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Which of the following best describes a marine boiler ?

Essential components of ship propulsion systems

A device used to generate electricity on a ship

A type of engine used for underwater navigation

A system for purifying seawater on board a vessel

It is a type of marine boiler use in ships and marine vessels it is designated to generate steam by transferring heat through tubes in a shell

Fire tube boiler

Water tube boiler

Electric boiler

Solar boiler

Why is a boiler manholes oval or egg in shape?

To enhance structural strength

Because oval shapes are more aesthetically pleasing

To prevent the escape of steam during operation

To accommodate larger equipment for maintenance and repairs

To reduce manufacturing costs

Which of the following shows a perfect requirement of a good steam boiler

High pressure steam for power generation

Low pressure steam for power generation

Medium pressure steam for power generation

Steam for heating purposes

What does boiler carry over mean?

Transfer of contaminants from water to steam.

Boiler carry over refers to the transportation of excess water in the boiler system.

It is the process of transferring heat from steam to water in a boiler.

Boiler carry over is the release of excessive pressure from the boiler.

It is the phenomenon where the boiler produces steam at a higher temperature than required.

What happens to the level of boiler water as it heats up?

The level of boiler water will increase

The level of boiler water decreases as it heats up.

The level of boiler water remains the same as it heats up.

The level of boiler water fluctuates randomly as it heats up.

The level of boiler water increases initially but then decreases as it continues to heat up.

Why must a boiler be fired slowly after an overhaul?

To prevent thermal shock and damage

To avoid excessive fuel consumption

To reduce the risk of carbon monoxide poisoning

To prevent overheating and potential explosion

What must a safety valve be capable of to prevent a boiler from steam overpressure?

Releasing excess steam

Adjusting the temperature of the steam

Increasing the pressure inside the boiler

Causing a controlled explosion in the boiler

Why should a boiler be purged during a startup?

To avoid backfire or explosion

To prevent the formation of rust inside the boiler

To reduce noise during the startup process

To minimize the risk of electrical malfunction

What is the effect of priming in the piping system?

It may lead to water being carried over with steam

It can cause a decrease in water pressure.

Priming can lead to an increase in pipe corrosion.

It may result in a decrease in steam temperature.

What is a purpose of a deaerator?

To remove dissolve oxygen and carbon dioxide

To increase the concentration of dissolved oxygen and carbon dioxide

To regulate the temperature of the water

To remove impurities such as chlorine and fluoride

To enhance the taste and odor of the water

Why should the condensate temperature be as high as possible?

To decrease the solubility of gasses

To increase the efficiency of the condenser

To reduce the risk of corrosion in the condenser

To improve the heat transfer rate in the condenser

Why do we need to reduce pressure of steam for consumer user?

Because of equipment maximum allowable working pressure

To prevent the steam from becoming too hot and causing burns

To save energy by reducing the amount of steam used

To avoid excessive noise and vibrations caused by high-pressure steam

What is the part of an exhaust gas boiler which removes the carbon build up clinging at the outside of tubes

Soot blower

Carbon scrubber

External cleaner

Residue remover

They are installed at the boiler drum to eliminate the air, wind, filling water in the boiler or during raising the steam what do you call this part?

Purge valve

Air vent valve

Water inlet valve

Steam release valve

How do we eliminate dissolved oxygen and carbon dioxide in feed water

By air separator

By using a vacuum cleaner

By adding more oxygen and carbon dioxide

By filtering the feed water

How do we remove sludge deposits inside the boiler?

By blowdown

Using a vacuum cleaner

Applying a layer of paint over the sludge

Pouring hot water into the boiler to dissolve the sludge

How do you show your understanding on how to remove suspended solid from the surface of the water?

The surface blowoff pipe in the scum valve is to be used

Use a vacuum cleaner to suck out the suspended solids

Install a windmill on the water surface to blow away the solids

Pour oil on the water surface to dissolve the suspended solids

If the water drum is located at the bottom of the boiler and act as the lower reservoir of the water what else is the purpose of water drum

Serves as collecting point for sludge

Provides insulation for the boiler

Regulates the pressure of the water in the boiler

Acts as a storage tank for excess steam

Boiler water drum is at the lower part and steam drum is at the top of the boiler, what is the use of the steam drum?

Generated steam is collected and is separated from water

The steam drum is used to store excess water in case of a sudden increase in demand for steam.

The steam drum is used to cool down the generated steam before it is distributed to different parts of the system.

The steam drum is used to regulate the pressure of the boiler by releasing excess steam.

What is the purpose of the air vent in boiler mounting?

To reduce dissolved gasses

To regulate the temperature of the boiler

To increase the pressure inside the boiler

To prevent water leakage from the boiler

. Why is there a check valve installed in the feed water inlet in the boiler front

To prevent backflow of water

To regulate the water temperature in the boiler

To increase the pressure of the feed water

To prevent overheating of the boiler

Why should the boiler air blowers run for a while after you have close the oil to the burners

To ensure complete combustion of remaining fuel

To prevent overheating of the boiler

To reduce noise pollution from the burners

To save energy by allowing the residual heat to dissipate

In what tube in a water tube boiler, sludge is most likely to collect in?

Downcomer tube

Fire tube

Steam drum

Economizer tube

What is the purpose of deaerator in the boiler feed water system

To remove dissolved gasses from water

To increase the temperature of the water

To add impurities to the water

To reduce the pressure in the boiler

After closing the drain during the blowing procedure of glass water gauge, the water cock is open and the water flow to the top of the glass, then steam cock is open and water flow out and out of the gas turbine, which statement is correct?

The water level is between the water cock connection of the boiler at the bottom of the gauge glass safe to put feed water in to the boiler

The water level is too high and may cause flooding in the boiler.

The blowing procedure is not necessary and can be skipped.

The steam cock should be closed before opening the water cock.

What justifies the varying number of droplets of water in the steam

The quality of the feed water

The temperature of the steam

The size of the steam generator

The amount of pressure applied to the steam

What is a key knowledge engineers possess about steam pressure distribution that others might not know

Pressure drops are inherent at any distribution system

Steam pressure distribution is not affected by temperature

Pressure drops in steam distribution systems are caused by leaks

Steam pressure distribution is constant throughout the system

Why is a separator installed upstream along reducing valve at typical station

To remove any entrained moisture

To prevent backflow of gas

To regulate the pressure of the gas

To filter out impurities in the gas

When you drain out and clear the lines from water, you prevent water hammering can water hammering dangerous?

Yes it can cause pipe burst

Water hammering can lead to increased water pressure

Water hammering can cause damage to plumbing fixtures

Water hammering can result in noisy pipes

Water hammering can create vibrations in the plumbing system

In an auxiliary steam boiler, what specific space should steam traps be installed?

It should be below lowest condensate discharge point of an equipment

Above the highest condensate discharge point of an equipment

Inside the combustion chamber of the boiler

In the steam supply line to the boiler

It is the motion of the working fluid in the evaporating tubes, what is this motion that affect by heat and pressure difference between downcomer and optic riser tubes

Circulation

Vibration

Convection

Friction

How natural circulation in a boiler be accomplished?

The natural convection current is reduce in water due to difference in density resulting in difference in temperature

By using a high-powered fan to create a strong air current within the boiler

By adding chemicals to the water that increase its density and promote circulation

By placing the boiler in a vacuum chamber to eliminate any resistance to natural convection

The following cases are the cause of water level pull out of sight of water gauge except one

Condenser failure

Leak in the water gauge

Blockage in the water pipe

Faulty water level sensor

What are the effect of air leakage in the condenser?

Results in increase back pressure or turbine thermal efficiency will drop

The condenser will become more efficient

Air leakage will improve the performance of the turbine

Air leakage has no effect on the condenser

How turbo generator overspeed trip is being tested?

At no load increase rpm by speed adjuster will trip at 115 percent of normal speed

The overspeed trip is tested by increasing the load on the turbo generator until it reaches 150 percent of its normal capacity.

To test the overspeed trip, the turbo generator is operated at maximum load and the speed adjuster is set to trip at 90 percent of normal speed.

In order to test the overspeed trip, the turbo generator is run continuously for several hours at a time to ensure that the speed adjuster can handle prolonged high-speed operation.

Prior departure warming up is done in a steam turbine, how do you create vacuum in a condenser

Start steam ejector thus evacuating air in the condenser

Use a vacuum cleaner to suck out the air from the condenser

Install a fan in the condenser to blow out the air and create a vacuum

Inject helium gas into the condenser to displace the air and create a vacuum.

The bridge gives you 2 hours notice prior arrival, what arrival procedure executed first

All fall away procedure in reverse order

Check the weather conditions

Notify the captain of the incoming vessel

Prepare the docking area

In throttle governing consequently with increase in centrifugal force, the balls fly apart in gas turbine as a result what happen next?

Axial movement of sleeve followed by activation of lever in turn activates main valve partially close

The balls disintegrate and cause damage to the turbine

The centrifugal force decreases and the turbine slows down

The lever breaks and cannot activate the main valve

In an impulse turbine, steam expands in what part?

Only in the nozzle

Steam expands in the turbine blades

Steam expands in the condenser

Steam expands in the boiler

There is always some steam left in the clearance space from the previous stroke this steam left in clearance space is called __

Caution steam

Residual steam

Lingering steam

Remaining steam

The density of superheated steam is about _____ that the ordinary saturated vapor at corresponding temperature

8 times

1.5 times

10 times

20 times

Why do the blades of impulse turbine is usually spoon in shape

Because it gives more efficient transfer of energy of steam to turbine

The spoon shape reduces the noise produced by the turbine

The spoon shape allows for better cooling of the turbine blades

The spoon shape increases the lifespan of the turbine blades

Radial and axial are 2 types of clearance in steam turbine, what is radial clearance in steam turbine mean?

Clearance at the tip of the rotor and casing

Clearance between the steam and the turbine blades

Clearance between the rotor and the stator

Clearance between the steam inlet and outlet pipes

Why is it necessary to drain out water from steam turbine casing and steam line prior departure

To prevent damage in blades because blades designed to handle steam not water.

To prevent corrosion in the turbine casing and steam line

To reduce the weight of the turbine for easier transportation

To avoid contamination of the steam with impurities from the water

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