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在线测试： Test for Juniors on the Reefer (CES v6.0)
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An electrical power emergency source on ship is required because:
It satisfies the SOLAS (and other) requirement for the ship safety.
The main diesel generator(s) can be taken out of service for overhaul of repair.
The ship’s total load can be shared between main and emergency generators.
Why is precooling of cargo is important?
Reefer cannot be used to reach the desired temperature, cargo of a reefer container has to be brought to the desired temperature prior to loading.
If no precooling done cargo inside of container can be out of order already.
Its save fuel. After loading onboard, vessel will not spend own fuel to bring temperature on required level.
How does a reefer container work?
The generator, placed on one side of the container, blows air into the container.
Two generators from both side of the container blows air into the container.
What is the reason for the superheat in reefer system?
Low quantity of refrigerant in evaporator.
Too much refrigerant in the system leading to overheat of the compressor.
Which of the following should be used on an electrical fire (2 answers are correct).
回答
Which parameters of the reefer container you should check after loading?
Serial number, stowage position, set point, ventilation position, humidity set point, supply temperature, return temperature, active alarms, visual damages of refrigerated plant.
Serial number, set point, gas level in receiver, compressor current, supply voltage, evaporator temperature, superheat, suction temperature, discharge temperature.
Serial number, stowage position, set point.
How to test dielectric gloves before work?
Before use, the gloves should be inspected, paying attention to the absence of mechanical damage and fill gloves with hot fresh water.
Dielectric gloves do not need to be tested before work, if there is a “test stamp” from manufacturer.
Before use, the gloves should be inspected, paying attention to the absence of mechanical damage, dirt and moisture, and also check for punctures by twisting the gloves towards the fingers.
What is the reason between dry and reefer container?
The major difference between normal dry container and reefer container is that the temperature condition controlling system is available in reefer container.
Difference in types of cargo it loaded.
It is the same, just different names for containers in different countries.
What is Reefer container used for?
Reefers are essential for worldwide trade of food.
Reefers are essential for worldwide trade of food. Storage of the wood.
Storage of food.
What is the superheat in a refrigerated system?
This is the difference between the boiling point temperature of refrigerant in the evaporator coil and the actual temperature of the refrigerant gas as at leave the evaporator.
This is the compressor overheat temperature.
This is the difference between the supply and return temperatures.
According to the requirements of the SOLAS 74 convention, Emergency Diesel Generator (EDG) must take full ratred load no more than:
45 sec.
35 sec.
50 sec.
What is a Reefer Container?
Container is a type of shipping container that remains its cargo at a regulated cool temperature.
Container for Cargo.
Container is a type of shipping container that remains it cargo safe.
Container for transportation of different types of food.
Which of these does not affect the temperature rise of the compressor discharge gases?
Malfunction one of two return air sensors.
Insufficient freon level in the system.
Malfunction of expansion valve.
Compressor malfunction.
What is the first action if you find a reefer container in not working condition?
Check main circuit breaker position (on/off) and the presence of power supply on each incoming phase with multimeter.
Make sure the serviceability of the main transformer.
Verify presence of “freon gas” in the system.
Call service engineer.
What is the correct stowage of the reefer on deck of container vessel?
Motor to forward.
Motor to alt.
On a container vessel, what must be done as soon as reefer containers have been loaded?
It must be connected to the ship power supply and their setting temperature verified.
Stowage position must be reported to the duty officer.
Setting temperatures must be verified.
What is the purpose of the Oil in the refrigerated systems?
To lubricate the moving parts of the compressor.
To help the refrigerant absorb the heat in the process.
To lubricate the TXV as sometimes it works hard to maintain cooling capacity.
To ease the travel of the refrigerated thru the piping.
What is the main signs of an insufficient freon gas level in the refrigerated system that we can easily see on the evaporator coil?
The evaporator coil is frozen after the thermostatic valve at the beginning of the coil.
Insufficient level of freon does not affect the evaporator coil.
The evaporator coil is frozen after the thermostatic valve at the end of the coil.
The pipe before the thermostatic valve is frozen but the evaporator coil is clean.
Based on pressure measurements, how to determine that the compressor is out of order?
The suction pressure is less than the discharge pressure.
The suction pressure equal to discharge pressure.
The suction pressure greater than the discharge pressure.
Compressor failure will not affect to the system pressure.
What is the normal suction pressure for compressor?
Depend on the reefer container working mode and ambient temperature. Technical standards from the manufacturer that are specified in manual.
Depend on the freon gas level in receiver.
No more than 5 bar.
Not less than 5 bar.
What is means “Ambient Temperature”?
Outside temperature.
Maximum possible temperature.
Required temperature for transportation of cargo in reefer container.
How to prepare reefer container system for safely welding work on the gas pipe?
Switch off power supply and collect freon to the recovery balloon.
Switch off power supply and collect freon to receiver.
Switch off power supply and discharge freon to atmosphere.
Disconnect power supply cable and collect freon to the recovery balloon.
What is the function of a thermistor in the winding of an evaporator fan electric motor?
Interrupt the operation of the electric motor in case of overheating.
Reads the motor current.
Measures the temperature of the electric motor in case of overheating.
Designed to start the electric motor. It serves to maintain the current on the auxiliary winding of the motor and goes into a shutdown state when the motor is running.
How will a faulty capacitor of a single phase electrical motor affect its operation?
Motor will not start.
Motor will start and stop periodically.
The insulation resistance of the motor will decrease.
The electric motor of condenser fan will burn out on start.
What is means “Set Point”?
Required temperature for transportation of cargo in reefer container.
Port of destination.
Required temperature of Chief Officer/Planner.
The test for juniors covers both theoretical and practical knowledge about safely working with electrical equipment. Mastery of this material directly reflects the competence of an employee in a relevant position on a vessel. A sailor on a refrigerated cargo ship is tasked with maintaining and monitoring the refrigeration systems to ensure that the required temperature conditions for the transported goods are consistently met. They are also responsible for overseeing the condition of the equipment, performing necessary maintenance, and addressing any issues with the cooling system that may arise during the voyage. This role demands strong technical problem-solving abilities and strict compliance with safety regulations and procedures.
- Version: 6.0.0.
- Test type: STCW.
- Duty: Junior Specialist.
- Vessel type: Reefer.
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