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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

When utilizing forced-air cooling,an air filter must be provided atthe air outlet to remove dust anddirt from the exhaust air.

False

Heat is removed from the airpassing by the heat producingsource in an air-to-air coolingsystem by forcing it through whatcomponent?

Heat Exchanger

Efficiency is increased in an air-to-liquid cooling system by the useof what system component?

Liquid heat Excahnger

What number of basic coolingsystems make up a typical liquidcooling system?

2

The secondary cooling systemtransfers the heat load from theelectronic equipment to the primarysystem.

True

The Navy uses what number of basicconfigurations of liquid coolingsystems?

3

Which of the following waterresources is/are used for primarycooling?

Seawater and chilled water

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

When temperature range isconsidered to be critical, whattype of cooling system would mostlikely satisfy this need?

Type III

What type of liquid cooling systemcan satisfactorily be operated whenseawater temperatures reach 95°F?

Type I

In a primary cooling system, flowregulator may be known by whatother term?

Orifice Plate

Open looped seawater systems arealso called one-pass because theseawater flows through the systemonly once.

True

Secondary cooling systems are whichof the following types?

Closed-loop only

Type I cooling systems employ whattype of configuration?

Two SW/DW heat exchangers of the same design

An expansion tank is installed inwhat system to compensate forchanges in coolant volume?

The distilled water

What term best describes aexpansion tank that is locatedabove the highest point in thesecondary system and vented to theatmosphere?

Gravity tank

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

What definition best describes theword submicron?

Less than one millionth of a meter

The Type II cooling system employswhat configuration?

1 SW/DW heat exchanger and one standby CW/DW heat exchanger

The Type III cooling system employswhat configuration?

2 SW/DW heat exchangers of the same design

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

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.

Flow regulators.

It is used to provide a constant flowof coolant through the system.

Expansion tank.

It is used to provide a constant flowof coolant through the system.

Seawater strainer.

It is used in the seawater coolingsystem to remove debris and sea life,which could clog the pressure and flowcontrol devices.

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.

Circulating pump.

It is used to circulate secondarydistilled water.

Demineralize.

It maintains the secondary coolingsystem’s purity.

An oxygen analyzer is used tomeasure the amount of dissolvedoxygen in the liquid coolingsystem. The presence of oxygencauses oxidation within the coolingsystem.

True

When inspecting a telltale drain,you discover that it is leaking.What failure does it indicate?

The tube joint

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

What is the symbol for temperaturegradient?

^T

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

Who is the best qualified person onboard to determine the overallcondition of the cooling system?

Engineering officer

The expansion tank sight glassshould normally read in what range?

2/3 to 4/5 full

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

What term best describes the wordmakeup water?

Distilled water

When, if ever, may potable water beused in electronic cooling systems?

Never

What is the maximum permissiblechloride that may be used in cooling system water?

.065 epm

What is an indication that theduplex strainer is clogged?

The pressure reading will reading will be 5 to 10 psi above the clean basket

If the pressure drop is less thanthat of a clean basket reading, thebasket may be missing.

True

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

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

Temperature regulating valvecorrective maintenance consistsonly of visual checks for leaks andcorrosion.

False

Which of the following devices isused to regulate flow in a seawatercooling system?

The orifice plate

Which of the following flowregulators is used to regulate flowin the chilled water system?

The variable orifice

Which of the following deviceswould be used to protect a coolingsystem from over pressurization?

The equipment-flow regulator

What is the function of a typicallow-flow switch?

To indicate low coolant flow

In a venturi-type flowmeter, theflow rate is measured by whatprocess?

The pressure differential between the two caps

Which of the following flowmetersallows visual inspection of thecoolant for entrained air?

The rotameter-type

Operating a circulating pump withinsufficient coolant flow couldcause which of the followingmalfunctions?

The overheating of the pump and the seizure of the pump

What percent of the coolant flowsthrough the demineralizer in onehour?

5%

Which of the followingdemineralizer components is used toremove small particles from thecoolant?

The submicron filter

Which of the followingcontaminations is least likely tooccur in a distilled water andethylene glycol coolant system?

Bacterial

Demineralize performance andcoolant purity is monitored bymeasuring what property of thecoolant?

Conductivity

Scheduled maintenance of ademineralizer consists primarily ofperforming what preventive action?

Replace the filters and cartridges

Which of the following contaminatescould be considered a source ofcontamination for an oxygenanalyzer sensor?

Oil from your fingers

What position on an alarmswitchboard is used for alarmacknowledgement?

Standby

What position on an alarmswitchboard is used to simulate analarm position?

Test

What is the first step in isolatingthe extent of waveguide flooding?

Secure the cooling system

Dew point is best defined by whichof the following statements?

Temperature at which the vapor begins to deposit as a liquid

Compressing air has what effect, ifany, on relative humidity?

It will increase

Type I dehydrator.

Uses freezing ONLY to dry the air

Type II dehydrator.

Uses adsorption ONLY to dry the air

Type III dehydrator.

Uses a combination of refrigeration and desiccant to dry the air

Air compressor.

Compresses the air

What is the normal mode ofoperation of an equipment airdryer?

By-pass

Oil vapor is removed from thecompressed air by which of thefollowing methods?

By fluid separation

It contains a desiccant chambers todry the air.

dehydrator

It controls inlet air to thedehydrator.

pressure regulator

It uses centrifugal force toextract droplets of liquid.

fluid separator

It uses absorption to remove oilvapor.

fluid seperator

It provides the input to thepressure regulator.

telltale oil filter

It discharges oil and water througha muffler.

telltale oil filter