C5
1 The ability of lubricating oil to resist viscosity changes during temperature changes is indicated by the________.
American Petroleum Institute number
Viscosity index number
Seconds Saybolt Furol number
Seconds Saybolt Universal number
2 If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the _____ .
Packing gland
Mechanical seals
Lantern rings
Wear rings
3When securing a distillate pump on a low pressure fresh water evaporator, which of the listed steps should be carried out first?
Stop the pump
Close the pressure gage valves
Trip the three‐way solenoid dump valve
Close the sealing line valves to the pump
4A hydraulic system gear pump being fed from a reservoir frequently indicates signs of excessive pitting after two months of service. Which of the following would most likely contribute to this condition?
Abnormal pressurization is occurring in the reservoir
A partial restriction in the return line has developed
Operating oil temperature is determined to be below normal
A vacuum condition has developed in the reservoir
5 The minimum delivery pressure required for diesel engine fuel oil injection depends primarily on the ___________.
Degree of cylinder air turbulence
Firing pressure in the engine
Compression ratio of the engine
Duration of the combustion period
6 Fuel oil penetration into the cylinder of a diesel engine is ___________.
Dependent on fuel injection cut‐off
Reduced by finer atomization
Increase by finer atomization
Nonexistent in the precombustion chamber system
7Which of the following precautions should be observed concerning the introduction of a fire resistant fluid into a hydraulic system
Fluid viscosity always increases as a normal result of its use.
Decreased wear rates of components is an advantage of its use
Deterioration of paints, seals, metals, and electrical insulation may occur.
Only chemically active filters may be used.
8A good quality oil used in main propulsion engine lubrication systems should be _____________.
Free from all chemical additives
Resistant to permanent emulsification
Quickly chemically oxidized
Readily saponified with water
9 Fuel supplied by each unit injector on a two‐stroke/cycle single acting diesel engine is directed into each cylinder at a very high pressure through the ___________.
Spray tip of the injector
High pressure fuel line
Spill deflector
Check valve
10Very small irregularities on the seat and disk of a globe valve may be manually repaired with the valve in place by the process known as _____________.
Honing
Lapping in
Refacing
Spotting in
11When assembling a run of liquid service piping, which of the following factors should be considered? I. How the type of fittings used will affect the flow II. What type of gasket material should be used III. What radius should be used for each bend in the
I only
I & II
II & III
I, II & III
12 The injection pressure of a hydraulic fuel injection nozzle can be increased by _______.
Increasing fuel oil booster pump pressure
Increasing compression on the pressure spring
Increasing the injector nozzle orifice size
Removing shims from under the nozzle spring
13 Zinc anodes are installed in a marine raw‐water cooling system to _____________.
Inhibit oxidation
Prevent scaling
Control electrolysis
Eliminate corrosion
14 To correctly identifies the position of the journal when the shaft is ______.
Just at the moment prior to being stopped
Increasing its speed to required operating speed
Operating at its normal operating speed
Just beginning to rotate
15A hydraulic system gear pump being fed from a reservoir frequently indicates signs of excessive pitting after two months of service. Which of the following would most likely contribute to this condition?
A vacuum condition has developed in the reservoir
Abnormal pressurization is occurring in the reservoir
A partial restriction in the return line has developed
Operating oil temperature is determined to be below normal
16 The minimum delivery pressure required for diesel engine fuel oil injection depends primarily on the ___________.
Degree of cylinder air turbulence
Firing pressure in the engine
Compression ratio of the engine
Duration of the combustion period
17 Fuel oil penetration into the cylinder of a diesel engine is ___________.
Dependent on fuel injection cut‐off
Increase by finer atomization
Nonexistent in the precombustion chamber system
Reduced by finer atomization
18Which of the following precautions should be observed concerning the introduction of a fire resistant fluid into a hydraulic system?
Deterioration of paints, seals, metals, and electrical insulation may occur.
Fluid viscosity always increases as a normal result of its use.
Decreased wear rates of components is an advantage of its use.
Only chemically active filters may be used.
19A good quality oil used in main propulsion engine lubrication systems should be _____________.
Free from all chemical additives
Resistant to permanent emulsification
Quickly chemically oxidized
Readily saponified with water
20 Fuel supplied by each unit injector on a two‐stroke/cycle single acting diesel engine is directed into each cylinder at a very high pressure through the ___________.
High pressure fuel line
Spray tip of the injector
Spill deflector
Check valve
21Very small irregularities on the seat and disk of a globe valve may be manually repaired with the valve in place by the process known as _____________.
Honing
Lapping in
Refacing
Spotting in
22 The injection pressure of a hydraulic fuel injection nozzle can be increased by _______.
Increasing fuel oil booster pump pressure
Increasing the injector nozzle orifice size
Removing shims from under the nozzle spring
Increasing compression on the pressure spring
23 Zinc anodes are installed in a marine raw‐water cooling system to _____________.
Inhibit oxidation
Control electrolysis
Prevent scaling
Eliminate corrosion
24Main propulsion engine lube oil sumps should be constructed _________.
So as to never be integral with the main engine foundation
Only of nonferrous, noncorrosive metals
With drain/return lines terminating just above or at the designed normal level
With a sloped bottom
25 The amount of fuel injected into a diesel engine cylinder by a unit injector, is controlled by
A metering helix inside the pump
The firing pressure in the cylinder
Varying the physical length of the plunger stroke
Varying the clearance between the injector cam and the injector rocker arm
26Gate valves should not be used for throttling as __________.
The pressure drop will be excessive
Wire drawing of the disc will result
Air binding will develop
The installation of an equalizing line will be necessary
27 If the chemical analysis of a lube oil sample taken from the main propulsion machinery indicates an increased neutralization number the _______.
Viscosity has decreased
Demulsibility has improved
Acidity has increased
Foaming is guaranteed to occur
28Assuming oil and water flow rates remain the same, what would be the effect of scale formation occurring on the inside of the cooling water tubes of a lube oil heat exchanger?
Water temperature outlet temperature will decrease and the lube oil temperature will decrease
Water temperature outlet temperature will increase and the lube oil temperature will decrease
Water temperature outlet temperature will increase and the lube oil temperature will increase
Water temperature outlet temperature will decrease and the lube oil temperature will increase
29 The combustible element in fuel that could cause major air pollution is _______.
Hydrogen
Nitrogen
Carbon
Sulphur
30 The viscosity of fuel oil is indicated by its____________.
Weight
Internal friction
Demulsibility
S.A.E. number
31 The final heating of the feedwater in a flash type distilling plant is carried out by______.
Heat exchange in the first‐ stage feedbox
Low pressure steam admitted to the feedwater heater
Vaporization in the first‐ stage flash chamber
Heat exchange in each stage distiller condenser
32Which of the listed conditions can lead to cavitation in a centrifugal pump?
Rough casing volute surfaces.
Worn wearing rings.
Vapor pockets formed in the suction flow stream.
Heavy fluid in the flow stream.
33 If you attempt to tighten a leaking hydraulic fitting with pressure on the system, you will _____.
Be successful every time
Cause the system to vibrate
Dislodge any scale in the tubing, and it will damage the system
Find that the pressure will prevent the components from being tightened
34 To correctly identifies the position of the journal when the shaft is ______.
Just at the moment prior to being stopped
Just beginning to rotate
Increasing its speed to required operating speed
Operating at its normal operating speed
35 Tube scaling in heat exchangers causes the heat transfer rate to decrease because the _____.
Surface area of the tube decreases
Cooling fluid outlet temperature decreases
Thermal conductivity of the scale is very low
Flow through the heat exchanger becomes more turbulent
36While the oily‐water seperator is operating in the processing mode, if a low vacuum, what is the probable cause?
The bilge suction is completely flooded.
The coalescer beads are severely fouled.
The flow control valve 14 is completely open.
There is minor air leakage into the separator.
37 The harmful effect of sulfur present in the boiler fuel oil is that it ___________.
Causes excessive smoke and soot when firing at low rates
Forms corrosive acids when mixed with water
Does not readily burn when mixed with oxygen
Frequently clogs fuel strainers
38What do next after adding grease to a ball bearing with a hand held grease gun?
Run the machine with the bearing housing drain plug open for a short while
Close the bearing housing drain and add a little extra grease to compensate for air pockets in the bearing
Remove the grease fitting and leave open to allow excess grease to escape
Save the used grease for chemical analysis
39What happen when you heat the oil?
It makes the oil extremely viscous
It makes the oil less viscous
It makes the oil frictionless
It makes the oil difficult to transfer
40What instrument or process determines the BTU value of boiler fuel oil?
Open cup test
Hydrometer
Calorimeter
Viscosimeter
41Greases are generally produced by ____.
Reducing the temperature of an oil below its cloud point to create the gelatinous texture
Saponifying a metal base, to which oil is then added and mixed under controlled temperature
Reducing tallow 50 degrees Fahrenheit below its pour point then mixing a base metal, such as barium, into solution
Saponifying an aluminium base, to which tallow and oil mixed into solution under a controlled temperature
42 If one of the bilge system manifold valves does not properly seat, the__________.
Bilge well aft connected to that valve will siphon its contents to the forward bilge wells
Bilge system will lose vacuum and prevents the other bilges from being pumped out
Bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied
All of the above
43When securing a centrifugal type distillate pump, which of the listed steps should be carried out first?
Close the pressure gage isolation valves.
Trip the three way dump valve.
Secure the casing vapor vent line.
Secure the stuffing box sealing water line.
44Which of the following statements represents the proper relative direction of flow through a globe valve?
Direction of flow through the valve is unimportant.
Direction of flow through the valve depends upon the type of seat design used in the valve
Direction of flow should be from below the seat.
Direction of flow should be from above the seat.
45 In a two stage flash evaporator, heated feedwater is vaporized in the_________.
First and second stage flash chambers
Distiller feedwater heater
First and second stage vapor separators
Feed inlet box
46 In a centrifugal pumps operating with a high suction lift, foot valves are primarily designed to______. .
Give the pump motor, or driver, positive protection when operating in a shutoff condition
Provide a means of supplying sealing fluid for the impeller shaft stuffing box
Afford the pumping system protection against water hammer and surging
Enable the pump and its suction line to remain primed prior to starting the pump
47Which of the following centrifugal pump components converts the liquid velocity to pressure?
Impeller
Electric motor
Eye
Volute
48An oil fog lubrication system is recommended for______.
High speed continuous operation of roller bearings
Low and moderate speed ball bearings
Heavily loaded and high‐ speed ball bearings
Gear shaft bearings
49 The first step when beginning to set the slide valves on a duplex reciprocating pump is to _____ .
Open the relief valve to prevent accidental starting
Center the steam piston in the cylinders
Ensure the balance piston is on the downstroke
Measure the present port openings to ensure reassembly will be the same
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