Question
3081
Tangki harian (service tank) digunakan untuk…
A thermostat helps energy efficiency because it…
Options
a
Menyimpan bahan bakar yang akan digunakan oleh mesin
Prevents the compressor from running continuously once the room temperature has been reached.
b
Mengurangi kadar air dalam bahan bakar sebelum digunakan
Raises discharge pressure so that the condenser cools more quickly.
c
Membuang sisa bahan bakar yang tidak digunakan
Increases refrigerant flow to the evaporator without limit.
d
Mengendapkan kotoran dalam bahan bakar
Increases electric motor current during starting.
Grade
Ungraded
Last Update
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Question
3082
Pada saat kapal melakukan manuver, bahan bakar yang digunakan biasanya berasal dari…
The main function of an evaporator is to…
Options
a
Tangki harian diesel oil (DO)
Absorb heat from the air or product being cooled.
b
Storage tank
Reject refrigerant heat to seawater.
c
Settling tank
Raise refrigerant vapour pressure before compression.
d
Mixing tank
Store reserve liquid refrigerant during dry-docking.
Grade
Ungraded
Last Update
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Question
3083
Mixing tank dalam sistem bahan bakar berfungsi untuk…
In a forced-draught evaporator, heat transfer is assisted by…
Options
a
Mencampur bahan bakar sisa yang keluar dari main engine agar tidak terbuang
A fan that moves air across the coil surface.
b
Memisahkan air dari bahan bakar sebelum digunakan
A seawater pump that sprays the refrigerated space.
c
Meningkatkan tekanan bahan bakar sebelum masuk ke injector
A safety valve that opens periodically.
d
Mengurangi kandungan sulfur dalam bahan bakar
An electric heater that operates continuously.
Grade
Ungraded
Last Update
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Question
3084
Flowmeter digunakan dalam sistem suplai bahan bakar untuk…
Excessive frost formation on the evaporator can cause…
Options
a
Mengetahui jumlah bahan bakar yang dipakai oleh mesin
Resistance to heat transfer and reduced cooling capacity.
b
Meningkatkan tekanan bahan bakar sebelum masuk ke ruang bakar
A significant increase in cooling capacity.
c
Mengurangi viskositas bahan bakar sebelum dipanaskan
Discharge pressure to fall below normal.
d
Memisahkan air dari bahan bakar sebelum digunakan
The liquid receiver to fill rapidly with lubricating oil.
Grade
Ungraded
Last Update
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Question
3085
Tangki harian biasanya memiliki kapasitas yang cukup untuk…
The purpose of the defrost process on the evaporator is to…
Options
a
8 hingga 12 jam operasional mesin
Remove frost so that heat transfer becomes effective again.
b
24 jam operasional kapal
Reduce condensing pressure to zero.
c
48 jam perjalanan laut
Empty all refrigerant from the system.
d
72 jam pemakaian bahan bakar
Increase humidity in the refrigerated space.
Grade
Ungraded
Last Update
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Question
3086
Bahan bakar di kapal disimpan di…
One common defrost method used in shipboard refrigeration installations is…
Options
a
Storage tank
Electric heater or hot gas defrost.
b
Settling tank
Cooling ballast water through the evaporator.
c
Service tank
Circulating lubricating oil into the cold room.
d
Bunker tank
Charging compressed air into the suction line.
Grade
Ungraded
Last Update
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By -
Question
3087
Berapa kisaran suhu yang dipertahankan oleh koil pemanas pada tangki settling bunker MFO?
A heater on the evaporator drain line is installed to…
Options
a
60 – 70 ºC
Prevent meltwater from freezing and blocking the drain line.
b
40 – 50 ºC
Heat liquid refrigerant before it enters the expansion valve.
c
30 – 40 ºC
Lower the refrigerated space temperature more quickly.
d
70 – 80 ºC
Dry the lubricating oil in the compressor crankcase.
Grade
Ungraded
Last Update
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By -
Question
3088
Sebelum masuk pompa, bahan bakar melewati strainer dengan tujuan…
A crankcase heater on the compressor is useful for…
Options
a
Menyaring kotoran yang terdapat dalam bahan bakar
Preventing refrigerant migration into the crankcase and oil dilution when the compressor is stopped.
b
Meningkatkan tekanan bahan bakar
Raising discharge pressure during peak load.
c
Mendinginkan bahan bakar
Condensing refrigerant before it enters the receiver.
d
Mencampurkan bahan bakar dengan udara
Heating the refrigerated space during defrost.
Grade
Ungraded
Last Update
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By -
Question
3089
Setelah dari settling tank, bahan bakar dipompakan ke Service tank melalui …
A back pressure valve is installed to…
Options
a
Purifier
Maintain a minimum evaporating pressure in a particular evaporator.
b
Storage tank
Purge air from the condenser automatically.
c
Motor induk
Raise refrigerant level in the sight glass.
d
Injection pump
Separate oil from refrigerant on the discharge side.
Grade
Ungraded
Last Update
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By -
Question
3090
Fungsi dari Purifier dalam sistem bahan bakar adalah…
In a system with several evaporators operating at different temperatures, a back pressure valve is useful so that…
Options
a
Membersihkan bahan bakar dari kotoran dan air
The higher-temperature evaporator does not fall to too low a pressure.
b
Meningkatkan suhu bahan bakar sebelum ke mesin
All evaporators operate at the same discharge pressure.
c
Menyimpan bahan bakar sebelum digunakan
The condenser does not require cooling water.
d
Menekan bahan bakar ke ruang bakar
The liquid receiver can replace the thermostat function.
Grade
Ungraded
Last Update
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