C1
Which steam plant watch operating condition will require priority attention over the other conditions listed?
High level main condenser
High level lube oil storage tank
Deareating tank pressure 2 psig above normal
Low water level main boiler
The watch engineer finds the refrigeration compressor has blown the shaft seal. In this situation, he should __________
Tighten the shaft seal packing to reduce leakage, slow the compressor, and operate the expansion valves by hand until repairs can be made
Secure the compressor at once and close the suction and discharge valves
Pump the system down and isolate the leak
Close the suction valve, secure the compressor, and then replace the shaft seal
What is the proper way of storing an oxygen and acetylene cylinders
Upright with the cylinder caps off
Upright with the cylinder caps screwed on
Horizontal with the cylinder caps screwed on
Horizontal with the cylinder caps off
What is the main reason that live auxiliary steam is normally attemporated before entering the feed heater of a flash evaporator?
To increase the brine overboard density
To reduce the rate of scale formation on heating surfaces
To increase the pressure in the heat exchanger
To increase the pressure in the first stage flash chamber
If the temperature in a hot air manifold were found to be 122oF, what will be the equivalent reading on the centigrade scale?
35°C
40°C
50°C
45°C
Which of the listed fuel oil ignition methods are commonly found on automatically fired auxiliary boilers aboard merchant vessels?
A gas pilot light
A high energy electric spark
A manually‐operated friction igniter
An incandescent glow plug
What maybe the cause of injection lag in a diesel engine?
A higher cetane number of fuel oil
Mechanical rigidity in the lube pump mechanism
The diesel fuel used having a high viscosity
A decrease in the fuel pump delivery pressure
A lube oil filter can be used to remove most contaminants from lube oil. What contaminant will remain in the lube oil after filtering?
Fuel/Diesel oil
Acid
Sediment
Water
Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. What is the governor characteristic used to accomplish this?
Promptness
Sensitivity
Actuation
Compensation
What might be the cause of excessive vibration of an automatically fired auxiliary boiler?
Air or water in the furnace
Combustion pulses
Flame failure
Fuel oil pump failure
A pneumercator is an instrument used to indicate _____.
Air pressure in the diesel engine starting circui
Phosphates in boiler water
Tank fluid level
Micro ohms in condensate
What reading will be obtained if we use a dry uncoated sounding rod or tape to measure the depth of water in a reserve feed water tank?
Very inaccurate
Always be 100% accurate
Thoroughly contaminate the feed water
Be satisfactory if a small amount of oil is floating on the surface
If the temperature in a hot air manifold were found to be 122oF, what will be the equivalent reading on the centigrade scale?
35°C
50°C
40°C
45°C
Which of the listed fuel oil ignition methods are commonly found on automatically fired auxiliary boilers aboard merchant vessels?
A gas pilot light
A high energy electric spark
An incandescent glow plug
A manually‐operated friction igniter
What maybe the cause of injection lag in a diesel engine?
Mechanical rigidity in the lube pump mechanism
The diesel fuel used having a high viscosity
A decrease in the fuel pump delivery pressure
A higher cetane number of fuel oil
A lube oil filter can be used to remove most contaminants from lube oil. What contaminant will remain in the lube oil after filtering?
Fuel/Diesel oil
Acid
Sediment
Water
Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. What is the governor characteristic used to accomplish this?
Sensitivity
Compensation
Actuation
Promptness
What might be the cause of excessive vibration of an automatically fired auxiliary boiler?
Combustion pulses
Air or water in the furnace
Fuel oil pump failure
Flame failure
A pneumercator is an instrument used to indicate _
Air pressure in the diesel engine starting circuit
Tank fluid level
Phosphates in boiler water
Micro ohms in condensate
Where is the contaminated oil enters the centrifuge in a disk type centrifugal purifier?
At the bottom through the oil inlet
Through the neck of the top disk
Through the funnel body
At the top through the regulating tube
Why is condensate being pumped from the condenser to the DC heater instead of directly to the boiler
Boiler feed pumps must operate with a negative suction head
Condensate should be deaerated before entering the boiler
Suspended solids in the condensate must be eliminated
Condensate at condensing temperature is too hot and will cause thermal stress in the boiler
The device most commonly used to measure the exhaust gas temperature of a diesel engine cylinder is called a ___
Pyrometer
Calorimeter
Dynamometer
Achometer
Exhaust valve grooving and corrosion is caused by certain components of residual fuel oil. These components are sodium, sulfur, and ______
Carbon
Vanadium
Copper
Ash
What reading will be obtained if we use a dry uncoated sounding rod or tape to measure the depth of water in a reserve feed water tank?
Be satisfactory if a small amount of oil is floating on the surface
Always be 100% accurate
Thoroughly contaminate the feed water
Very inaccurate
A dirty atomizer sprayer plate in the burner of an auxiliary boiler, would be indicated by ___
A dazzling white atomizer flame
Carbon on the register doors
An unevenly shaped burner flame
Fluctuating pressure in the windbox
Why do most temperature control valves in diesel engine closed freshwater cooling systems bypass the flow of jacket water around the cooler instead of around the engine?
Excessive cooling would take place in the heat exchangers at high loads
Changing the rate of flow in the jackets could cause localized hot spots
Emergency hand control would not be possible if water flow through the jackets were controlledemergency hand control would not be possible if water flow through the jackets were controlled
Excessive cavitation erosion would take place in the coolers
A pyrometer is capable of producing a voltage by _
Light striking a photo sensitive substance
Squeezing crystals of certain substances
Heating a junction of two dissimilar metals
Chemical reaction
The DC heater functions to ___
Ensure recirculation in the feedwater system
Store, heat, and deaeratefeedwater
Chemically treat feedwater to remove carbonic gas
Remove the major amount of noncondensable gases from the main condenser
Excessive lubricating oil consumption in a running diesel engine can be caused by __
Excessive valve‐guide clearance
Clogged lube oil piping
High lube oil viscosity
Low lube oil temperature
Increasing the valve clearance between a valve stem and rocker arm, will in the valve _____
Closing later
Staying open for a shorter period of time
Opening sooner
Staying open for a longer period of time
Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by ___
Worn valve guides
Collapsed hydraulic valve lifters
Excessive crankcase vacuum
Excessive lube oil pressure
Valve lash, or clearance refers to the ___
Clearance between the valve seat inserts and the valve head
Fuel injection cam profile
Clearance between the top of the valve stem and the rocker arm
Compression force of the valve springs
Crank web deflection readings will give a positive indication of ______
Crankpin misalignment
Slack thrust bearings
Bearing shells shim dimension
Worn main bearing journals
Cooling water pumps driven by direct‐reversing diesel engines are usually ___
Curved impeller vane with tangential outle
Straight impeller vane with concentric housing
Curved impeller vane with concentric outlet
Straight impeller vane with tangential housing
Rapidly discharging condensate into the DC heater during normal steaming conditions could cause
Decrease in auxiliary exhaust pressure
Decrease in dissolved oxygen in the feedwater
Water hammer in the economizer
Increase in auxiliary exhaust pressure
Most large main propulsion diesel engines use a duplex lube oil strainer to _______
Decrease the time required between cleanings
Ensure that all lube oil has been treated twice
Ensure a positive flow of oil at all times
Remove all large and small foreign objects
Throttling a burner air register on an auxiliary boiler could result in _____
Smoky boiler operation
Decreased fuel consumption
Improved fuel combustion
Fewer soot deposits
Which of the following problems can cause fluctuating pressure in the closed cooling system of a main propulsion diesel engine?
Defective temperature controls in the system
Cavitation in the cooling water pum
Opened vent in the cooling system
Restricted water passages in the engine
9 The effective stroke of a constant‐stroke, individual, fuel injection pump is varied by the
Delivery valve
Governor speed
Control rack
Plunger crossbar
The minimum design height of the DC heater is determined by the ____
Desuperheter outlet temperature
Dew point temperature of the stack gases
Maximum condensate pump discharge pressure
Minimum net positive suction head required by the main feedpump
1 You are operating a main propulsion diesel engine at a constant load when the jacket temperature begins to rise. This could be caused by ____
Dirty fuel oil filter
Fuel oil being too heavy (viscous)
A piston about to seize
High water level in the expansion tank
The bulk of the solid material entering a centrifugal purifier with lube oil is ____
Trapped in the bowl
Trapped in the filter
Discharged with the water
Forced out the overflow
The DC heater automatic level dump valve is used to _____.
Divert the flow of condensate from the first stage heater to the vent condenser
Drain excess feedwater to the distilled water tank
Maintain a proper condensate level in the condenser hotwell
Recirculate condensate to the atmospheric drain tank
While at sea, the flash type evaporator is discharging the output to the distill tanks. If it becomes necessary to reduce the feed water temperature below 165oF, you should ___
Dump the evaporator to the bilge
Secure the evaporator until the feedwater temperature can be raised to 165oF or more
Continue the current evaporator operation
Raise the tripping point at the salinity indicating panel for the three‐way valve
Exhaust pyrometer readings provide an indication of the __
Effectiveness of water‐cooled exhaust elbow
Amount of fuel penetration into the engine cylinders
Distribution of the load between engine cylinder
Indicated horsepower of the engine cylinders
Fuel combustion in a diesel engine cylinder should begin just before the piston reaches top dead center and should _______
End when fuel injection has been completed
Continue through the after‐burning period
End at bottom dead center
Be completed exactly at top dead center
Which of the filters listed will deplete the additives in lubricating oil?
Cloth bag extractor
Extended area membrane filter
Adsorbent filter
8A change in engine speed is required before a governor is able to make a corrective movement of fuel rack. This aspect of governing is commonly expressed as a percent and is known as
Governor sensitivity
Governor promptness
Speed droop
Isochronous governing
Reducing the clearance between a valve stem and rocker arm will result in the valve ____
Having a shorter duration of opening
Opening later
Closing sooner
Having a longer duration of opening
Diesel engine injection lag is caused by ______
High fuel oil supply flow
Low cetane value of the fuel
Compressibility of the fuel
Excessive air turbulence
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