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NAVEDTRA 14093
ELECTRONICS TECHNICIAN VOLUME 08
SUPPORT SYSTEMS
CHAPTER 1
NAVEDTRA 14093
ELECTRONICS TECHNICIAN VOLUME 08
SUPPORT SYSTEMS
CHAPTER 1
Three of the four methods of
cooling are forced-air, air-to-air,
air-to-liquid. What is the fourth?
1. Circulation
2. Convention
3. Conversion
4. Convection
When utilizing forced-air cooling,
an air filter must be provided at
the air outlet to remove dust and
dirt from the exhaust air. TRUE OR FALSE?
1. True
2. False
Heat is removed from the air
passing by the heat producing
source in an air-to-air cooling
system by forcing it through what
component?
1. Blower
2. RF filter
3. Heat exchanger
4. Fins
Efficiency is increased in an airto-
liquid cooling system by the use
of what system component?
1. Liquid heat exchangers
2. Dual blower motors
3. Larger supply lines
4. Duplex strainers
What number of basic cooling
systems make up a typical liquid
cooling system?
1. One
2. Two
3. Three
4. Four
The secondary cooling system
transfers the heat load from the
electronic equipment to the primary
system. TRUE OR FALSE?
1. True
2. False
The Navy uses what number of basic
configurations of liquid cooling
systems?
1. One
2. Two
3. Three
4. Four
Which of the following water
resources is/are used for primary
cooling?
1. Seawater only
2. Chilled water only
3. Seawater and chilled water
4. Potable water and seawater
The cooling water for the primary
cooling system is either seawater
or chilled water. The seawater is
from the sea and the chilled water
is from what source?
1. The liquid cooling system
2. The ship’s air conditioning
plant
3. The ship’s firemain system
4. The reefer deck supply system
When temperature range is
considered to be critical, what
type of cooling system would most
likely satisfy this need?
1. Type I
2. Type II
3. Type III
4. Type IV
What type of liquid cooling system
can satisfactorily be operated when
seawater temperatures reach 95°F?
1. Type I
2. Type II
3. Type III
4. Type IV
In a primary cooling system, flow
regulator may be known by what
other term?
1. Expansion tank
2. Demineralizer
3. Gate valve
4. Orifice plate
Open looped seawater systems are
also called one-pass because the
seawater flows through the system
only once. TRUE OR FALSE?
1. True
2. False
Secondary cooling systems are which
of the following types?
1. Open-loop only
2. Closed-loop only
3. Both 1 and 2 above
4. One-pass
Type I cooling systems employ what
type of configuration?
1. 2 SW/DW HE of the same design
2. 2 CW/DW HE of the same design
3. 1 CW/DW HE and 1 standby CW/DW HE
4. 1 SW/DW HE and 1 standby CW/DW HE
An expansion tank is installed in
what system to compensate for
changes in coolant volume?
1. The seawater
2. The potable water
3. The distilled water
4. The chilled water
What term best describes a
expansion tank that is located
above the highest point in the
secondary system and vented to the
atmosphere?
1. Pressure tank
2. Compression tank
3. Freefall tank
4. Gravity tank
What term best describes an
expansion tank that requires an air
charge on the tank and is located
below the highest point in the
secondary cooling system?
1. Pressure tank
2. Compression tank
3. Freefall tank
4. Gravity tank
What definition best describes the
word submicron?
1. Less than one millionth of a
meter
2. Equal to one millionth of a
meter
3. Greater than one millionth of a
meter
4. Equal to one meter
The Type II cooling system employs
what configuration?
1. 2 SW/DW HE of the same design
2. 2 CW/DW HE of the same design
3. 1 CW/DW HE and 1 standby CW/DW HE
4. 1 SW/DW HE and 1 standby CW/DW HE
The Type III cooling system employs
what configuration?
1. 2 SW/DW HE of the same design
2. 2 CW/DW HE of the same design
3. 1 CW/DW HE and 1 standby CW/DW HE
4. 1 SW/DW HE and 1 standby CW/DW HE
In a Type III cooling system, the
two-way temperature regulating
valve is used instead of a threeway
valve to regulate the
temperature in what system
component(s)?
1. The primary loop
2. The secondary loop
3. The heat exchangers
4. The circulating pumps
Define a Heat Exchanger.
It is constructed to be shell-type and
tube-type in which the secondary
coolant flows through the shell, while
the primary coolant flows through the
tubes.
Define Flow regulators.
It is used to provide a constant flow
of coolant through the system.
Define Expansion tank.
It maintains a positive pressure on
the circulating pump inlet,
compensates for changes in the coolant
volume and it vents air from the
system.
Define Seawater strainer.
It is used in the seawater cooling
system to remove debris and sea life,
which could clog the pressure and flow
control devices.
Define temperature regulating valve.
It regulates the amount of cooling
water flowing through or bypassing a
heat exchanger to maintain a desired
temperature of distilled water going
to the electronic equipment.
Define Circulating pump.
It is used to circulate secondary
distilled water.
Define Demineralizer.
It maintains the secondary cooling
system’s purity.
An oxygen analyzer is used to
measure the amount of dissolved
oxygen in the liquid cooling
system. The presence of oxygen
causes oxidation within the cooling
system.
1. True
2. False
When inspecting a telltale drain,
you discover that it is leaking.
What failure does it indicate?
1. The seawater strainer
2. The bypass fins
3. The tube joint
4. The circulating pump
The overall effectiveness of the
heat exchanger is determined by
comparing the primary inlet
temperature to its outlet pressure.
The result of this comparison is
best described by what term?
1. Temperature variable
2. Temperature difference
3. Temperature gradient
4. Temperature coefficient
What is the symbol for temperature
gradient?
1. #T
2. %T
3. _ T
4. ±T
The device that is inserted in the
heat exchanger’s water box to
concentrate electrolytic action to
it vice to the metal of the heat
exchanger’s tubes is made of what
material (s)?
1. Zinc cathode
2. Zincs only
3. Zinc anode only
4. Both 2 and 3 above
Who is the best qualified person on
board to determine the overall
condition of the cooling system?
1. Engineering officer
2. Electronics material officer
3. System’s test officer
4. Ship’s maintenance technician
The expansion tank sight glass
should normally read in what range?
1. 1/4 to 1/2 full
2. 1/3 to 2/3 full
3. 1/2 to 3/4 full
4. 2/3 to 4/5 full
The low-level alarm switch is
usually set at 20 percent of tank
capacity. The alarm will initially
sound when the distilled water
level reaches which of the
following levels?
1. 5 percent of full
2. 10 percent of full
3. 15 percent of full
4. 20 percent of full
What term best describes the word
makeup water?
1. Distilled water
2. Seawater
3. Potable water
4. Chilled water
When, if ever, may potable water be
used in electronic cooling systems?
1. After chloride is added
2. Only as makeup water
3. As a replacement for chilled
water
4. NEVER
What is the maximum permissible
chloride that may be used in
cooling system water?
1. 6.5 epm
2. 0.65 epm
3. 0.065 epm
4. 0.0065 epm
What is an indication that the
duplex strainer is clogged?
1. The pressure reading will be 5-10
psi below a clean basket reading
2. The pressure reading will be 5-10
psi above the clean basket reading
3. The water temperature will be 5-10
degree below normal
4. The water temperature will be 5-10
degree above normal
If the pressure drop is less than
that of a clean basket reading, the
basket may be missing.
1. True
2. False
The three-way temperature
regulating valve is used where
seawater is the primary cooling
medium, and the two-way valve is
used where chilled water is the
primary cooling medium.
1. True
2. False
The basic operation of both the
two-way temperature regulating
valve is the same as the three-way
temperature regulating valve except
that the two-way valve has a manual
override feature.
1. True
2. False
Temperature regulating valve
corrective maintenance consists
only of visual checks for leaks and
corrosion.
1. True
2. False
Which of the following devices is
used to regulate flow in a seawater
cooling system?
1. The gate valve
2. The globe valve
3. The orifice plate
4. The relief valve
Which of the following flow
regulators is used to regulate flow
in the chilled water system?
1. The globe valve
2. The orifice plate
3. The variable orifice
4. The equipment-flow regulator
Which of the following devices
would be used to protect a cooling
system from over pressurization?
1. The variable orifice
2. The pressure regulator
3. The equipment-flow regulator
4. The relief valve
What is the function of a typical
low-flow switch?
1. To indicate low coolant flow
2. . To indicate excessive coolant
flow
3. To redirect coolant flow to
another load
4. To control coolant flow through
the heat exchangers
In a venturi-type flowmeter, the
flow rate is measured by what
process?
1. The pressure differential
between the two taps
2. The decreased coolant velocity
3. The turbulence of the coolant
4. The diameter of the throat
Which of the following flowmeters
allows visual inspection of the
coolant for entrained air?
1. The orifice-type
2. The venturi-type
3. The purity-type
4. The rotameter-type
Operating a circulating pump with
insufficient coolant flow could
cause which of the following
malfunctions?
1. The overheating of the pump
only
2. The seizure of the pump only
3. Both 1 and 2 above
4. The reduction of outlet
pressure
What percent of the coolant flows
through the demineralizer in one
hour?
1. 100%
2. 50%
3. 20%
4. 5%
Which of the following
demineralizer components is used to
remove small particles from the
coolant?
1. The mixed-bed cartridge
2. The organic cartridge
3. The oxygen removal cartridge
4. The submicron filter
Which of the following
contaminations is least likely to
occur in a distilled water and
ethylene glycol coolant system?
1. Dissolved oxygen
2. Chlorine
3. Oxidized metal
4. Bacterial
Demineralize performance and
coolant purity is monitored by
measuring what property of the
coolant?
1. Temperature compensation
2. Conductivity
3. Pressure differential
4. Resistivity
Scheduled maintenance of a
demineralizer consists primarily of
performing what preventive action?
1. Adjusting the coolant flow
through the system
2. Replacing the purity monitors
3. Replacing the filters and
cartridges
4. Calibrating the purity monitors
Which of the following contaminates
could be considered a source of
contamination for an oxygen
analyzer sensor?
1. Electrolyte
2. Oil from your fingers
3. Direct sunlight
4. Fluorescent lighting
What position on an alarm
switchboard is used for alarm
acknowledgement?
1. Normal
2. Standby
3. cutout
4. Test
What position on an alarm
switchboard is used to simulate an
alarm position?
1. Normal
2. Standby
3. Cutout
4. Test
What is the first step in isolating
the extent of waveguide flooding?
1. Secure the cooling system
2. Estimate the amount of coolant
lost
3. Secure the dry air system
4. Open the lowest point in the
waveguide