASS", in the figure?
The Windlass is inidcated by D, in the figure
The Windlass is inidcated by B, in the figure
The Windlass is inidcated by A, in the figure
The Windlass is inidcated by C, in the figure
How is damage to the piston rod stuffing box rings avoided when removing and replacing the piston during overhaul of the piston of a large two stroke diesel engine?
A tapered guide sleeve should be fitted over the threaded end of the piston rod.
The piston rod gland should always be removed from the engine before the piston is lifted out to avoid damage to the rings.
The lower part of the piston rod is wrapped in rags.
The piston rod nut is put on during removal and refitting of the piston through the gland.
What is a "colander" used for?
To drain the water off food.
To stir foods during cooking.
To hold different foods together during barbequeing.
To test the temperature of food during cooking.
If a cargo leak occurs onboard a liquefied gas carrier it is likely that a 'white' vapour cloud will form. What makes the vapour cloud look white?
Condensation of nitrogen in the air.
Condensation of cargo vapour in the air.
Condensation of oxygen in the air.
Condensation of water vapour in the air.
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.
When it is required that a mandatory prewash is to be witnessed, who is to make and sign the applicable entries in the Cargo Record Book?
The Master
A government-authorized surveyor.
x
A mechanical seal, consisting of carbon and ceramic seal rings, is to be fitted to a cetrifugal pump shaft. What is the most likely result of not being extremely carefull when fitting this type of seal?
The spring and bellows for the seal can be easily damaged.
The rubber O rings for the seal can be easily damaged.
The seal rings are brittle and can be easily chipped or damaged.
The seal rings are hard and may score the pump shaft.
What is the direction of wind associated with an anticyclone (area of high pressure) in the Northern Hemisphere?
Clockwise around the high pressure
Straight towards the centre of the anticyclone
Directly away from the centre of the anticyclone towards the nearest Low pressure.
Anticlockwise around the high pressure
A bulk carrier is about to commence loading steel coils using ships cranes, what three important checks must be made?
Cabs cleaned and lighted, drivers regularly rested
Crane windows cleaned,cab heater on and no- smoking rule enforced
Crane controls tested, limit switches correctly set and SWL never to be exceeded
Planned maintenance completed, all paintwork in good condition and lighting checked
Liquefied gas is, by IMO, divided into different groups. What is the criterion for this division?
The boiling point, chemical bindings, toxicity and flammability.
The gas pressure.
The hydrocarbon and nitrogen content.
The hydrate formation.
According to the IBC Code, the master of a chemical tanker must be supplied with a loading and stability information booklet. What must this booklet contain?
Summary details of light ship and fully loaded conditions and of a representative part-loaded condition, with examples of calculations of typical pre-departure stability conditions and an example of a damage stability calculation to enable the master to determine survival capability in the event of an emergency involving a breach of the hull.
Details of service and ballast conditions for loading based on the range of products which a vessel is certified to carry, incorporating the maximum permissible DWT, the maximum permissible SG of any product, the maximum permissible trim and any structural constraints that will impact a loading condition.
Certificates confirming the testing and calibration of tank gauging equipment, the ship's stability computer program and the accuracy of draft and loadline marks.
Details of typical service and ballast conditions, provisions for evaluating other conditions of loading and a summary of the ship's survival capabilities, together with sufficient information to enable the master to load and operate the ship in a safe and seaworthy manner.
Why are all passenger ships divided into vertical ’zones’?
Vertical zones are separated with fire doors which will be closed automatically when the fire alarm start.
All vertical zones are separated with watertight doors, which will be closed in the case of a grounding, etc.
Vertical zones are fire zones which can be divided from each other with fire doors. In case of fire, all fire doors in front and aft of the fire will be closed to prevent spreading of smoke/fire.
There is one fire team in each zone.
How might a leak from a cargo tank on an oil tanker be readily detected during the voyage?
By regularly monitoring the vessel's trim on the cargo computer - any cargo that leaks will run to the end of a compartment, resulting in an increase in trim.
By occasionally opening a selected tank and manually measuring the cargo ullage, then comparing it to the 'after loading' reading.
By regularly monitoring void and ballast spaces, such as by testing them for hydrocarbon content and sounding them.
By frequently monitoring cargo level equipment readouts and comparing them to the load port departure readings.
The International Maritime Bureau Piracy Reporting Centre attributes the increased numbers of hijackings to:
Higher crime rates around the world.
The greater involvement in piracy of well-organized and armed crime networks.
More crew involvement.
Easy access to military weapons.
You enter a high voltage switchroom and smell rotten eggs. What may this indicate?
Problems with a vacuum circuit breaker
Arcing at badly coupled bus bars
Problems with a gas (SF6) circuit breaker
Burning of insulation
Prior to loading general cargo what must be ensured with regard to lashing wires, terminations, shackles, turnbuckles, pad eyes and D rings?
They must all be visually inspected
They must all be certified and be (visually) unimpaired
Lashing wires must be new whereas other accessories may be certified
They must all be certified
What is a "hot work permit"?
A list maintained by the Chief Engineer on which are the names of those crew members who are qualified to operate the ship's welding equipment.
A document issued by an authorised person, permitting specified work to done for specified time in a defined area, employing tools and equipment which could cause the ignition of flammable gases.
A document issued by a shipyard chemist authorising shipyard employees to board a vessel for the purposes of structural repairs.
A document completed by a ship's officer, authorising entry into an enclosed space for the purpose of welding, cutting and grinding.
On a RoRo vessel, which of these stowage situations produces high friction that does not allow movement of the cargo?
A single tier of dunnage placed between vehicles and steel decks
Steel plates placed between vehicles and steel decks
Vehicles in direct contact with steel decks
Two tiers of dunnage placed between vehicles and steel decks
When carrying fishmeal without anti-oxidant which of the following stowage patterns is recommended under the IMDG Code?
The block stow with extensive internal channelling
The double strip stow with extensive athwartships channelling
The block stow with no internal channelling
The compact stow with limited channelling
You have just completed the discharge of a cargo of Lube Oil additive and are clearing the ship's lines to shore. What piece of equipment can be fitted between a drain cock and the air line to safely release any excess pressure before disconnecting the air line?
An expansion valve.
A reducer.
A quick-coupling.
A three-way valve.
Which push-button valve A, B or C must be pushed (operated) in order to obtain movement of the pneumatic cylinder S?
A
B
None
C
Special "additives" are sometimes blended with, or added to, chemical cargoes to prevent polymerisation, decomposition or oxydation while they are in the ship's tank on a long voyage. What general term is given to these additives?
Inhibitors.
Preventors.
Activators.
Limiters.
On a RoRo vessel, what is the Maximum Securing Load of web lashings?
60% of the breaking strength
65% of the breaking strength
50% of the breaking strength
Why is it necessary to use the vacuum pump after major overhaul of the reefer system?
In order to reduce the pressure in the system before start-up.
Not necessary.
To evacuate air and water out of the system in order to prevent problem during operation.
To make underpressure in the reefer system in order to get the freon liquid easy back to the system.
On a RoRo vessel, what must you ensure where the cap of a sounding pipe is flush with a ro-ro deck?
Sufficient vertical clearances between the sounding pipe cap and cargo lashings
Prohibit all cargo stowage around this area
Prohibit the stowage of general cargo around the area
Prohibit the stowage of wheeled cargo around the area
Which of these definitions is that of a "Marine Pollutant" under the IMDG Code?
Any substance which is deemed hazardous to the marine environment.
A substance which is subject to the provisions of Annex III of MARPOL 73/78, as amended.
A substance which, because of its tendency to degrade in seafood, or because of its hazard potential to the aquatic environment is subject to the provisions of Annex I of MARPOL 73/78, as amended, and carried by sea accordingly.
A substance which is subject to the provisions of Chapter V of SOLAS 1974, as amended.
You have just started to load Dicyclopentadiene to 5 port and starboard cargo tanks, but no cargo seems to be coming into the tanks. What will you do?
Carefully slack the bolts back on the connections, working initially on the off-shore mainifold, to determine how far the pressure extends in the ship's pipeline system, to identify which valve is giving the problem.
Stop cargo - notify the Duty Officer and / or the terminal dependng on the agreed communication procedure. Re-check the lines, valves and connections carefully, bearing in mind that there might be a build-up of pressure. Report as appropriate.
Open the main lid on the tank and use a flashlight to try and see if there is a problem with the pump or line inside.
Say nothing. Re-check all valves. Just open it, if one is found closed.
What is the approximately efficiency of the ejector?
The ejector's efficiency is between 20% and 30%.
The ejector's efficiency is between 30% and 40%.
The ejector's efficiency is between 70% and 80%.
The ejector's efficiency is between 60% and 70%.
On a Container vessel, what must be done when container lashing equipment fails at sea?
Report the matter to the equipment manufacturer's
Report the matter to the ship owner
Enter the number and type of failed equipment in the deck log book
Enter the number and type of failed equipment into the lashing equipment file on board
What is the main reason for sometimes having a separate forced lubrication system for the camshaft on large cross head engines?
To prevent the camshaft system being contaminated with any water leaking into the main lubrication system from faulty cylinder liner seals.
Because the camshaft lubrication system has a lower pressure than the main lubrication system.
To prevent any fuel leakage from the high pressure fuel pumps contaminating the oil in the main lubrication system.
Because the camshaft system uses a different grade oil from that used in the main lubrication system.
What to do if Your ship receive HFO with high density, from the last bunkering, to obtain the best purifying result?
According to the nomograms You select a gravity disc with larger hole diameter.
This make no difference for the result.
Increase the speed of the purifier (RPM).
You start the purifier with a smaller disc.
Which component does this graphical symbol illustrate?
Pressure relief valve, self-contained
Pressure indicator, installed locally
PH analyzer
Pressure indicator, installed on panel/console
What is an A/D and a D/A converter?
A converter that converts alternating current into direct current and vice versa.
An amplifier for direct current.
A converter that converts an analogue signal to a digital signal and vice versa.
A converter stabilising the voltage.
If diesel fuel contamination occurs in the crankcase oil of an auxiliary engine, the oil viscosity will:
Nothing happens.
Increase.
Stay the same.
Decrease.
If the temperature decrease, what will happen with the interface in the bowl ?
Broken water seal, oil outside the top disc.
Decreasing of capacity.
Will have no effect on interface.
Interface towards center.
What would be the most probable cause of a drop in lubricating oil pressure?
Lub oil cooler is clogged.
Charge air cooler is clogged.
Jacket water cooler is clogged.
Exhaust manifold is clogged.
What is the reason too rising cooling water temperature at outlet of individual cylinders?
Compression pressure too low.
Overload of the engine.
Cooling water spaces insufficiently vented.
Fuel pressure of fuel booster pump too high.
With the compensating needle screw of a Woodward regulator is closed, what will happen when the load is changing?
Woodward regulator will regulate normally
Woodward regulator will not regulate at all
Woodward regulator will regulate very slowly
Woodward regulator will regulate very fast
What is the meaning of the term "valve clearance"?
The clearance between valve spindle disc and seat.
The clearance between the rocker arm and camshaft pushrod.
The clearance between the rocker arm and valve pushrod.
The clearance between the rocker arm and valve pushrod in either warm or cold state.
This online test consists of 90 random questions from CES 5.1 tests on a topic of your choice.