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75 Cards in this Set
- Front
- Back
Three of the four methods of cooling are forced-air, air-to-air,air-to-liquid. What is the fourth? |
Convection |
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When utilizing forced-air cooling,an air filter must be provided atthe air outlet to remove dust anddirt from the exhaust air. |
False |
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Heat is removed from the airpassing by the heat producingsource in an air-to-air coolingsystem by forcing it through whatcomponent? |
Heat Exchanger |
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Efficiency is increased in an air-to-liquid cooling system by the useof what system component? |
Liquid heat Excahnger |
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What number of basic coolingsystems make up a typical liquidcooling system? |
2 |
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The secondary cooling systemtransfers the heat load from theelectronic equipment to the primarysystem. |
True |
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The Navy uses what number of basicconfigurations of liquid coolingsystems? |
3 |
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Which of the following waterresources is/are used for primarycooling? |
Seawater and chilled water |
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The cooling water for the primarycooling system is either seawateror chilled water. The seawater isfrom the sea and the chilled wateris from what source? |
The ships air conditioning plant |
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When temperature range isconsidered to be critical, whattype of cooling system would mostlikely satisfy this need? |
Type III |
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What type of liquid cooling systemcan satisfactorily be operated whenseawater temperatures reach 95°F? |
Type I |
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In a primary cooling system, flowregulator may be known by whatother term? |
Orifice Plate |
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Open looped seawater systems arealso called one-pass because theseawater flows through the systemonly once. |
True |
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Secondary cooling systems are whichof the following types? |
Closed-loop only |
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Type I cooling systems employ whattype of configuration? |
Two SW/DW heat exchangers of the same design |
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An expansion tank is installed inwhat system to compensate forchanges in coolant volume? |
The distilled water |
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What term best describes aexpansion tank that is locatedabove the highest point in thesecondary system and vented to theatmosphere? |
Gravity tank |
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What term best describes anexpansion tank that requires an aircharge on the tank and is locatedbelow the highest point in thesecondary cooling system? |
Compression tank |
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What definition best describes theword submicron? |
Less than one millionth of a meter |
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The Type II cooling system employswhat configuration? |
1 SW/DW heat exchanger and one standby CW/DW heat exchanger |
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The Type III cooling system employswhat configuration? |
2 SW/DW heat exchangers of the same design |
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In a Type III cooling system, thetwo-way temperature regulatingvalve is used instead of a three-way valve to regulate thetemperature in what systemcomponent(s)? |
The secondary loop |
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Heat exchanger. |
It is constructed to be shell-type andtube-type in which the secondarycoolant flows through the shell, whilethe primary coolant flows through thetubes. |
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Flow regulators. |
It is used to provide a constant flowof coolant through the system. |
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Expansion tank. |
It is used to provide a constant flowof coolant through the system. |
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Seawater strainer. |
It is used in the seawater coolingsystem to remove debris and sea life,which could clog the pressure and flowcontrol devices. |
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Temperature regulating valve. |
It regulates the amount of coolingwater flowing through or bypassing aheat exchanger to maintain a desiredtemperature of distilled water goingto the electronic equipment. |
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Circulating pump. |
It is used to circulate secondarydistilled water. |
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Demineralize. |
It maintains the secondary coolingsystem’s purity. |
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An oxygen analyzer is used tomeasure the amount of dissolvedoxygen in the liquid coolingsystem. The presence of oxygencauses oxidation within the coolingsystem. |
True |
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When inspecting a telltale drain,you discover that it is leaking.What failure does it indicate? |
The tube joint |
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The overall effectiveness of theheat exchanger is determined bycomparing the primary inlettemperature to its outlet pressure.The result of this comparison isbest described by what term? |
Temperature Gradient |
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What is the symbol for temperaturegradient? |
^T |
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The device that is inserted in theheat exchanger’s water box toconcentrate electrolytic action toit vice to the metal of the heatexchanger’s tubes is made of whatmaterial (s)? |
Zincs and Zinc anodes |
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Who is the best qualified person onboard to determine the overallcondition of the cooling system? |
Engineering officer |
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The expansion tank sight glassshould normally read in what range? |
2/3 to 4/5 full |
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The low-level alarm switch isusually set at 20 percent of tankcapacity. The alarm will initiallysound when the distilled waterlevel reaches which of thefollowing levels? |
20% of full |
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What term best describes the wordmakeup water? |
Distilled water |
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When, if ever, may potable water beused in electronic cooling systems? |
Never |
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What is the maximum permissiblechloride that may be used in cooling system water? |
.065 epm |
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What is an indication that theduplex strainer is clogged? |
The pressure reading will reading will be 5 to 10 psi above the clean basket |
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If the pressure drop is less thanthat of a clean basket reading, thebasket may be missing. |
True |
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The three-way temperatureregulating valve is used whereseawater is the primary cooling medium, and the two-way valve isused where chilled water is theprimary cooling medium. |
False |
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The basic operation of both thetwo-way temperature regulatingvalve is the same as the three-waytemperature regulating valve exceptthat the two-way valve has a manualoverride feature. |
False |
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Temperature regulating valvecorrective maintenance consistsonly of visual checks for leaks andcorrosion. |
False |
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Which of the following devices isused to regulate flow in a seawatercooling system? |
The orifice plate |
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Which of the following flowregulators is used to regulate flowin the chilled water system? |
The variable orifice |
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Which of the following deviceswould be used to protect a coolingsystem from over pressurization? |
The equipment-flow regulator |
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What is the function of a typicallow-flow switch? |
To indicate low coolant flow |
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In a venturi-type flowmeter, theflow rate is measured by whatprocess? |
The pressure differential between the two caps |
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Which of the following flowmetersallows visual inspection of thecoolant for entrained air? |
The rotameter-type |
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Operating a circulating pump withinsufficient coolant flow couldcause which of the followingmalfunctions? |
The overheating of the pump and the seizure of the pump |
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What percent of the coolant flowsthrough the demineralizer in onehour? |
5% |
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Which of the followingdemineralizer components is used toremove small particles from thecoolant? |
The submicron filter |
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Which of the followingcontaminations is least likely tooccur in a distilled water andethylene glycol coolant system? |
Bacterial |
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Demineralize performance andcoolant purity is monitored bymeasuring what property of thecoolant? |
Conductivity |
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Scheduled maintenance of ademineralizer consists primarily ofperforming what preventive action? |
Replace the filters and cartridges |
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Which of the following contaminatescould be considered a source ofcontamination for an oxygenanalyzer sensor? |
Oil from your fingers |
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What position on an alarmswitchboard is used for alarmacknowledgement? |
Standby |
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What position on an alarmswitchboard is used to simulate analarm position? |
Test |
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What is the first step in isolatingthe extent of waveguide flooding? |
Secure the cooling system |
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Dew point is best defined by whichof the following statements? |
Temperature at which the vapor begins to deposit as a liquid |
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Compressing air has what effect, ifany, on relative humidity? |
It will increase |
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Type I dehydrator. |
Uses freezing ONLY to dry the air |
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Type II dehydrator. |
Uses adsorption ONLY to dry the air |
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Type III dehydrator. |
Uses a combination of refrigeration and desiccant to dry the air |
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Air compressor. |
Compresses the air |
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What is the normal mode ofoperation of an equipment airdryer? |
By-pass |
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Oil vapor is removed from thecompressed air by which of thefollowing methods? |
By fluid separation |
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It contains a desiccant chambers todry the air. |
dehydrator |
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It controls inlet air to thedehydrator. |
pressure regulator |
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It uses centrifugal force toextract droplets of liquid. |
fluid separator |
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It uses absorption to remove oilvapor. |
fluid seperator |
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It provides the input to thepressure regulator. |
telltale oil filter |
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It discharges oil and water througha muffler. |
telltale oil filter |