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1
What is the primary function of a heat exchanger on a ship?
To transfer heat from one fluid to another
2
Whieh type of heat exchanger is typically used cooling engine lube oil?
Shell and tube
3
Which flow pattern is used in a counterflow heat exchanger?
The hot and cold fluids flow in opposite directions
4
What is the recommended procedure for shutting down a heat exchanger?
Gradually reduce the flow of the hot fluid and then the cold fluid until the heat exchanger comes to a stop
5
What is the recommended practice for monitoring the performance of a heat exchanger?
both A and B
6
How is the effectiveness of a heat exchanger calculated?
By dividing the heat transfer rate by the difference in temperature between the hot and cold fluids
7
What is the recommended temperature range for cold fluids entering a heat exchanger?
80°F-90°F
8
What is fouling in a heat exchanger and how does it affect performance?
Pouling is the buildup of dirt and debris in the heat exchanger, which reduces the efficiency and increases maintenance requirements
9
What is the purpose of pressure relief valves in a heat exchanger system?
To protect against overpressure and prevent damage to the equipment or injuries to personnel
10
How can fouling in a heat exchanger be detected?
By measuring the temperature and pressure drop across the exchanger
11
What are some common symptoms of a corroded heat exchanger?
Leaks, discoloration, and reduced heat transfer
12
What is a possible cause of fluid leakage in a heat exchanger?
Corrosion or erosion of seals and gaskets
13
Whats the role of the automatic salinity controller in a fresh water generator?
To monitor and adjust the salinity of the water being produced
14
What is the purpose of the condenser in a fresh water generator?
To cool and condense the vaporized seawater into fresh water
15
What the process used by a fresh water generator to produce fresh water from sea water?
reverse osmosis
16
What is the main function of a fresh water generator on a ship?
to produce fresh water for drinking and other uses
17
What is the purpose of the preheater in a fresh water generator?
To heat the evaporator used to distil seawater
18
How is the feed water temperature typically controlled in a fresh water generator?
by adjusting the temperature of the jacket water
19
How is the quality of the produced water typically monitored in a fresh water generator?
By measuring the electrical conductivity of the water
20
What is the purpose of monitoring the electrical conductivity of the produced water?
To ensure that the salt content is within acceptable limits
21
What is the purpose of monitoring the differential pressure across the pre-filter?
to ensure that the pre-filter is not clogged or dirty
22
Which of the following is a common cause of reduced output in a fresh water generator?
Low feed water flow rate
23
What is the first step in troubleshooting a fresh water generator that is producing water with a high pH level?
Check the pH of the feed water
24
What is the purpose of monitoring the generator pressure?
to ensure that the generator is operating at the correct pressure
25
What is the typical cause of a generator failure in a fresh water generator?
Clogged pre-filter
26
What is the first step in troubleshooting a fresh water generator that is not producing enough freshwater?
Check the feed water flow rate
27
Why is it important to maintain and clean the evaporator coils in a fresh water generator?
To prevent fouling and scaling that can reduce heat transfer and efficiency
28
How is the quality of the produced water typically monitored in a fresh water generator?
By measuring the electrical conductivity of the water
29
What is the primary purpose of an oily water separator on a ship?
To remove oil and other contaminants from bilge water
30
How does an oily water separator separate oil from water?
Through gravity separation
31
What is the first stage of an oily water separator?
Coalescer
32
What is the purpose of the coalescer in an oily water separator?
To allow oil and water to separate due to the difference in density
33
What is the first step in operating an oily water separator?
Verify that the inlet valve is open
34
What should be done if the oil content monitor indicates that the discharge quality is not within the permissible range?
Stop the oily water separator
35
When should the coalescer element be cleaned or replaced?
When the pressure drop across the coalescer exceeds the specified limit
36
Which type of oily water separator is most effective in removing oil from water?
Coalescing plate type
37
What parameter should be monitored in a gravity type oily water separator?
Oil content
38
Which type of oily water separator is most efficient in handling large volumes of oily water?
Checking the weather forecast
39
What is the primary function of a windlass on a ship?
Raise and lower the ship's anchor
40
What should be done before operating a windlass?
Check the anchor chain for wear
41
What should be done if a deck crane's load moment indicator (LMI) exceeds the allowed limit?
Stop the operation immediately
42
If a winch motor overheats during operation, what should be done?
Shut off the power and wait for the motor to cool
43
What is the purpose of a pre-operational check of a deck crane?
To ensure that the crane is safe to operate
44
If a windlass does not respond to control commands, what could be the cause?
Faulty wiring
45
If a winch fails to lift a load, what could be the cause?
Overloaded wire rope
46
What is the purpose of regular maintenance of deck equipment?
To prevent malfunctions and breakdowns
47
In the automatic control system of cargo-handling equipment, what component is responsible for transmitting signals to the equipment?
sensor
48
If a sensor in the automatic control system of cargohandling equipment is malfunctioning, what effect will it have on the equipment?
It may cause the equipment to operate incorrectly or not at all
49
In the automatic control system of deck machinery, what component is responsible for converting electrical signals to mechanical motion?
actuator