Question
1141
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
1142
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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Question
1143
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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Question
1144
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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Question
1145
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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Question
1146
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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Question
1147
Bahan bakar yang sudah melewati centrifuge akan disimpan di…
A Low Pressure Cut Out operates to…
Options
a
Service tank
Stop the compressor if suction pressure falls below the safe limit.
b
Storage tank
Stop the seawater pump if discharge pressure rises.
c
Settling tank
Open a bypass line when the receiver is full.
d
Venting box
Increase refrigerant flow when the space becomes too warm.
Grade
Ungraded
Last Update
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Question
1148
Tekanan bahan bakar yang masuk ke Injection Pump harus sebesar…
In a pump-down system, the Low Pressure Cut Out is used to…
Options
a
7-8 bar
Stop the compressor after the low side refrigerant has been pumped down to the set pressure.
b
4-5 bar
Open the condenser so that heat is rejected quickly.
c
10-12 bar
Add refrigerant charge when the load increases.
d
15-20 bar
Adjust the expansion valve opening manually.
Grade
Ungraded
Last Update
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By -
Question
1149
Fungsi dari venting box dalam sistem bahan bakar adalah…
If the Low Pressure Cut Out fails to operate, the danger that may occur is…
Options
a
Membebaskan gas atau udara yang terdapat dalam bahan bakar
The compressor continues running at excessively low suction pressure and may be damaged.
b
Meningkatkan tekanan bahan bakar sebelum masuk ke mesin
The condenser immediately leaks because the pressure is too high.
c
Meningkatkan suhu bahan bakar sebelum digunakan
The evaporator becomes too hot due to excess refrigerant.
d
Menyaring bahan bakar dari kotoran dan air
The liquid receiver loses its entire charge to open air.
Grade
Ungraded
Last Update
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Question
1150
Pada sistem bahan bakar, circulating pump berfungsi untuk…
A High Pressure Cut Out functions to…
Options
a
Memompa bahan bakar melewati heater dan filter sebelum masuk ke mesin
Stop the compressor if discharge pressure or condensing pressure becomes too high.
b
Menyimpan bahan bakar dalam jumlah besar sebelum digunakan
Stop the compressor if room temperature becomes too low.
c
Menyaring bahan bakar sebelum masuk ke injection pump
Increase cooling water flow to the condenser automatically.
d
Mendinginkan bahan bakar sebelum masuk ke mesin
Replenish lost lubricating oil.
Grade
Ungraded
Last Update
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